The deepest layers of the epidermis are supplied by diffusion from blood capillaries found in the top layers of the dermis because the epidermis lacks blood vessels.
Which layer of skin is devoid of blood vessels?the epidermis The keratinized, stratified squamous epithelium makes up the epidermis. Depending on where it is located in the body, it has four or five layers of epithelial cells. It does not contain any blood vessels.
Why is the epidermis blood vessel-free?Because it is primarily composed of dead cells that are regularly shed off, the epidermis lacks blood arteries and nerves in contrast to the dermis and hypodermis. The division of cells produces new cells that are continually replacing the dead skin cells.
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the ability to reach threshold without stimulation is called the of the sa node.
The ability of the SA (sinoatrial) node to reach threshold without stimulation is called the intrinsic firing rate.
What is SA node?
The SA node is a group of specialized cardiac muscle cells located in the upper right atrium of the heart. It serves as the heart's natural pacemaker, initiating electrical impulses that travel through the atria and ventricles, causing them to contract and pump blood throughout the body. The SA node's ability to generate these electrical impulses on its own, without any external stimulation, is referred to as its intrinsic firing rate. The intrinsic firing rate of the SA node is determined by its unique properties, which include automaticity, excitability, and conductivity. Automaticity refers to the ability of the SA node to initiate electrical impulses spontaneously, without any external stimulation. Excitability refers to the ability of the SA node to respond to electrical signals, allowing it to reach threshold and initiate an action potential.
Conductivity refers to the ability of the SA node to transmit electrical impulses to other cells, allowing the heart to contract and pump blood.
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Which factor of insect success results in the need for limited resources?a) Reproductive Potential. b) Small Size. c) Flight. d) Metamorphosis.
Small size factor of insect success results in the need for limited resources . Insects adapt to their environment in many ways .
Option B is correct.
What are the factors that contribute to insects' success?Insects are thought to be so successful due to their small size, ability to fly, and protective outer shell, or exoskeleton. Because of their small size and their ability to fly, they can get away from enemies and move to new places.
How successful are insects' evolutionary processes?In the history of life, insects are the most successful group of organisms. Over half of the world's biodiversity is made up of insects, which are regarded as the most evolutionary successful group of organisms.
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because animals store glycogen in their muscles, meat, fish, and poultry are good sources of carbohydrates.A. True
B. False
False, Meat, fish, and poultry are not considered good sources of dietary carbohydrates, despite the fact that animals store glycogen in their muscles.
What are some examples of good sources of carbohydrates?Good sources of carbohydrates include whole grains, fruits, vegetables, beans, and legumes.
What is glycogen and where is it stored in the body?Glycogen is a complex carbohydrate that is stored in the liver and muscles of animals, including humans. It serves as a short-term energy reserve for the body. While meat, fish, and poultry do contain small amounts of glycogen, they are not considered significant sources of dietary carbohydrates.
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which structure is specialized for the detection of the stimulus that triggers a phototaxic response in certain protists?
The specialized structure for the detection of the stimulus that triggers a phototaxic response in certain protists is called: eyespot.
Phototaxis is the movement of an organism by the detection of light. This process is particularly useful for the autotrophic organisms who can adjust themselves according to the most efficient light in order to perform photosynthesis.
Eyespot is an organelle particular present in various protists, involved in the function of photoreception. These are the small organelles with large amount of carotenoid pigment which helps in phototaxis. The eyespot can detect the intensity as well as the direction of incoming light.
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Which of the following serves as a role of the nervous system?
To sense your surrounding with your eyes and other sense organs.
To control your internal body systems and keep them in balance.
To use language, think, learn, and remember.
all of the above
Answer:
A and B i believe.
im not an expert on biology but im pretty sure its A and B
a protein that binds to the operator and blocks the rna polymerase is called?
A protein that binds to the operator and blocks the rna polymerase is called repressor
What sort of protein attaches to a transcriptional operator and stops transcription?The operator gene is bound by a repressor protein that prevents the operon's structural genes from being transcribed in the absence of an inducer.
RNA polymerase interacts with a region of DNA called the promoter, which is near to the gene's start. In bacteria, each gene has its own promoter, which is a collection of co-transcribed genes. The template for transcription is produced when RNA polymerase splits the DNA strands into single strands after binding.
Repressors prevent RNA polymerase from connecting to or moving forward by attaching to operator sequences that are downstream of the promoters and limiting transcription.
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The ribosome ______ subunit has ______ binding sites for tRNA molecules. a. large; two b. small; two c. large; three d. small; three e. large; four
Option A. Large; three. Ribosomes are composed of two subunits, the large subunit and the small subunit.
The large subunit is responsible for the formation of peptide bonds between amino acids during protein synthesis, while the small subunit is involved in the recognition and binding of mRNA. The large subunit of the ribosome has three binding sites for tRNA molecules, which are the A site (aminoacyl site), P site (peptidyl site), and E site (exit site). The A site is where the incoming tRNA binds with its attached amino acid, the P site is where the growing peptide chain is held, and the E site is where the empty tRNA exits the ribosome. The small subunit of the ribosome also contains a single binding site for mRNA, which is where the mRNA binds and is translated into a protein.
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the sticky material between cells of areolar connective tissue is called the
The gel matrix refers to the gooey substance that holds the cells of the areolar connective tissue together.
What does a body's tissue refer to?
Fibrocartilage, epithelial tissue, muscular tissue, and nerve tissue are the four fundamental forms of tissue. Other tissues are held together and supported by connective tissue. Skin and the linings of the body's different passageways are examples of epithelial tissue that provides a covering.
What is a tissue, exactly?
A collection of cells with similar structures and functions is referred to as a tissue. The intercellular matrix, a nonliving substance, fills the void between the cells. There might be a lot of this in some cells and not much in others.
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What are vestigial structures 3 examples?
Vestigial structures are remnants of structures or organs that were present in an ancestor species but are no longer present in the current species. Examples of vestigial structures include the wings of the ostrich, the appendix in humans, and the hind leg bones of the whale.
They are anatomical structures that have lost their original function through the process of evolution. They are often referred to as "leftover" or "useless" parts of the body. However, some vestigial structures may have gained new functions over time.
Here are 3 examples of vestigial structures:
1. The appendix: The appendix is a small, tube-like structure that is attached to the large intestine. It is believed to have once played a role in digesting tough plant material, but is now considered to be a vestigial structure as it no longer serves a necessary function in the human body.
2. Wisdom teeth: Wisdom teeth are the third set of molars that typically emerge during young adulthood. However, due to the evolution of the human jaw, many people do not have enough room in their mouth for these teeth, and they often become impacted or cause other dental problems.
3. Tailbone: The tailbone, or coccyx, is a small, fused set of vertebrae at the base of the spine. It is believed to be the remnant of a tail that was once present in our ancestors, but is now considered a vestigial structure as it no longer serves a functional purpose.
Overall, vestigial structures are a fascinating reminder of our evolutionary history and the changes that have occurred in our anatomy over time.
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1. List the 3 parts of the cell theory below:
2. Identify the part of the cell theory represented by the images below. Do NOT just write part 1 or
part 2!!
can some one help me with this 2 questions
The cell theory was first proposed by Schwann and Schleiden, then modified by Virchow, and, with time, completed by several researchers to get to the modern version. 1) 1- The cell is the structural and physiological unit of living beings. 2- The cell is the most basic independent unit of life. 3- Cells transmit genetic material during cell division to daughter cells. 2) 1- Cells are the basic units of reproduction, they originate by division of pre-existing cells. 2- All living organisms are made up of cells. 3- The chemical composition is basically the same in all cells.
What is the cell theory?
The cell theory was first proposed by Schwann and Schleiden around 1830. After a few years, Virchow rejected the third state of Schwann and Schleiden’s ideas about spontaneous generations, and proposed that cells were the product of other pre-existing cells and originated by cellular division.
Currently, the cell theory states that
All living organisms are made up of cells.The cell is the structural and physiological unit of living beings.Cells are the basic units of reproduction, they originate by division of pre-existing cells.The cell is the most basic independent unit of life.And the modern version of the theory adds a few more aspects,
Energy flows within cells.Cells transmit genetic material during cell division to daughter cellsThe chemical composition is basically the same in all cells.1) 3 parts of the cell theory:
1- The cell is the structural and physiological unit of living beings.
2- The cell is the most basic independent unit of life.
3- Cells transmit genetic material during cell division to daughter cells
2) Identify the part of the cell theory represented by the images below.
1- Cells are the basic units of reproduction, they originate by division of pre-existing cells.
2- All living organisms are made up of cells.
3- The chemical composition is basically the same in all cells.
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which structure of the urinary system is responsible for filtering out blood of toxins?
Nephrons which are present in the kidneys are basically responsible for the filtering out of the blood toxins.
Nephrons are basically microscopic tube-like structures which are present in the kidneys which perform the function of filtering out the blood and also cause the waste to be removed from the blood. They can be called as the functional units of the kidney.
Nephrons are tiny filtering units which form the main functional units of the kidneys. These are basically responsible for removing the harmful toxins as well as excess fluids which is present in the blood, keeping it clean as well as maintaining its correct volume and concentration.
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The name ________, which is most common in Appalachia, stems from groundhogs' habit of making a high-pitched whistling sound, usually as a warning to other groundhogs when they feel threatened.
The term "whistle-pig," which is most prevalent in Appalachia, comes from groundhogs' propensity of whistling loudly when threatened, mainly to warn other groundhogs.
What other name is given to a groundhog?Woodchucks and "whistle-pigs" are other names for groundhogs. The common term "woodchuck" is derived from Native American names for them, including "wuchak," "wejack," and probably "otchek," which is a word for fishers. However, the name has nothing to do with wood.
The origin of the name "whistle pig" for groundhogs?Whistle-pigs get their name from the fact that when startled, groundhogs would whistle loudly to warn the remainder of their colony. Wood has nothing to do with the name Woodchuck. Or throwing. It is derived from the Algonquian word wuchak for the creatures.
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What is protein synthesis and what is its function?
Protein synthesis is the process by which cells produce new proteins. This process is essential for the growth, maintenance, and repair of cells and tissues in the body. Protein synthesis is controlled by genes, which contain the instructions for making proteins. The process of protein synthesis involves two main steps: transcription and translation.
Transcription is the first step in protein synthesis. During transcription, the genetic information in DNA is copied into a molecule of messenger RNA (mRNA). This process occurs in the nucleus of the cell.
Translation is the second step in protein synthesis. During translation, the mRNA molecule is read by a ribosome, which uses the information to assemble a chain of amino acids. The sequence of amino acids determines the structure and function of the protein. This process occurs in the cytoplasm of the cell.
The function of protein synthesis is to produce new proteins that are needed by the body. Proteins are essential for a wide range of functions, including structural support, enzyme catalysis, and immune defense. Without protein synthesis, cells would not be able to grow, repair themselves, or carry out their normal functions.
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what is the reasoning why acidic dyes stain only the background and not the cells?
Acidic dyes are negatively charged and are repelled by the negatively charged bacterial cell surface, causing them to only stain the background.
Why do acidic dyes not stain bacterial cells?Acidic dyes are negatively charged and are repelled by the negatively charged bacterial cell surface. This causes the dyes to only stain the background and not the bacterial cells.
What is the principle behind the use of acidic dyes in bacterial staining?Acidic dyes are used in bacterial staining to create a contrast between the bacterial cells and the background. Since acidic dyes only stain the background, they allow the bacterial cells to stand out and be easily visible under a microscope.
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select all the roles that membranes play in cells.
A. Transport substances into and out of the cell
B. Receive and respond to external stimuli
C. Enclose organelles in eukaryotic cells
D. Transcribe DNA into RNA and assembles ribosomes
Membranes in cells play a crucial role in transporting substances into and out of the cell and enclosing organelles in eukaryotic cells. (option a and c)
Membranes are thin, semi-permeable layers that surround cells and organelles. They play a critical role in maintaining the functional integrity of cells by controlling what enters and exits the cell. Membranes are composed of a lipid bilayer, a double layer of phospholipid molecules, that acts as a barrier and selectively regulates the flow of molecules and ions in and out of the cell.
This allows cells to control their internal environment and communicate with their surroundings. In eukaryotic cells, membranes also enclose individual organelles, creating specialized compartments within the cell and allowing for compartmentalization of cellular processes.
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what long bone structure is formed from dense irregular connective tissue and is responsible for growth in bone width?
Bone width increases due to the formation of the periosteum, a lengthy bone structure made of dense, uneven connective tissue.
Which long bone contains connective tissue that is densely irregular?An uneven, thick connective tissue makes up the periosteum. By connective tissue fibers known as Sharpey's fibers, this tissue layer is attached to or fastened to compact bone. Collagen type I, which enters the lamellae of compact bone, is used to make these fibers.
Appositional growth occurs in hyaline cartilage.The process by which bone develops from hyaline cartilage is known as endochondral ossification. Chondrocyte division and hyaline cartilage secretion cause long bones to lengthen.
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what binds to the promoter in prokaryotic cells? in eukaryotic cells?
Transcription repressors are the ones that bind to the promoter in the prokaryotic cells and eukaryotic cells.
Eukaryotic cells contain ways to stop transcription, just like prokaryotic cells do. Repressors of transcription can attach to enhancer or promoter regions and stop transcription. Repressors react to environmental cues similarly to transcriptional activators in order to block the binding of activating transcription factors.
The control of gene expression is regulated by the organization of the genes. The region of promoter is also dependent on these genes. This area can be quite long or significantly short. The longer the promoter more area is there for the proteins to bind. Additionally, this gives the transcribing process a greater control. The promoter's size varies significantly between genes and is gene specific.
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What are 5 examples of non vascular plants?
5 examples of non-vascular plants are Mosses, Liverworts, Hornworts, Anthocerotophyta, and Marchantiophyta.
Non-vascular plants, also known as bryophytes, are a group of plants that do not have a well-developed system of tubes for transporting water and nutrients throughout the plant. Here are five examples of non-vascular plants:
Mosses: Mosses are one of the most well-known types of non-vascular plants. They are found in many different environments, from forest floors to rocky outcroppings, and are often used in gardening and landscaping.
Liverworts: Liverworts are another common type of non-vascular plant. They are named for their liver-shaped thalli (leaf-like structures) and are often found in moist environments such as bogs and swamps.
Hornworts: Hornworts are a type of non-vascular plant that are named for their horn-shaped sporophytes. They are typically found in damp soil or near streams and ponds.
Anthocerotophyta: This is a small group of non-vascular plants, also known as hornworts, which are often found in damp soil or near streams and ponds.
Marchantiophyta: This is a diverse group of non-vascular plants commonly known as liverworts, which are named for their liver-shaped thalli (leaf-like structures). They are typically found in moist environments such as bogs and swamps.
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The intrinsic conduction system structure that initiates atrial depolarizationA. P waveB. SA NodeC. Qrs ComplexD.AV Node
The SA Node is the intrinsic conduction network structure that starts atrial depolarization.
Depolarization impulses are started by the heart's intrinsic conduction system. Heart contractions are synchronised as a result of action potentials propagating throughout the organ. The electrical impulses of the heart is captured by an ECG wave trace. Under typical circumstances, the sinus node produces an electrical stimulus 60 or 100 times per minute. Then the atria are turned on. The electrical shock causes your heart's ventricles to heart is contracting blood as it moves through the conduction pathways. The sino - atrial (SA) node, a small clump of specialised tissue situated in the atria, is where the heart's chance to dominate begins. An impulse from of the SA node causes the heart muscle to become depolarized and contract.
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What are the Nine 9 regions of the abdomen?
The nine regions of abdomen consist of Epigastric, Umbilical, Hypogastric, Left Lumbar etc.
The nine regions of the abdomen are:
- Right hypochondriac region: located in the upper right quadrant of the abdomen, below the ribs
- Epigastric region: located in the upper central quadrant of the abdomen, above the navel
- Left hypochondriac region: located in the upper left quadrant of the abdomen, below the ribs
- Right lumbar region: located in the middle right quadrant of the abdomen
- Umbilical region: located in the center of the abdomen, around the navel
- Left lumbar region: located in the middle left quadrant of the abdomen
- Right iliac region: located in the lower right quadrant of the abdomen, near the hip bone
- Hypogastric region: located in the lower central quadrant of the abdomen, below the navel
- Left iliac region: located in the lower left quadrant of the abdomen, near the hip bone
These regions are used to help identify the location of organs and structures within the abdomen, as well as to describe any pain or discomfort that may be experienced.
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what is fusiform face area?
For typically developing individuals, the fusiform face area (FFA) is a region of the cortex in the inferior temporal lobe of the brain that has been found to respond most strongly to faces compared to other types of input (e.g., objects).
The FFA is located on the lateral side of the fusiform gyrus in the ventral stream on the ventral surface of the temporal lobe. It is located lateral to the parahippocampal position area. It has some lateralization, with the right hemisphere being larger.
The FFA was identified and is still being studied in humans utilizing positron emission tomography (PET) and functional magnetic resonance imaging (fMRI). Typically, a person sees visions of faces, objects, places, and bodies, as well as scrambled faces, objects, places, and bodies.
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Many organisms of a food chain feed on plants to derive energy for their vital activities. What is the food from which plants derive energy for their own growth and reproduction? Responses oxygen released by other plants oxygen released by other plants nutrients absorbed from the soil nutrients absorbed from the soil minerals absorbed from water in the soil minerals absorbed from water in the soil sugars made from carbon dioxide and water sugars made from carbon dioxide and water
Light work is the food from which plants derive energy for their own growth and reproduction.
What is carbon dioxide ?One part carbon and two parts oxygen make up the gas called carbon dioxide. Its usage by plants to create carbohydrates during a process known as photosynthesis makes it one of the most significant gases on the planet.
What is reproduction?Creating offspring is considered reproduction. An organism that reproduces sexually integrates the genetic makeup of both parents to create a genetically distinct individual. One parent replicates itself to create a genetically identical offspring in asexual reproduction.
Therefore, Light work is the food from which plants derive energy for their own growth and reproduction.
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As malaria death rate increases, what would you expect to happen to the number of sickle-cell deaths?
When the death rate from malaria rises. There would be fewer deaths from sickle cell disease.
Describe malaria.People can get the potentially fatal disease known as malaria by being bitten by female Anopheles mosquito, which are known to transmit the parasites that cause it. It is treatable and preventable. Globally, 247 million cases of malaria were estimated to have been detected in 2021.
Does malaria have the highest mortality rate?Malaria represents one of the oldest illnesses to have been identified on Earth. It remains one of the world's most lethal diseases despite multiple international efforts to reduce death rates. Malaria is a serious condition that can be fatal if it is not promptly identified and treated. Even when they first occur, malaria symptoms might worsen hours or days later.
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What is five spotted hawkmoth?
The five-spotted hawkmoth (Manduca quinquemaculata) is a brown and gray Sphingidae hawk moth. The caterpillar, sometimes known as the tomato hornworm, is a severe nuisance in gardens.
Tomato hornworms are linked to (and occasionally confused with) tobacco hornworms (Manduca sexta). This mistake arises because both species' caterpillars feed on the leaf of diverse plants in the Solanaceae family, therefore either species can be seen on tobacco or tomato... his species is extremely closely related to the Carolina Sphinx. The tomato hornworm is the caterpillar of the Five-spotted Hawkmoth.
But, in my experience, most "tomato worms" in the Chicago area are actually "tobacco hornworm" Carolina Sphinx caterpillars.
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What is the name of the spinal region that provides support and mobility for the back?
The skin and muscles of the back are innervated by the dorsal ramus of each spinal nerve. It carries the data that would feed the human back's muscles and sensation.
The spinal cord extends the central nervous system (CNS), which is made up of the brain and spinal cord. The spinal cord extends from the medulla oblongata at the base of the brain stem to the lower back, where it tapers to form the conus medullaris, a cone-shaped structure.
Anatomically, the spinal nerve stretches from the top of the C1 vertebra, the tallest neck bone, to about the level of the L1 vertebra, the highest vertebra in the lower back, which is situated just below the rib cage. The spinal cord is approximately cylinder-shaped and is around 18 inches (45 cm) long. From the epidermis to the back muscles, it would transmit sensory, somatic, and visceral motor data.
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Scenario
Photosynthesis is a process that takes place in plants. Carbon dioxide and water are converted into sugar and oxygen. The energy source that allows plants to start this process comes from the Sun. Soil, fertilizer, and minerals are nutrients that plants need to carry out important processes.External Data
Prompt Write a scientific explanation for which substance(s) illustrated above are food for plants.Claim:Evidence:Reasoning:
Answer:
grow and produce energy through photosynthesis.
Explanation:
In this process, the chloroplasts in the leaves of the plant contain chlorophyll, which is responsible for capturing the energy from sunlight. This energy is used to split the water molecules into hydrogen and oxygen, and the hydrogen is combined with carbon dioxide to produce glucose (sugar) and release oxygen as a byproduct.
This process is critical for the survival of plants and plays a significant role in the global carbon cycle, as it helps to remove carbon dioxide from the atmosphere and release oxygen into the air. Additionally, photosynthesis is the primary source of food and energy for nearly all life on Earth, as plants are the foundation of nearly all food chains.
What are the 3 domains and examples?
The three domains of are Archaea, Bacteria, and Eukarya with Euryarchaeota, Cyanobacteria, and Fungi as examples respectively.
The six-kingdom classification was proposed by Carl Woese. Because it divides life forms into three categories, this classification method is also known as the "Three Domains Classification." Organisms are divided into six kingdoms and three domains according to this taxonomy. The three domains are archaea, bacteria, and eukarya, while the six kingdoms are Archaebacteria, Eubacteria, Protista, Fungi, Plantae, and Animalia.
The kingdoms Archaebacteria and Eubacteria constitute a single kingdom in five-kingdom classification proposed by R.H. Whittaker. The domain archaea and bacteria comprise of prokaryotic organisms with organisms in domain archaea can survive extreme temperature conditions due to their specialized cell walls.
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Some proteins that are on the surface of mammalian cells contain carbohydrates. These proteins are synthesized by _____ and the carbohydrates are added in the _____. a) Golgi apparatus; rough endoplasmic reticulum b) cytoplasmic ribosomes; cell membrane c) mitochondrial ribosomes; smooth endoplasmic reticulum
Some proteins that are on the surface of mammalian cells contain carbohydrates. These proteins are synthesized by the rough endoplasmic reticulum; and the carbohydrates are added in the Golgi apparatus;
Mammalian cells are eukaryotic in general. It means each cell is far more sophisticated than a bacterial cell. Furthermore, because mammals are made up of billions of distinct cells in a variety of organs and tissues, there is a great deal of specialization among mammalian cells.
The immortalized Chinese hamster ovary (CHO) cell is the most often employed mammalian cell, but a variety of additional lines, including baby hamster kidney (BHK), human embryo kidney (HEK), mouse myeloma (NS0), and human retinal cells, have been licensed for manufacture of biopharmaceutical proteins (see References 16 and 17).
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what criterion does the biological species concept use to identify species?
The Biological Species Concept (BSC), which defines species as collections of interbreeding individuals that continue to reproduce, is the standard method for differentiating species.
According to the biological species idea, which criterion is employed to differentiate between species?According to Mayr, determining if there is shared reproduction within an organism population and whether there are obstacles to reproduction with other organisms is the key to recognising species.
What trait allows two species to be distinguished from one another?Most evolutionary biologists make the distinction between one species and another based on reproductivity: if two individuals of a different species mate, the offspring are frequently sterile, unviable, or have some other reduced fitness.
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molecular dynamics simulations show that the structure of proteins
The relationship between structure and dynamics is bridged, as demonstrated by molecular dynamics simulations, by the protein's structure, which makes it possible to study the conformational energy landscape that protein molecules can choose from.
How do proteins work? What are they used for?The body depends heavily on proteins, which are big, complicated molecules. They carry out the majority of the work inside cells and are necessary for the regulation, construction, and operation of all the tissues and organs in the body.
How does a shortage of protein affect you?A severe protein deficiency can hinder children's growth, result in fatty liver, swollen skin, and skin aging. It can also make infections more severe. True deficiency is uncommon in affluent nations, although a low intake can lead to muscular atrophy and an elevated risk of fractures.
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