Sucrose moves into a cell against its concentration gradient at the same time that protons move into the cell along their concentration gradient. This is an example of ____.
a. symport
b. passive diffusion
c. antiport
d. facilitated diffusion
e. active transport
ANSWER: a
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The process of evolutionary changes that result in formation of new species and groups of species is called
A. temporal evolution. B. artificial selection. C. macroevolution. D. serial evolution. E. a combination of temporal and serial evolution.
Many introduced species have deleterious effects on communities and ecosystems because ____
a. coevolved parasites and pathogens are absent b. the introduced species are long-lived c. predators prefer the introduced species, resulting in proliferation of native prey species d. the community from which they came lost an important predator, competitor, or parasite e. human beings do not know how to appreciate them
About __________ of the genes in a mouse have a similar gene in humans
a. 10%. b. 25% c. 50% d. 90% e. 99%
Fluorescent Microscopy
A. uses light beams that are deflected by a different thickness of the object and are reflected when they strike the objective B. is used to observe viruses and the internal structure of thinly sectioned cells C. is used to observe a specimen that emits light when illuminated with an ultraviolet light D. is used primarily to view spirochetes