Chromosomes can be condensed into compact structures, visible with the light microscope, but usually only:
A. while the proteins are being assembled.
B. during cell division.
C. while the DNA is being copied into RNA.
D. while the nuclear pores are open.
E. after the cell is dead.
Answer: B
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Which of the following serve as examples of morphological convergence?
a. sharks, penguins, and porpoises b. panthers and tigers c. apes and monkeys d. sharks, skates, and rays e. mice, rats, and gerbils
In plant cells, chloroplasts are found ____
a. on the cell membrane b. in the cytoplasm of the cell c. in the stroma d. in the thylakoids e. in the central vacuole
Testosterone exerts _______ feedback on secretion of luteinizing hormone.
Fill in the blank(s) with the appropriate word(s).
Which of the following is a potential advantage of introducing apomixis into hybrid crop species?
A) Cultivars would be better able to cope with a rapidly changing environment. B) They would have a larger potential genome than inbred crops. C) All of the desirable traits of the cultivar would be passed on to offspring. D) They would benefit from positive mutations in their DNA.