CREB is activated by
a. cAMP binding in the nucleus.
b. phosphorylation by protein kinase A in the nucleus.
c. cAMP binding in the cytoplasm.
d. phosphorylation by protein kinase A in the cytoplasm.
Ans: b. phosphorylation by protein kinase A in the nucleus.
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World human population in 2009 is approximately
A. 670 million. B. 1.8 bilion. C. 4.6 billion. D. 6.7 billion. E. 10 billion.
Which of the following is a characteristic of temperate forests?
a. deciduous trees b. evergreen conifers c. infrequent precipitation d. diversity of tree species
By definition, a nerve is
a. a bundle of axons. b. a single extension of a neuron. c. the same as a neuron within the central nervous system. d. a dendrite. e. a fiber more than 10 inches in length.
While looking under a microscope, you see two neighboring daughter cells. One of the cells contains three chromosomes, and the other contains five. The parent cell normally contains four chromosomes. What could be the reason for the different number of
chromosomes in the cells? A) Replication of DNA did not occur properly. B) The nuclear envelope did not dissolve, so mitosis could not occur at all. C) The division of sister chromatids of one chromosome did not occur properly during mitosis. D) The division of homologous chromosomes during meiosis II did not occur properly.