L-amino acids occur in proteins and are designated
A. unnatural.
B. natural.
C. rare.
D. left handed.
E. natural AND left handed.
E
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The oxygen needed for respiration moves from the lungs and into capillaries by simple diffusion. Once in the capillaries, what molecule or other component of blood is responsible for transporting oxygen in the circulatory system?
A. There is no transport molecule; oxygen remains free in the blood. B. white blood cells C. hemoglobin D. cadherins
Why are conditional knockout animals desirable?
A) Genes that are essential for development can be deleted in the adult or only in specific tissues. B) Animal cell lines with deletions can be created. C) They are easier to create than standard knockout animals. D) The mutations they create are more stable than those created by standard knockout techniques.
Antennapedia and bithorax belong to the class of mutants referred to as atavistic mutants
Indicate whether the statement is true or false
Which is NOT true of human salivary glands?
A. The production of saliva aids in the mechanical digestion process. B. They produce an enzyme to begin the digestion of starch. C. They can become inflamed and cause tonsillitis. D. There are three pairs that open by ducts into the mouth.