Drag the labels to identify the correct sequence in the activation of natural killer cells and how they kill their cellular targets. Reset Help Secretion Perfor Recognition and Adhesion Realignment of Golgi apparatus ut Lys of norma C We for AD Next

The transcription factor attaches to the TATA box, and this complex then entices additional transcription factors including those attached to enhancers to the promoter region.

The three sequential phases of eukaryotic transcription initiation, elongation, and termination are carried out in the cell's nucleus. Transcriptional factors are necessary for eukaryotes because they must first attach to the promoter area and then aid in the recruitment of the proper polymerase.

RNA polymerase must connect to a DNA sequence upstream of a gene in eukaryotes in order to start transcription, much like in prokaryotic organisms.

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Enzymatic activity is affected by pH and temperature. A) a- 6 pH. b- affect the whole molecule structure, and the proteins functions. B) a- 45ºC. b- The enzyme denaturalizes and its functions are affected.

Enzymes, like all proteins, are polypeptidic molecules. They need to get an accurate tridimensional structure to accomplish their functions. There is a limited temperature and pH level at which they lose that structure and denaturalize.

The most accurate configuration for the best catalytic performance depends on the charge of the lateral chains and the environmental pH.

Enzymes have ionizable chemical groups in the side chains of their amino acids. Depending on the environmental pH, these groups will have a positive, negative, or neutral charge. There is an optimum pH level at which enzymes get the best configuration to accomplish their functions.

Most enzymes are sensitive to any change in pH, which might drastically affect their activity. So every enzyme has its optimum pH level, and any slight deviations will cause the enzyme denaturalization, hence, its activity loss.

In general, the increase in temperature accelerates chemical reactions.

The temperature at which the enzymatic activity is the highest is known as the optimum temperature.

⇒ When the environmental temperature is lower than the optimum, there is a slow enzymatic activity.

⇒ When the temperature exceeds the optimum point, the enzymatic activity sharply decreases. It denaturalizes the enzyme. Over this level, the reaction velocity is counteracted by the loss of the catalytic activity due to denaturalization. Enzymatic activity decreases until it completely annulates.

Graph A:

a) pH optimum: 6 aproximately.

b) Outside the pH optimum, the enzyme does not function because the lower or higher levels of pH affect side chains by changing the ionized state of amino acids, which alter the bonds that keep the stable molecule structure. Under these situations, the molecule loses its functions.

Graph B:

a) Optimum temperature: 45ºC aproximately.

b) At extreme temperatures the enzyme denaturalizes and the molecule does not get to accomplish its functions.

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The structure labeled "9" in the accompanying figure is a semilunar valve.

It is a one-way valve that is part of the cardiovascular system. Its function is to keep the blood flowing in one direction and prevent it from flowing backwards. It is composed of three cusps or flaps that are located at the entrance and exit of the pulmonary artery and the aorta. When the left ventricle contracts, the pressure in it rises and the cusps of the semilunar valve open, allowing the blood to be forced into the pulmonary artery and the aorta. As the ventricle relaxes and the pressure drops, the cusps close, preventing the blood from flowing back into the ventricle.

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Assuming that the trait is inherited in an autosomal dominant pattern, where a single copy of the mutated gene is sufficient to cause the trait, the probability of having an affected offspring is 50%.

An offspring is a term used to refer to the young of an animal or plant, produced either sexually or asexually. In sexually reproducing organisms, an offspring is the result of the fusion of genetic material from a male and a female parent, which gives rise to a new individual with a unique combination of genetic traits.

Offspring can vary in number, depending on the species and the reproductive strategy involved. For example, some animals, such as reptiles and birds, lay eggs containing one or more offspring, while others, such as mammals, give birth to live young.

Offspring play an important role in the continuation of a species, as they carry the genetic information that is passed on to future generations. The survival and growth of offspring are influenced by various factors, such as genetics, environmental conditions, and parental care.

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The double-chromatid Stage of homologous pairs of chromosomes cross across and often swap chromosomal segments during prophase of meiosis I.

By enabling genes from each parent to mingle, this recombination generates genetic variety by resulting in chromosomes with various genetic compositions. The nuclear envelope degrades during prophase I. Chromosomes are formed by the chromatin compacting. The two chromatid-containing homologous chromosomes unite to generate tetrads by connecting at their centromeres (2n 4c).

This is when genetic diversity is produced by "crossing over." Only sister chromatids are still present after meiosis II, and homologous chromosomes have been transferred to other cells. Increasing genetic variety is the goal of crossing over, in case you forgot. Meiosis specifically produces novel genetic material combinations in each of the four daughter cells.

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Correct Question:

Events take place that contribute to genetic diversity during which stages of meiosis?

The phosphotases belong to Class 3 according to the Enzyme Commission (EC) classification. The classes are numbered from 1 to 6 and phosphotases fall under .

According to the Enzyme Commission classification, the phosphatases belong to Class 3. This is because Class 3 enzymes are hydrolases which act on ester bonds. Phosphatases act on ester bonds between a phosphate group and another group (such as an alcohol or protein), resulting in the removal of a phosphate group from the molecule.

Phosphatases are enzymes that catalyze the removal of a phosphate group from a molecule. This group of enzymes is critical for regulating numerous cellular processes, including signal transduction pathways, DNA and RNA synthesis, and energy metabolism.

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Yes, when there is a genotype consisting of a dominant and a recessive allele, the phenotype is generally the same as the dominant allele.

This is because the dominant allele has a greater effect on the phenotype than the recessive allele, and it is the trait that is expressed when both alleles are present. For example, if the genotype is heterozygous for the trait of eye color, the phenotype will usually look like the dominant eye color (e.g. blue) rather than the recessive one (e.g. brown). This is because the dominant allele is what is expressed when the two alleles are present in the same genotype. In some cases, however, both alleles can be expressed, resulting in a blended phenotype. In conclusion, when there is a genotype that consists of a dominant and a recessive allele, the phenotype generally looks like the dominant one.

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This statement refers to two different types of behavior in behaviorism: operant behavior and respondent behavior.

What is an operant behavior?

Operant behavior, also known as "instrumental conditioning," refers to behavior that produces events in the environment. It is controlled by the consequences that follow it, such as rewards or punishments, and is shaped by reinforcement and punishment contingencies. Examples of operant behavior include pressing a lever to receive food or studying to obtain good grades.

What is respondent behavior?

On the other hand, respondent behavior, also known as "classical conditioning," occurs as an automatic response to a stimulus. It is reflexive and is elicited by a specific antecedent stimulus, without the need for learning. Examples of respondent behavior include salivating at the sight or smell of food, or blinking in response to a puff of air.

In summary, operant behavior produces events in the environment, whereas respondent behavior occurs as an automatic response to a stimulus.

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Complete question is: behavior produces events in the environment,  "behaviorism" respondent behavior occurs as an automatic response to a stimulus

Linda's unborn child is in the germinal period of prenatal development, which begins with fertilization and ends when the zygote implants itself into the uterine lining. Here option A is the correct answer.

During the germinal period, the zygote undergoes a series of cell divisions, forming a ball of cells called a blastocyst. The blastocyst then travels through the fallopian tube and eventually implants itself into the lining of the uterus, where it will continue to develop into an embryo. The umbilical cord and amniotic sac are formed later during embryonic development.

The implantation of the blastocyst is a crucial step in fetal development, as it allows the embryo to access nutrients and oxygen from the mother's bloodstream. If implantation does not occur properly, it can result in a failed pregnancy. Therefore, it is important for the blastocyst to implant itself in the right place at the right time, which typically occurs within 6-10 days after fertilization.

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The reason water takes so long to heat up and cool down is due to its relatively high specific heat capacity. Specific heat capacity is defined as the amount of heat energy required to raise the temperature of one unit mass of a substance by one degree Celsius.

Water has a very high specific heat capacity compared to many other substances, which means that it requires a large amount of heat energy to raise its temperature even by a small amount. This is why water takes longer to heat up compared to other materials with lower specific heat capacities, such as metals.

Similarly, water also takes a longer time to cool down because it requires a significant amount of heat energy to be removed in order for its temperature to drop. This is why it can take a while for the water to cool down to room temperature even after being heated.

The high specific heat capacity of water is important for many biological and environmental processes. For example, it helps to regulate the temperature of the human body and other living organisms, and it can also moderate temperature changes in aquatic environments.

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Answer:centrioles

Explanation:

Animal cell centrosomes contain two centrioles, which can also serve as the basis of cilia and flagella, and organise microtubules.

Centrosomes, cilia, and flagella are all formed from the microtubule-based cylindrical organelles known as centrioles/basal bodies (CBBs). The three ancestral structures—CBBs, cilia, and flagella—are found in all significant eukaryotic taxa.

Animal cells' cytoplasm contains a pair of barrel-shaped organelles called centrioles that are close to the nuclear envelope. The skeletal framework of the cell, the microtubules, are organised by centrioles. They aid in pinpointing where the cell's nucleus and other organelles are located.

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Evolution- The process of evolution in populations over time that makes descendants different from their ancestors. Two types- Microevolution- Evolution can occur on a genetic level, affecting a species population. Macroevolution- Evolution on a genetic level affecting changes in traits across population.

Species is a classification of biological organisms, usually based on common characteristics. Traits, on the other hand, are individual characteristics of an organism. A species can have many different traits, but all individuals belonging to that species will share certain common characteristics that differentiate them from other species.

Charles Darwin

- English Naturalist

- Went on a voyage to the Galapagos Islands.

- Saw that varieties of finches, tortoises, and other animals lived on different islands and had specific adaptations for that island

- Developed his theory of Natural Selection to serve as the mechanism for how Evolution occurs.

Natural selection- Organisms with a "heritable" traits (adaptations) will live longer and reproduce more than others, causing changes in the population over time by acting on the traits that are beneficial.

- Survival of the Fittest.

- Fitness- A measure of how well you can adapt in your environment.

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Cystic fibrosis is an autosomal recessive disorder.

Cystic fibrosis (CF) is an inherited genetic disorder that affects the lungs, pancreas, and other organs. It is caused by mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene, which is located on chromosome 7. The CFTR gene provides instructions for making a protein that regulates the movement of salt and water in and out of cells in the body. CF is inherited in an autosomal recessive pattern, which means that a person must inherit two copies of the mutated CFTR gene, one from each parent, to develop the condition. If a person inherits only one mutated CFTR gene, they are a carrier of the condition but do not have symptoms. If two carriers have a child, there is a 25% chance that the child will inherit two mutated CFTR genes and develop CF. Autosomal recessive disorders are inherited when both parents carry one copy of a mutated gene, but do not have symptoms of the disorder. In this case, there is a 25% chance that their offspring will inherit two copies of the mutated gene and develop the disorder. Since CF is inherited in an autosomal recessive pattern, it means that a child can only develop the condition if both parents are carriers or have the condition themselves.

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The statement is true that phasic and sustained skeletal muscle contraction on extravascular compression of blood vessels and on venous pressure express contrast.

Sustained contractions are long-lasting contractions that happen continually, while phasic contractions are brief contractions that happen sporadically. Extravascular compression can seriously impair muscle blood flow during hard muscular contractions, particularly during prolonged tetanic contractions.

Blood is expelled from the venous vasculature by extravascular compression, which also prevents blood from entering the artery vasculature. The combined result of these forces is increased muscle perfusion.

Changes in abdominal pressure during muscular contraction and variations in intrathoracic pressure during respiration both have an impact on central venous pressure (CVP). Intrathoracic pressure falls during inspiration as CVP rises.

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Carbohydrates, lipids, and protein have potential energy, and can be used in aerobic respiration to generate .

Carbohydrate- A carbohydrate is a naturally occurring substance or a derivative of one, made composed of molecules of carbon, hydrogen, and oxygen. The most prevalent organic compound is a carbohydrate, and all life depends on them.

Lipids- Fatty, waxy, or oily molecules are referred to as lipids. They are soluble in organic solvents but insoluble in polar solvents like water.

Amino acids: Amino acids can be used to generate ATP in aerobic respiration as well. They are broken down into intermediates that can enter the Krebs cycle to generate ATP.

Protein- Large, intricate molecules known as proteins serve a variety of vital functions in the body. They are crucial for the construction, operation, and control of the body's tissues and organs and carry out the majority of their job inside cells

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The following question may be like this:

Select all the molecules that have stored potential energy and that can be used in aerobic respiration to generate atp.

a) lipids carbohydrates

b) water proteins

c) carbon dioxide

Megafauna refers to large-bodied animals, typically those that weigh over 100 pounds. North America was home to an array of megafauna that roamed the continent during the Ice Age, which lasted from 2.6 million years ago to about 11,700 years ago.

## The Rise of Megafauna in North America

During the late Pliocene Epoch, around 3 million years ago, the formation of the Isthmus of Panama allowed animals to cross from South America to North America. This event, known as the Great American Biotic Interchange, led to the appearance of various species of megafauna in North America. These included mammoths, mastodons, saber-toothed cats, giant beavers, and dire wolves.

## The Role of the Environment

The megafauna of North America evolved to adapt to the harsh environment of the Ice Age. The continent was covered in extensive grasslands, and megafauna grazed on these grasses. The large size of the animals allowed them to store more food in their bodies, which was necessary to survive through the long, cold winters.

However, at the end of the Ice Age, the climate began to warm up, and the grasslands began to shrink. The disappearance of the grasslands meant that the megafauna could no longer find enough food to sustain themselves. Additionally, human populations were growing, and they began hunting megafauna for food and other resources.

## The Fall of Megafauna in North America

The decline of the megafauna in North America was a slow process that began around 13,000 years ago and continued until about 10,000 years ago. Many species of megafauna, such as mammoths and mastodons, went extinct, while others, such as bison and elk, managed to survive.

## Connection to the Current State of the World

The extinction of the megafauna of North America had a profound impact on the ecosystem of the continent. The disappearance of large herbivores like mammoths and mastodons meant that the grasslands were no longer maintained. This led to the growth of forests, which changed the landscape of North America.

The decline of the megafauna in North America serves as an example of how environmental changes and human activities can have a significant impact on ecosystems. Today, we are facing a similar situation with the current climate crisis and the loss of biodiversity. It is essential to understand the past to create a better future for our planet.

Sure, here you go!

The rise and fall of the megafauna of North America can be described in evolutionary terms, considering the interplay between organisms and their environment. Megafauna refers to large-bodied animal species that existed during the Pleistocene epoch, which lasted from about 2.6 million to 11,700 years ago.

During the Pleistocene, North America was home to a diverse range of megafauna, including mammoths, mastodons, giant sloths, saber-toothed cats, and many others. These large animals had evolved over millions of years, adapting to the unique environmental conditions of that time.

The Pleistocene was characterized by frequent climate fluctuations, with repeated glaciations and interglacial periods. These climatic shifts influenced the availability and distribution of resources, such as vegetation and water sources, which in turn affected the megafauna populations. As the environment changed, the megafauna species had to adapt to survive.

Many megafauna species possessed specific adaptations that allowed them to thrive in the Pleistocene environment. For example, mammoths and mastodons had long, curved tusks and specialized teeth for grazing on grasses and other vegetation. These adaptations helped them exploit available food resources efficiently. Other megafauna species developed unique traits, such as the large size and strength of the giant ground sloths or the saber-toothed cats' elongated canine teeth for hunting.

However, around 11,700 years ago, the megafauna of North America underwent a rapid decline and eventual extinction. The exact causes of this extinction event are still debated among scientists, but a combination of factors likely contributed. These factors include climate change, overhunting by human populations, changing vegetation patterns, and the loss of habitat due to expanding ice sheets.

The changing climate played a significant role in altering the environment and disrupting ecosystems. The retreat of glaciers led to changes in vegetation and the availability of resources for the megafauna. Additionally, the arrival of humans in North America during this period introduced a new factor in the ecosystem dynamics. Overhunting by human populations could have put significant pressure on the megafauna, especially when combined with other environmental changes.

Drawing a connection to the current state of the world, the rise and fall of the Pleistocene megafauna serve as a reminder of the vulnerability of species in the face of environmental changes and human activities. Today, we are witnessing another period of rapid environmental change, largely driven by human activities such as climate change, habitat destruction, and overexploitation of resources.

The lessons learned from the extinction of the Pleistocene megafauna highlight the importance of conservation and responsible stewardship of the Earth's ecosystems. Understanding the delicate balance between organisms and their environment can help inform our efforts to mitigate the negative impacts of human activities and preserve biodiversity for future generations. By studying the past, we can strive to make more informed choices to ensure the long-term survival of the diverse species that currently inhabit our planet.

The correct answer is C) one that affects the compatibility of male pollen and female reproductive parts. This is because, when two populations are separated by a geographic barrier, a change in the compatibility of male pollen and female reproductive parts would mean that the two populations can no longer mate and reproduce, which would result in speciation.

The most likely gene to result in speciation while a geographic barrier separates two populations of a flowering-plant species is the one that affects the compatibility of male pollen and female reproductive parts. Option C) one that affects the compatibility of male pollen and female reproductive parts is the most likely gene to result in speciation while a geographic barrier separates two populations of a flowering-plant species. Speciation is the evolutionary process through which populations diverge to form new biological species.

It is defined as the process by which populations of the same species become isolated from one another to the point where they can no longer interbreed to produce viable offspring. The gene that affects the compatibility of male pollen and female reproductive parts is the most likely gene to result in speciation while a geographic barrier separates two populations of a flowering-plant species. This is because if pollen from one population cannot fertilize the female reproductive parts of another population, it can lead to the formation of different species. Hence, the answer is option C.

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This process is called __ metastasis________ and represents a serious threat to the body.

Metastasis is the spread of cancer cells from the site of the original tumor to other parts of the body where they can form new tumors. This is a complex process that involves the cancer cells breaking away from the original tumor traveling through the bloodstream or lymphatic system, and then invading and colonizing a new tissue.

Metastasis is a key feature of malignant tumors and is responsible for the majority of cancer-related deaths. It is also a major challenge in cancer treatment as metastatic tumors are often resistant to conventional therapies and may require more aggressive or targeted approaches.

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In the human physiology lab you could measure the physiological activity of all the following except Heart.

Muscle activity can be measured using methods like electromyography (EMG), which records the electrical activity of muscle fibers. This can be used to evaluate the effects of training or rehabilitation programs, as well as to assess muscle function and identify neuromuscular disorders.

Lung activity can be measured using methods like spirometry, which measures the volume and flow of air in and out of the lungs. This can be used to evaluate lung function, identify respiratory disorders.

Liver activity can be evaluated using blood tests that assess liver function, such as measurements of liver enzymes, bilirubin, and other liver health markers.

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Answer:

Explanation:

Sports leadership requires certain attributes and responsibilities. Attributes include strong communication skills, motivation, determination, strategic thinking, and the ability to inspire and influence others. Responsibilities of sports leadership include setting goals, providing direction and guidance, motivating team members, making decisions, and promoting teamwork and sportsmanship.

Examples of successful sports leaders include:

Alex Ferguson: He is a former soccer manager who led Manchester United to numerous championships. He was known for his strategic thinking, motivational skills, and ability to build successful teams.

Pat Summitt: She was a legendary women's basketball coach who led the University of Tennessee to eight national championships. She was known for her strong leadership skills, determination, and commitment to developing her players both on and off the court.

When evaluating the attributes of successful sports leaders, it is important to consider their ability to motivate and inspire their teams, their strategic thinking and decision-making skills, their ability to build successful teams and promote teamwork and sportsmanship, and their commitment to developing their players.

When comparing and contrasting successful sports leaders, it is important to consider their individual leadership styles, their approaches to coaching and motivating their teams, their success in achieving their goals, and their impact on their respective sports and communities.

In the botany lab, there are many types of leaves, and a classmate might not be able to understand why they exist. To help him understand, there are a few things you could say, and these include: Leaves perform vital functions for plants, such as photosynthesis, respiration, and transpiration.

They aid in the exchange of gases and water, allowing for the removal of carbon dioxide and the absorption of oxygen from the atmosphere. The leaves can be classified based on the type of tissue present and the leaf arrangement. For example, simple leaves have only one leaf blade, while compound leaves have multiple leaflets arranged in a specific pattern. There are numerous adaptations to the leaf to survive in a range of environments. These adaptations include thick waxy cuticles to reduce water loss in arid climates, needle-like leaves to minimize surface area and reduce water loss, and brightly colored leaves that help to attract pollinators. There are several types of leaves, and each type serves a specific purpose. They are not only essential to the survival of plants but also contribute to their beauty and diversity.

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Monosaccharides are simple sugar molecules that are the basic building blocks of carbohydrates.

Monosaccharides, also known as simple sugars, are the most basic units from which all carbohydrates are constructed.

To begin with, monosaccharides are highly soluble in water, making concentrated storage difficult without attracting water molecules and becoming diluted.

Second, because monosaccharides are small molecules that are easily metabolized by enzymes, they cannot provide sustained energy over long periods of time.

Finally, monosaccharides are less compact than other storage molecules like lipids. Because lipids are highly insoluble in water, they can be stored in concentrated form without being diluted by water molecules.

Thus, while monosaccharides are important for providing energy to living cells, they are not suitable as long-term storage molecules due to their solubility in water, susceptibility to enzymatic breakdown, and lack of compactness compared to other storage molecules.

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The correct trait where it most likely evolved on the phylogeny is:

Angiosperms then Charophyte green algae then Gymnosperms then comes ferns and in the last it is mosses.

Plants are eukaryotic organisms that make up the kingdom Plantae. These organisms are native to aquatic habitats and have evolved to colonize land. The slow process of evolution has led to the development of 5 diverse floras, each with characteristics common to all of its members.

Step 2: Differences in Aquatic and Terrestrial Plant Habitats

The two main differences between terrestrial and terrestrial habitats are water availability and temperature range. In aquatic habitats, water is abundant and used for a variety of purposes, including gamete conjugation; the water temperatures are also not very high.

In contrast, terrestrial habitats present several challenges to land colonization due to water scarcity and extreme temperature ranges.

Stage 3: Phylogeny of Plants

As plants evolved from aquatic to terrestrial regions, various adaptations and structural modifications occurred. Algae plants (like algae) have a very simple body structure formed from bacterial cells. The distinguishing characteristic between algae and other plants is the formation of embryos (absent in algae).

Among embryogenic plants, bryophytes lack vascular tissue, and all other plant groups have vascular tissue.

Ferns (ferns) differ from the other two groups in that they cannot form seeds.

Two groups of plants with seed development potential are distinguished on the basis of flower production, unlike angiosperms and gymnosperms.

Complete Question:

Use the letters a–d to label where on the phylogenetic tree each of the following derived characters appears. (A) flowers (B) embryos (C) seeds (D) vascular tissue. The letters A to D have been shown in the phylogenetic tree below figure.

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Answer:

Interphase is not a phase of mitosis. It is a phase prior to mitosis during which the cell does not divide but makes preparations to divide.

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Genetic information in the cell is held by information molecules, including all except phospholipids.

A phospholipid is a kind of lipid that is the fundamental component of the cell membrane. Lipids are compounds that include fats, waxes, and vitamins, among other things. Two fatty acids, a phosphate group, and a glycerol molecule make up each phospholipid molecule. When multiple phospholipids line up, they produce a double layer, which is seen in all cell membranes.

Genetic information comprises your genetic testing as well as the genetic tests of your family members. Genetic information also contains any sickness, ailment, or condition that your family relatives have.

COMPLETE QUESTION

Genetic information in the cell is held by information molecules, including all EXCEPT which of the following?

DNAs

polypeptides

RNAs

phospholipids

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The age of thorium -234 with half life of 24 days to contain only 25 grams is 72 days.

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Answer: D. The reproductive cells have half as many chromosomes as the body cells.

Answer:

Diffusion is the movement of molecules from an area of high concentration of the molecules to an area with a lower concentration. For cell transport, diffusion is the movement of small molecules across the cell membrane.

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