Sphincters are mainly found throughout the small intestine so the correct option is A.
Sphincters are muscular structures set up throughout the digestive tract that act as faucets, controlling the movement of food and waste. They're set up in between the esophagus, stomach, small intestine, and large intestine. In the small intestine, sphincters are set up between the duodenum and jejunum, and between the jejunum and ileum.
These sphincters act as a hedge, precluding food and waste from back- flowing and mixing together. On the outside of the digestive tract, sphincters are set in between the pharynx and the mouth, helping to control the inflow of air and food. These sphincters also help to keep food and air from entering the lungs.
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all intrinsic muscles of the tongue are innervated by cranial nerve xi. group of answer choices true false
Answer:
False
Explanation:
platelets are surface antigens. giant, multinucleated cells. immature leukocytes. fixed macrophages. cellular fragments.
Platelets are cellular fragments. Option (B)
Platelets, also known as thrombocytes , are blood components whose job (together with coagulation factors) is to clump in response to bleeding from blood vessel damage, therefore beginning a blood clot.
Platelets have no cell nucleus; they are cytoplasmic fragments generated from bone marrow or lung megakaryocytes, which subsequently enter the circulation. Platelets are only present in mammals, whereas thrombocytes circulate as complete mononuclear cells in other vertebrates (e.g., birds and amphibians).
Platelets play an important role in hemostasis, which is the process of halting bleeding at the site of a disrupted endothelium. They congregate at the place and, unless the disruption is physically too big, fill the hole.
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Full Question: Platelets are
A) giant, multinucleated cells.
B) cellular fragments.
C) immature leukocytes.
D) fixed macrophages.
E) surface antigens.
how can marine biotechnology most directly impact individual people? by causing an increase in the need for fishing by causing more frequent oil spills by providing new medicines, such as antibiotics from fungi by providing ways to improve ecotourism
Using modern technology and procedures for cleaning up oil spills on beaches and in the water.
Natural selection is an evolutionary mechanism. Organisms that are more suited to their surroundings are more likely to survive and pass on the genes that helped them thrive. Species change and diverge as a result of this process.
Biotechnology feeds the world by increasing crop yields with fewer inputs, reducing the amount of agricultural chemicals required by crops and limiting run-off of these products into the environment, and using biotech crops that require fewer pesticide applications and allow farmers to reduce tilling farmland.
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a pigeon has cells containing 80 chromosomes. if a female pigeon undergoes meiosis, how many chromosomes would be found in the resulting unfertilized egg?
As previously mentioned, the pigeon's chromosomal count was somewhere around 80. (Makino et al., 1956; Ohno et al., 1964b).
Although there was no clear distinction between the macro- and microchromosomes, it was nevertheless possible to see that they were two rather distinct chromosome groups. Humans have the same number of chromosomes in each generation because to the other type of cell division called meiosis. In order to create sperm and egg cells, a two-step process that decreases the number of chromosomes from 46 to 23.
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explain how betta fish show incomplete dominance
In betta fish, alleles for color are incompletely dominant. Green fish have genotype CC, dark blue fish have genotype cc, and royal blue fish have genotype Cc. Two royal blue betta fish are crossed.
Define incomplete dominance?
Incomplete dominance is a form of Gene interaction in which both alleles of a gene at a locus are partially expressed, often resulting in an intermediate or different phenotype. It is also known as partial dominance. For eg., in roses, the allele for red colour is dominant over the allele for white colour.Incomplete dominance can occur because neither of the two alleles is fully dominant over the other, or because the dominant allele does not fully dominate the recessive allele. This results in a phenotype that is different from both the dominant and recessive alleles, and appears to be a mixture of both.Pink roses are often the result of incomplete dominance. When red roses, which contain the dominant red allele, are mated with white roses, which is recessive, the offspring will be heterozygotes and will express a pink phenotype.To learn more about incomplete dominance refers to:
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T/F : thyroid hormone production requires the presence of both iodine and calcium.
Answer:
FALSE
Explanation:
tonicity is the ability of a solution to affect the fluid volume and pressure in a cell. T/F
The statement "tonicity is the ability of a solution to affect the fluid volume and pressure in a cell" is true based on its concentration of solutes relative to the cell.
Tonicity is a measure of the concentration of solutes in a solution relative to the concentration of solutes inside a cell. It describes the ability of a solution to affect the fluid volume and pressure inside the cell. Tonicity can be hypotonic, hypertonic, or isotonic.
A hypotonic solution has a lower concentration of solutes than the cell, and causes the cell to absorb water and swell.
A hypertonic solution has a higher concentration of solutes than the cell, and causes the cell to lose water and shrink.
An isotonic solution has an equal concentration of solutes as the cell, and does not affect the fluid volume or pressure inside the cell.
The concept of tonicity is important in cell biology, particularly in the study of the behavior of cells in different solutions and the regulation of fluid and solute balance in the body.
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which structure is highlighted? the image shows a blank space in the middle of a yellow-colored structure.which structure is highlighted? ventral horn dorsal horn central canal gray commissure
The anterior/ventral grey horns contain the cell bodies of the motor neurons that supply skeletal muscles.
Axons and dendrites, two types of prolongations that have the job of carrying information to other neurons or tissues, are two characteristics that distinguish neurons from other cells. Axons are typically very lengthy (much shorter than axons). Muscle contraction and movement are made possible by the motor neurons, which transport electric impulses from the motor cortex in the brain to the skeletal muscles in our body. Motor neurons come in two different varieties: Upper motor neurons: The motor cortex in the precentral gyrus of the brain is where their cell bodies are found. Their axons connect to spinal cord interneurons.
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Which characteristic describes the troposphere?
contains the ozone layer
has the highest air pressure
spans 12–50 km above Earth
is a good place for planes to fly\
The characteristic that describes the troposphere is that it has the highest air pressure. The correct option is B.
What is troposphere?The lowest part of the atmosphere on Earth is called the troposphere. The troposphere contains the majority of the atmosphere's mass (about 75–80%).
The troposphere is where the majority of clouds are situated, and it is where practically all weather takes place.
About 85 to 90% of the mass of the Earth's atmosphere is found in the troposphere, which is the first layer above the planet's surface. It is characterised by a temperature that drops as altitude rises.
Thus, the correct option is B.
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Answer: has the highest air pressure
Explanation:
muscles of the axial skeleton might have an origin or insertion on any of the following except
Except for the humerus and femur, any of the following can serve as the origin or insertion point for axial skeleton muscles.
The 80 bones that make up the centre core of your body are part of the axial skeleton. Your skull, neck, back, and chest bones are part of this. Your axial skeleton supports and cushions your organs, spinal cord, and brain. The axial skeleton includes the head, laryngeal skeleton, vertebral column, and thoracic cage.
The bones that correspond to the arms and legs, respectively, are the humerus and femur. Despite having largely comparable pieces, their structures have been altered to fulfil various objectives. The femoral head is roughly two-thirds of a sphere, but the humeral head is almost hemispherical.
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The complete question is:
Muscles of the axial skeleton might have an origin or insertion on any of the following except...
1. bones of the skull
2. humerus, femur
3. cranial bones, cervical vertebrae
4. thoracic vertebrae, lumbar vertebrae
In the Human Homeostasis Gizmo, you can control both involuntary and voluntary responses to temperature changes. How good are you at thermoregulation?
There are some voluntary reactions to temperature: When it gets too warm, we take off our jackets. Some are unavoidable: The heat makes us wilt. By contracting our muscles, or shivering, in chilly weather, our bodies produce heat.
How do our bodies occasionally function like a thermostat device?
How occasionally do our bodies function like a thermostat? When we are very heated, our perspiration assists us to cool down. And because our body is attempting to restore to normal temperature when we are too cold, we get fever and get quite hot.
How does the homeostasis gadget work?
You can investigate how the human body maintains a virtually constant temperature under various circumstances using the Human Homeostasis Gizmo. Keep an eye on the body and air temperature thermometers.
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What is the function of the serous fluid in the pericardial cavity?
The frontal and visceral pericardium are two halves of the serous membrane, which is a double-layered membrane.The pericardial membranes produce pericardial fluid for the heart.Pericardial fluid's primary function is to lessen friction as the heart beats inside of the pericardial membranes.
What use does the cardiac serous fluid serve?swollen pericardium This is the pericardium's inner layer.Actually, it has two layers, which are discussed below.Pericardial fluid, which is produced by your serous pericardium, lubricates the heart as it beats.
Is the pericardial cavity filled with serous fluid?The buildup of extra fluid in the sac that surrounds the heart, the pericardium, is referred to as a pericardial effusion.The pericardial sac in a healthy person has 15 to 50 milliliters of fluid . this fluid.
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how is fitness determined in the biological sense?
In a biological sense, fitness is determined based on the ability to reproduce and generate viable offspring.
In biology, fitness is the quantitative representation of any individual reproductive success. It can be defined either with a phenotype in a given environment or time period, or can also be defined with respect to a genotype with the same restriction.
For individuals that can reproduce asexually, assigning fitnesses using genotypes is usually sufficient. However, for individuals that reproduce sexually, the fitness values can be assigned to their alleles by averaging over any possible genetic background.
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huntington's disease is a fatal syndrome caused by a dominant mutation in the hd gene. the disease has an average age of onset of 35 and the majority of individuals that are affected are heterozygotes. what is the probability that a 25-year-old woman with no symptoms and who is the daughter of a man that has hd and a mother who does not will have a child that will have the mutant hd allele? (assume she mates with a man who has normal hd genes.)
The probability that a 25-year-old woman with no symptoms of Huntington's disease and who is the daughter of a man that has HD and a mother who does not will have a child that will have the mutant HD allele is 25%.
We are given the information:
a 25-year-old woman with no symptoms ⇒ hha man has HD ⇒ HHa mother ⇒ hhHH >< hh
Hh - Hh - HH - hh
HH and Hh = Huntington's disease; HH 25% and Hh 50%
hh = normal; 25%
Thus, the probability that a 25-year-old woman with no symptoms of Huntington's disease is 25%.
Your question is incomplete, but most probably your options were
a. 25%
b. 50%
c. 75%
d. hard to tell
Thus, the correct option is A.
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1. True or false: One of the very difficult facts for the creation model to counter is that different radiometric dating techniques almost always come up with the same ages for the same samples.
a. True
b. False
One of the very difficult facts for the creation model to counter is that different radiometric dating techniques almost always come up with the same ages for the same samples. Thus, the given statement is true.
What is Radiometric dating technique?Radiometric dating or radioisotope dating is a technique which is widely used to date materials such as rocks or carbon, in which the trace radioactive impurities were selectively incorporated when they were formed in the earth.
The radiometric dating method compares the abundance of a naturally occurring radioactive isotope within that material to the abundance of the decay products formed at a known constant rate of decay. The use of radiometric dating is the principal source of information about the absolute age of rocks and other geological features of time and species, including the age of fossilized life forms which were once present or the age of Earth itself, and can also be used to date a wide range of natural and man-made materials.
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The products of a particular reaction have more energy than the reactants. Which type of reaction has occurred?.
b. The reaction is endothermic. Products of a specific reaction that are endothermic have more energy than the reactants.
Every chemical reaction that absorbs heat from its surroundings is an endothermic reaction. The energy that is absorbed serves as the reaction's activation energy. Examples of endothermic processes include photosynthesis, the evaporation of liquids, the melting of ice and dry ice, alkane cracking, thermal decomposition, the oxidation of ammonium chloride in water, and many others. Endothermic chemical reactions are those that ingest (or utilise) energy overall.
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When the products of a reaction have more energy than the reactants:
a. The reaction is exothermic.
b. The reaction is endothermic.
c. The reactants gave up energy.
d. The ΔH is positive.
dendritic cells present antigen to b cells in order to activate them. group of answer choices true false
Answer:
False
Explanation:
explain how oxygen is loaded transported and unloaded in the blood
As hemoglobin travels through the peritubular circulation, oxygen is added to it, and as it reaches the peripheral tissues, oxygen in the atmosphere.
What does having low hemoglobin mean?What occurs if hemoglobin levels are low? Your blood levels may decrease if an illness or condition impairs your body's capacity to make red blood cells. You will feel extremely exhausted and weak if the hemoglobin level is low, which indicates that your body isn't receiving sufficient oxygen.
What does a high hemoglobin level mean?The most frequent reason of a high blood count is when your body needs more hemoglobin to deliver oxygen, which happens frequently when you smoke. Human red blood cell synthesis normally rises if you reside at an altitude to make up.
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explain how using antibodies only when essential can limit the development of resistance bacteria such as mrsa
Answer:
It can be prevented by minimising unnecessary
prescribing and overprescribing of antibiotics,
the correct use of prescribed antibiotics, and
good hygiene and infection control.
Classify the following characteristics of RNA and DNA:
A) Contains deoxyribose sugar
B) Contains bases guanine, cytosine, adenine, and thymine
C) Serves as a temporary intermediate between genes and polypeptides
D) Contains ribose sugar
E) Contains bases guanine cytosine, adenine, and uracil
F) Single-stranded
G) Double-stranded
H) Stores genetic information
All living cells contain ribonucleic acid (abbreviated RNA), a nucleic acid with properties comparable to those of DNA. However, RNA is often single-stranded, unlike DNA.
What qualities does a DNA have?The double helix form of DNA is made up of two connected strands that spiral around one another to resemble a twisted ladder. The backbone of each strand is composed of alternating deoxyribose and phosphate groups. Adenine (A), cytosine (C), guanine (G), or thymine are the four bases that are joined to each sugar (T).
Instead of the deoxyribose present in DNA, the backbone of an RNA molecule is made up of alternating phosphate groups and the sugar ribose.
A) DNA
B) DNA
C) RNA
D) RNA
E) RNA
F) RNA
G) DNA
H) DNA and RNA
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embolectomy is the removal of a clot that has traveled into a blood vessel and suddenly caused occlusion. T/F
The given statement is “true”. An embolectomy removes a blood clot that has spread from the blood vessel where it originated to another area of the body. A doctor can do a regular surgery or a minimally invasive technique using a catheter.
The removal of a blood clot or foreign object from a blood vessel is accomplished through embolectomy and thrombectomy operations. Another blood vessel may become the site of a growing or escaping blood clot. The blood supply to organs and tissues can be cut off by foreign objects and blood clots, which can result in a heart attack, stroke, gangrene, limb loss, and other significant difficulties. Sometimes, the terms "embolectomy" and "thrombectomy" are used synonymously. A blood clot is removed using a thrombectomy. An embolus is a blood clot or foreign object that has migrated into a blood vessel and lodged there. The excision of an embolus is known as an embolectomy.
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In humans, the ability to taste phenylthiourea (PTU) is dominant. "Tasters" (TT) or (Tt) perceive an extremely
bitter taste of PTU, while "non tasters" (tt) experience no sensation, or taste. In the following crosses:
a.What are the genotypes of Mr. and Mrs. Meadowmuffin, who can taste PTU, and who have 3 children
one of whom is a non-taster?
a. What offspring phenotypes would be expected from the following crosses and in what ratios?
i) heterozygous x heterozygous
ii) homozygous taster x heterozygous
iii) heterozygous x non-taster
All answers are mentioned below.
What do you mean by phenylthiourea (PTU)?Phenylthiourea (PTU) is a chemical compound that is commonly used as a goitrogenic agent, meaning it interferes with the normal function of the thyroid gland. PTU works by blocking the conversion of thyroxine (T4) to triiodothyronine (T3), which are hormones that regulate metabolism. PTU is often used as a research tool to study the function of the thyroid gland and to induce hypothyroidism (an underactive thyroid) in animal models for the study of various diseases.
a. Mr. and Mrs. Meadowmuffin are both heterozygous for the gene that determines the ability to taste PTU (Tt).
b. i) Heterozygous x heterozygous cross:
Expected offspring phenotypes: Tasters (TT or Tt) and Non-tasters (tt) in a 3:1 ratio.
ii) Homozygous taster x heterozygous:
Expected offspring phenotypes: Tasters (TT or Tt) only in a 2:1 ratio.
iii) Heterozygous x non-taster:
Expected offspring phenotypes: Tasters (Tt) and Non-tasters (tt) in a 1:1 ratio.
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your bmi is a direct measure of your body fat percentage.true or false
False. For both adults and children, BMI is a reliable indication of body fat. BMI should not be utilised as a diagnostic tool because it cannot assess body fat in a direct manner.
BMI should be used as a screening tool to find people who may have weight problems rather than as a way to assess population weight status. Although BMI does not directly measure body fat, it is only slightly linked with other, more precise measurements of body fat 1, 2, 3. The correlation between BMI and many metabolic and illness outcomes appears to be just as robust as it is for these more precise measures of body fatness (4,5,6,7,8,9).
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How does the occipital lobe process visual information?
The occipital lobe receives the visual information from the retina via the thalamus.
The secondary visual cortex, also known as V2, V3, V4, V5, or Brodmann areas 18 and 19, surrounds the primary cortex and receives information from it.
The primary visual cortex transmits information through two pathways: the dorsal and ventral stream.
What is the occipital lobe?
The occipital lobe is the visual processing area of the brain. It's associated with visuospatial processing, distance and depth perception, color determination, object and face recognition, and memory conformation.To know more about occipital lobe, click the link given below:
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Spirilla, a type of bacteria, are
A
organelles
B
prokaryotes
C
mitochondria
D
eukaryotes
Answer:
B. Prokaryotes
Explanation:
Spirilla are a type of bacterium that belongs to the domain Bacteria, which are prokaryotes. Prokaryotes are single-celled organisms without a nucleus or membrane-bound organelles. They have a simple cellular structure and lack the complex internal organization of eukaryotic cells. Spirilla are helical-shaped bacteria, known for their spiral shape and found in a variety of environments, such as freshwater and soil.
localization and sensitivity are easily determined in a ______ receptive field.
Localization and sensitivity are easily determined in a linear receptive field.
A receptive field refers to the region of the visual field or sensory input to which a single neuron in the brain responds. A simple or linear receptive field refers to the type of receptive field where a neuron responds to stimuli in a straightforward, direct manner.
In other words, the neuron fires in response to the presence of stimuli within its receptive field. This type of receptive field is easy to determine because it exhibits a clear and predictable response to stimuli.
Localization and sensitivity can be easily determined in a simple receptive field as it has a clear boundary and sensitivity threshold.
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How could a learner ensure that the results are reliable after an investigation?
Reliable is important in science to protect the reasoning and value of scientific research in its use and replication.
Why are reliable results important?A measurement is reliable if you repeat it and get the same or a similar answer over and over again, and an experiment is reliable if it gives the same result when you repeat the entire experiment.
The experiment is repeated the results are the same (within an acceptable margin of error). Repetition will only determine reliability it will NOT improve it. Reliability can be improved by carefully controlling all variables (except the experimental variables!!)
Reliability is important because it determines the value of a psychological test or study. If test results remain consistent when researchers conduct a study, its reliability ensures value to the field of psychology.
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an african violet grower observes that genetically identical african violet plants growing near the walls of the greenhouse have white flowers, that plants growing farther away from the walls have pale blue flowers, and that plants growing nearest the center of the greenhouse have dark blue flowers. which of the following best explains the differences in flower color of the african violets in the greenhouse? responses warmer temperatures result in genotypic alterations, which result in flower color differences. warmer temperatures result in genotypic alterations, which result in flower color differences. the plants along the walls of the greenhouse are homozygous recessive and therefore have white flowers. the plants along the walls of the greenhouse are homozygous recessive and therefore have white flowers. an enzyme responsible for flower color does not fold correctly in cooler temperatures, and the greenhouse is warmest in the center. an enzyme responsible for flower color does not fold correctly in cooler temperatures, and the greenhouse is warmest in the center. more light is available along the walls of the greenhouse, so the flowers need less pigment to absorb sunlight for photosynthesis.
An enzyme responsible for flower color does not fold correctly in cooler temperatures, and the greenhouse is warmest in the center.
The color of violets is influenced by a protein, or in the case of violets, an enzyme, just like the color of human skin. Proteins in general, including enzymes, require a certain temperature to function. This temperature is necessary for the enzyme to reach its ideal form, which ultimately alters how it functions in an organism.
In response to the previous query, we can say that the violets' colors changed because an enzyme that determines their color does not bend properly at lower temperatures and the greenhouse is warmer in the center. This is because the plants were in a greenhouse, which alters the natural temperature of the environment.
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most babies are born with enough _______ to last about half a year.
The majority of newborns have enough iron to last for roughly six months.
Depending on gestational age, the iron status of the mother, and the timing of umbilical cord clamping, most infants have enough iron stored in their bodies for the first six months of life. However, newborns need an additional source of iron beyond breast milk by the age of 6 months. Newborns have iron reserves in their bodies. Due to their rapid growth, infants and toddlers need to absorb a lot of iron every day. The most common age group of infants who experience iron insufficiency is 9 to 24 months. anaemia. All kids require iron. At every step of your child's development, it is crucial. When it comes to iron, babies who are given exclusively breast milk, exclusively formula, or a combination of breast milk and formula, have various demands. At your child's next checkup, discuss your child's iron needs with the doctor or nurse.
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it is not necessary to isolate an unknown bacterial species in pure culture before making a decision on whether it is pathogenic or not. True or false?
It is necessary to isolate an unknown bacterial species in pure culture before making a decision on whether it is pathogenic or not.
A culture is a collection of microorganisms that has been cultured in a lab. A mixed culture has two or more different types of bacteria, while a pure culture only has one type. A bacterial culture that is kept in the same medium for too long uses up the nutrients and releases harmful byproducts, which finally causes the entire colony to perish. Because of this, it is necessary to periodically transfer or subculture bacterial cultures to new media in order to maintain a growing bacterial population.
Subculturing methods are employed by microbiologists to cultivate and maintain bacterial cultures, to check cultures for purity or morphology, or to count the number of viable organisms. Subculturing is a technique used in clinical laboratories to produce an infectious agent's pure culture and for research that aims to identify the pathogen.
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