Expression of ______ would inhibit X-inactivation
A. Xic
B. Xist
C. Tsix
D. All of the answers are correct
E. None of the answers are correct
C
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During which one of the following phases of the cell cycle is DNA replicated?
A) G2 phase B) telophase C) metaphase D) S phase E) G1 of interphase
Darwin made which observation while on his four-year voyage on the HMS Beagle?
A. More individuals of a population are born than survive to reproduce. B. Populations grow constantly. C. Organisms are varied and some variations are inherited. D. An individual's chance of survival is random. E. Species do not appear to change over time.
If there are 1,000 metric tons of producers in an ecosystem, about how much of the energy in those producers will be available to secondary consumers in this ecosystem?
A) 100% B) 50% C) about 10% D) about 1% E) about 0.1%
What difference in axonal signaling determines whether we experience a mild or a strong sensation?
A. Action potential threshold B. Conduction speed C. Amount of neurotransmitter released per vesicle D. Frequency of action potentials E. Amplitude of action potentials