Which of the following best describes the addition of nucleotides to a growing DNA chain?
A) A nucleotide triphosphate is added to the 5' end of the DNA, releasing a molecule of pyrophosphate.
B) A nucleotide triphosphate is added to the 3' end of the DNA, releasing a molecule of pyrophosphate.
C) A nucleotide diphosphate is added to the 5' end of the DNA, releasing a molecule of phosphate.
D) A nucleotide diphosphate is added to the 3' end of the DNA, releasing a molecule of phosphate.
E) A nucleotide monophosphate is added to the 5' end of the DNA.
Ans: B) A nucleotide triphosphate is added to the 3' end of the DNA, releasing a molecule of pyrophosphate.
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Polydactyly is a dominant trait that results in extra fingers and toes in humans. A man with polydactyly marries a woman with 10 fingers and toes. They have a child that has a normal number of digits. The phenotype of the man's father is unknown, but his mother has a normal phenotype. What are the genotypes of the married couple? (D = polydactyl allele; d = wild type allele)
A. woman Dd, man dd B. woman DD, man dd C. woman dd, man DD D. woman dd, man Dd E. woman DD, man Dd or dd
Under what circumstance might measuring the frequency of homozygous recessive genotypes lead to
erroneous predictions of allele frequencies in a population?
a. the population is under Hardy-Weinberg equilibrium b. the population is affected by heterozygote advantage c. the population has undergone genetic drift in the past d. the population is in a stable phase of punctuated equilibrium e. the population is affected by frequency-dependent selection
The giant squids of the deep sea remain a mystery because we lack knowledge of:
a. what they feed on. b. their exact size. c. their distribution. d. their anatomy. e. the identity of their predators.
The structure labeled "2" in the figure is a(n) ____
a. mycelium b. zygote c. ascus d. gill from the underside of a mushroom e. spore sac