The PCR technique requires a DNA polymerase from an organism that can endure high heat, such as Thermus aquaticus. What step of the protocol makes the heat-stability most necessary?
A. Synthesis
B. Denaturation
C. Primer annealing
D. Antibody binding
Answer: B
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Which of the following words describes a
tentative explanation to a given question?
a. law b. theory c. hypothesis d. fact e. principle
A strain is
a. a subdivision within a family that has a characteristic trait or traits. b. a subgroup within a species that has a characteristic trait or traits. c. a group within a branch that has a characteristic trait or traits. d. a group within a phylum that has a characteristic trait or traits. e. a subgroup within a domain that has a characteristic trait or traits.
What potential consequence on the cardiovascular system may result from smoking?
A) an increase in the production of HDL B) a decrease in the production of LDL C) a higher risk of atherosclerosis D) an increase in the risk for lung cancer
Researchers studying groupies in Trinidad found that guppies in streams with high predation reproduced earlier and more frequently. Which of the following is most important in driving the guppies to change their life history in face of predation?
A. The guppies are an equilibrium species. B. The guppies are an opportunistic species. C. Density-independent factors affects the guppy populations. D. Density-dependent factors affects the guppy populations. E. Sexual selection affects the guppy populations.