The chemical reactions in cells are called ____
a. substrate
b. coenzymes
c. receptor sites
d. metabolism
e. active site
ANSWER: d
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Considering solutions with the following pH, which is alkaline?
A. 8 B. 7 C. 6 D. 5 E. All are alkaline.
A recessive allele in tigers causes the white tiger. If two normally pigmented tigers are mated and produce a white offspring, what percentage of their remaining offspring would be expected to have normal pigmentation?
A) 25% B) 50% C) about 66% D) 75% E) about 90%
Electron microscopes have an advantage over light microscopes because
a. electron microscopes allow the viewer to examine living cells. b. electron microscopes have a larger objective aperture. c. electron microscopes are easier to use. d. the wavelength of electrons is shorter than that of light.
Which example is most clearly a case of density-dependent population regulation?
A) the summer drying of savanna grass for an insect that feeds on grass sap B) a dangerous new flu strain that is transmitted among humans by sneezing C) the first hard frost of fall for a population of annual morning glory vines D) the occurrence of rainstorms for an opportunistic desert annual