DNA replication is highly accurate. It results in about one mistake per billion nucleotides. For the human genome, how often would errors occur?
A) on average, once or twice in the lifetime of an individual
B) on average, six times each time the entire genome of a cell is replicated
C) on average, once every six cell divisions
D) on average, once a lifetime in 10 percent of the population
Answer: B
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Inversions are most likely to affect an organism's phenotype
A) if one or both of the inversion's breakpoints lies within the transcribed region of a gene. B) if the inversion's breakpoints are on either side of a gene and its regulatory regions and the entire gene is reversed in the genome. C) if the inversion is pericentric. D) if the inversion is paracentric. E) if the inversion is small.
If a respiratory surface dries out, gas exchange will
A) decrease for carbon dioxide but increase for oxygen. B) not occur. C) increase. D) decrease for oxygen but increase for carbon dioxide. E) not be affected.
Plasmodium falciparum is a protozoan that:
A) causes malaria. B) causes intestinal distress. C) can switch between plant and animal lifestyles. D) is closely related to fungi.
DNA contains ____ nucleotides; they are _____________.
A) 4; adenine, cytosine, uracil, and guanine B) 4; adenine, cytosine, thymine, and guanine C) 20; tryptophan, alanine, glycine, methionine, and 16 others D) 3; glucose, fructose, and lactose E) 2; saturated and unsaturated