Which of the following statements is true of viruses?
What will be an ideal response?
They cannot live outside of a cell; they must enter a living cell to survive.
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An individual usually expresses ________ structurally distinct allele(s) that encode class I MHC proteins
A) one B) two C) four D) six
Ecosystem ecology is primarily concerned with
A. ecosystem stability. B. interactions among species. C. the synthesis of new forms of nutrients. D. patterns of species diversity. E. movement of energy and materials through organisms and their communities.
The main role of myoglobin in muscle fibers is to ____
a. magnify responses to neurotransmitters b. sequester ions c. synthesize ATP d. store oxygen e. enhance the strength of the power stroke
What happens to phytochromes after several days of dark, rainy weather?
A) Pr and Pfr become unstable and both are destroyed. B) Pr and Pfr are both formed from inactive phytochrome. C) Pr stimulates flowering. D) Pfr spontaneously reverts to Pr. E) Pr absorbs darkness and converts to Pfr.