Similar gill pouches in embryos of a chick, human, and cat are an example of _____
A) structural homology
B) developmental homology
C) genetic homology
D) the inheritance of acquired characters
Answer: B
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Which of the following statements is NOT true about gamete formation in mammals?
A. In the female, the separation of cytoplasm is unequal during meiosis. B. Only one of the four cells resulting from meiosis goes on to become an oocyte. C. Only one of the four cells resulting from meiosis goes on to become an egg, which becomes a zygote upon fertilization by a sperm cell. D. The polar bodies formed during meiosis in the female can participate in fertilization with sperm. E. The cytoplasm is diminished during development of sperm, and a flagellum is formed to give sperm locomotion.
Atoms or clusters of atoms that are covalently bonded to carbon and influence the behavior of organic
compounds are known as a. functional groups. b. ions. c. acids. d. network solids. e. anhydrides.
Four of the following are viral diseases. Which one is the exception?
A. Herpes B. Measles C. Bubonic plague D. Hepatitis E. Chicken pox
You have isolated a strain of mutant yeast cells that divides normally at 30°C but cannot enter M phase at 37°C
You have isolated its mitotic cyclin and mitotic Cdk and find that both proteins are produced and can form a normal M-Cdk complex at both temperatures. Which of the following temperature-sensitive mutations could not be responsible for the behavior of this strain of yeast? (a) inactivation of a protein kinase that acts on the mitotic Cdk kinase (b) inactivation of an enzyme that ubiquitylates M cyclin (c) inactivation of a phosphatase that acts on the mitotic Cdk kinase (d) a decrease in the levels of a transcriptional regulator required for producing sufficient amounts of M cyclin