the series of events that a cell undergoes from the time it forms until the time it divides
What will be an ideal response?
the cell cycle
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Infectious mononucleosis is caused by the Epstein-Barr virus, and patients often exhibit a fever, sore throat, swollen glands, and fatigue for several weeks. In some patients, the virus can reactivate later and cause physical symptoms once again
This is likely because A. they were misdiagnosed the first time, and only really were infected by the virus the second time they became sick. B. the virus was latent in these patients, and then switched to the active form and began making new virus particles C. the patients had the virus initially, and they became sick again at the time the virus became latent. D. the Epstein-Barr virus is an emerging virus so we do not know much about its infectious life cycle.
The signaling molecule nitric oxide (NO) functions
a. by binding its cell surface receptor and triggering an intracellular signaling cascade. b. by diffusing across the membrane and binding its intracellular receptor, which then activates transcription. c. on cells located far from the cells where it was synthesized. d. by diffusing across the cell membrane and changing the activities of intracellular enzymes.
Researchers in England found that, for three out of four habitat types they were studying, the most efficient strategy was to create a system of stepping stones linking existing habitat clusters. "Stepping stones" are a type of corridor.
Answer the following statement true (T) or false (F)
Which of the following is most likely to be true about the mouse and rat myosin genes?
A. The nucleotide sequences are identical. B. There is no homology between the two sequences. C. The genes are similar in sequence, but not identical. D. The genes encode proteins with different functions. E. The genes encoding myosin closely resemble those encoding actins.