A scientist studying the sequence of nucleotides in the rRNA of a bacterial species is working on
A. nomenclature.
B. determining evolutionary relatedness.
C. recombinant DNA.
D. determining if that species is the cause of a new disease.
E. bioremediation.
Answer: B
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When we compare levels of genetic variation in a contemporary African population to that of a contemporary non-African population, we find there is more variation in the African population. The reason we see this pattern is that:
A. non-African populations represent founder events. B. non-African populations have high mutation rates. C. non-African populations experience higher rates of natural selection than do African populations. D. African populations experience higher rates of natural selection than do non-African populations. E. African populations experience high rates of genetic drift.
In contrast to regulators, animals that are conformers:
A. are able to alter their immediate external surroundings in order to maintain homeostasis. B. require large stores of ATP to maintain homeostasis. C. have a feature of their internal body composition that matches their external surroundings. D. cannot live in extremely cold environments, such as the Antarctic Ocean. E. cannot adapt to the external environment.
Why was it not possible to classify viruses by morphology when they were initially discovered?
a. Initially, their morphology could change during infections. b. Once inside the host, they replicate too quickly to be inspected for discernable shape. c. They are too small to be seen with a standard microscope. d. So many of them have identical morphology but different hosts and modes
Volume increases by the ____ of the diameter,
and surface area increases by ____ of the diameter. a. square; doubling b. square; the cube c. cube; the square d. cube; the cube e. none of these is the correct answer