A time lag in the response of survivorship and fecundity to a population's density can occur because ____ is usually
determined by the availability of resources at some time in the past.
a. death
b. immigration
c. fecundity
d. competition
e. population growth
ANSWER: c
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The following marine biologist was aboard the HMS Beagle in 1831:
a. Edward Forbes. b. Charles Wyville Thomson. c. Alexander Agassiz. d. Charles Darwin. e. Jean-Baptiste Lamarck.
The first step in base excision repair is
A) removal of a double-stranded fragment of damaged DNA. B) nicking the backbone of one DNA strand. C) recognizing and excising the incorrect base from a nucleotide. D) removing extraneous groups such as methyl or oxygen added by mutagens. E) replacing an A-T base pair with a C-G base pair.
The nervous tissue in the central nervous system that consists of neuron cell bodies and dendrites and the synapses is the
A. white matter. B. white corpuscles. C. gray matter. D. red corpuscles. E. red matter.
During which of the following phases of cellular respiration does substrate-level phosphorylation take place?
A) the citric acid cycle B) glycolysis and the citric acid cycle C) "grooming" of pyruvate D) oxidative phosphorylation E) glycolysis