Which scenario best illustrates the process of natural selection?
A. a population of mosquitoes develops resistance to a pesticide.
B. a plant loses its leaves in a drought.
C. a population of foxes increases as more prey becomes available.
D. a bear learns to find food at a garbage dump.
E. a chameleon's color changes to brown as it sits on a log.
A. a population of mosquitoes develops resistance to a pesticide.
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Although Edward Jenner was not the first to use vaccination procedures to prevent disease, he was the first to document such procedures.
a. true b. false
Why is there a problem replicating the ends of linear DNA?
A. Leading strand synthesis primed at the replication origin of a linear DNA can't remove and replace the primer. B. Lagging strand synthesis primed at the ends of a linear DNA can't be removed and replaced because there is no 3'-OH available. C. Since replication only initiates at the ends of linear DNA, the priming of each leading strand leaves a primer at the end that cannot be removed. D. Okazaki fragments are generated along both strands but DNA ligase is inhibited by the Tus-Ter complexes at the ends of the DNA. E. Primase cannot copy telomere DNA.
When the centers of tubercles break down into ________ lesions, they gradually heal by calcification that replaces normal lung tissue.
A. necrotic caseous B. granuloma C. secondary D. tertiary E. primary
Tetrad analysis shows that crossing-over occurs at the four-strand stage (i.e., after replication) because, when two genes are linked,
A) NPD > T. B) T > NPD. C) T > PD. D) PD > NPD. E) PD > T.