With regard to reproduction, which is correct about SRY?
A. It is a protein that is normally coded for by a gene that is present on the Y chromosome.
B. It is a gene that codes for testosterone.
C. It is a protein that causes the degeneration of the Wolffian ducts.
D. It is a gene found in both males and females.
E. It is a protein normally coded for by a gene that is present on the X chromosome.
A
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During aging or apoptosis, the structure and function of the organelles and chromosomes undergo many degenerate changes.
a. true b. false
The intrinsic nerve plexuses
a. produce spontaneous depolarization of the smooth muscle cells in the wall of the digestive tract. b. are located in the mucosa. c. coordinate local activity in the digestive tract. d. both (a) and (c) above. e. all of these answers.
Which of the following descriptions best represents the appearance of the sarcomere during peak contraction?
A. The I bands and A bands are of equal widths. B. The width of the A band is slightly less than the width of the I band. C. The H zone is equivalent to one-third of the length of the A band. D. The H zone is eliminated, and the I bands are very thin.
In children born without a thymus, which would be the most serious symptom?
A. Poor lymphatic return from the left arm. B. Elephantiasis of the lower limbs. C. A very low population of T lymphocytes. D. A very low population of B lymphocytes.