In the process of blastula formation,
a. the size of individual cells decreases.
b. the number of cells increases.
c. the total amount of cytoplasm remains about the
same.
d. the blastula is the same size as the zygote.
e. all of these occur.
Answer: e
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The activity of Rb is controlled by
A) its phosphorylation state. B) cyclin A. C) E2F. D) its poly-A tail. E) its level of methylation.
A rapidly growing population is indicated by
a. A. b. B. c. C. d. D. e. none of these.
On the landmass that became South America
a. monotremes were replaced by marsupials and early placental mammals starting about 65 million years ago. b. highly evolved placental mammals radiated south from North America about 5 million years ago. c. many early placental mammals became extinct in the Pliocene. d. early placental mammals arose between 130 and 85 million years ago. e. all of these occurred.
Which of the following statements about lymphocytes is FALSE?
A) Once they are mature, they migrate to secondary lymphoid organs. B) B and T lymphocytes can be differentiated under the bright-field light microscope. C) Lymphocytes have integral surface proteins by which they can be recognized. D) The glycoproteins on the surface of a lymphocyte are designated with the prefix CD, for "cluster of differentiation." E) Lymphocytes have different types of CD molecules in their cytoplasmic membranes.