Which event probably made the evolution of cellular respiration possible?
a. accumulation of carbon dioxide in atmosphere
b. emergence of prokaryotes
c. accumulation of oxygen in atmosphere
d. emergence of eukaryotes
e. emergence of plants
ANSWER: c
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Island arcs are associated with:
a. midocean ridges. b. continental shelves. c. continental slopes. d. deep sea trenches.
The nonfunctional form of a gene is called a wild-type allele
Indicate whether the statement is true or false
If a plant's stomata were always closed, how would this affect the plant's ability to make glucose?
A. Plants would be able to make more sugar than normal. B. Plants would make less sugar than normal. C. There would be no effect on the ability of the plant to make glucose.
An available quadrivalent or nine-valent vaccine protects against infection by
a) HSV type 1. b) HSV type 2. c) HIV. d) HPV.