Which of the following statements best describes the effect of mass extinctions and the radiation of new bio-logical diversity?
a. Mass extinctions have no effect on radiations.
b. Mass extinctions prevent potential radiations by eradicating the necessary biological variabil-ity.
c. Mass extinctions provide opportunities for radiations by survivors as dominant groups die out.
d. The overall effect of mass extinctions on radiations depends on the time scale under considera-tion.
D
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Answer the following statement true (T) or false (F)
What kind of bond is formed between successive amino acids during translation?
A) ionic bond B) phosphodiester bond C) hydrogen bond D) disulfide bond E) peptide bond
All of the following are class characteristics of hair except _____, which is individuating.
Fill in the blank(s) with the appropriate word(s).
Which substance, by providing strength, allows sclerenchyma cells to provide support and play a role analogous to that of an animal's skeleton?
A) lignin B) sucrose C) starch D) chlorophyll