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.
D
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Endospores are
A. resistant to destruction by radiation. B. metabolically inactive. C. resistant to heat and chemical treatments. D. living structures. E. All of the choices are correct.
When a virus persists inside the host in an inactive state, this is specifically referred to as _____
Fill in the blank(s) with the appropriate word(s).
oviductSperm capacitation takes place in the ____
a. testes b. vas deferens c. vagina d. uterus e. oviduct
Which of the following is made from DNA?
a. tRNA only b. mRNA only c. rRNA only d. mRNA and tRNA only e. mRNA, tRNA, and rRNA