An amino acid contains all of the following except a/n ________.
A. variable R group
B. carboxyl group
C. ? carbon
D. phosphate
E. amino group
Answer: D
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Centrioles, cilia, flagella, and basal bodies have remarkably similar structural elements and arrangements. Which of the following hypotheses is most plausible in light of such structural similarities?
A) Cilia and flagella arise from centrioles. B) Loss of basal bodies should prevent cells from dividing in two. C) Motor proteins such as dynein must have evolved before any of these four kinds of structure. D) Cilia and flagella evolved separately in the same ancestral eukaryotic organism. E) Natural selection for cell motility repeatedly selected for microtubular arrays in circular patterns in the evolution of each of these structures.
Which of the following viral components is
NOT typical of a plant virus?
a. RNA b. protein coat c. helical structure d. viral envelope e. more than one of these is NOT typical of a plant virus
Fungi usually obtain food by
A) producing antibiotics that internally destroy bacteria. B) absorbing it and then digesting it within fungal cells. C) chemosynthesis. D) digesting it externally and then absorbing it. E) photosynthesis.
Members of which of the following genera are the most common sexually transmitted bacteria in the United States?
A. Bacteroides B. Rickettsia C. Chlamydia D. Helicobacter E. Treponema