Chromatin consists of ____
a. only DNA
b. DNA and RNA
c. RNA only
d. DNA and associated proteins
e. proteins only in the nucleus
ANSWER: d
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A common organism of the temperate infralittoral fringe (lower intertidal) is called:
a. Laminaria. b. Entermorpha. c. Ulva. d. lichen. e. giant kelp.
Life history patterns of guppies in Trinidad are a result of which natural selection force?
a. Competition differences in different streams. b. Predation differences in different streams. c. Temperature differences in different streams. d. Pollution differences in different streams. e. Salt concentration differences in different streams.
The first barrier to invasion is
a. antibody production. b. intact skin and body cavity linings. c. direct attack by white blood cells. d. innate immunity. e. development of memory cells.
Natural selection drives evolution through the following forces except
A. competition for food. B. predators. C. climate. D. reproduction. E. competition for mates.