Which one of the following statements about DNA is incorrect?
A. DNA typically exists in cells as a double helix.
B. There are 10 base pairs per turn in a helical DNA molecule.
C. DNA has a diameter of approximately 2 nanometers.
D. The strands in DNA wrap around each other in a helix that coils to the right.
E. All of the statements about DNA are correct.
Answer E
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A genetic counselor might discuss assisted reproductive technologies with a couple who wish to
A) adopt a child. B) avoid passing on a disease-causing allele to a child. C) avoid cancer in their children. D) have a child who will excel at a particular sport or have a particular talent.
Prokaryotes produce proteins faster than eukaryotes. Which of the following does not apply to this concept?
(A) Transcription and translation are coupled due to a lack of a nuclear membrane in prokaryotes (B) Prokaryotes do not have introns to splice out as eukaryotes do (C) Prokaryotes do not add a poly-A tail post-transcription (D) Prokaryotes can skip transcription and go directly into translation
A harmless insect that looks like a dangerous one in order to fool its predators is an example of _______.
a) parasitism b) mutualism c) mimicry d) camouflage
Diane Dodd's experiments using fruit flies demonstrated that
A) the evolution of reproductive barriers occurs much too slowly to produce measurable effects in the laboratory. B) new species can form in a single generation by the production of new reproductive structures. C) formation of a reproductive barrier between two populations is more likely if they experience and adapt to different environmental conditions. D) reproductive barriers usually are absolute: Either two populations are fully willing and able to interbreed, or they are strictly separated by a fully effective reproductive barrier.