Older roots become thick and woody through the buildup of ____
a. periderm
b. meristem
c. cork cambium
d. vascular cambium
e. pericycle
ANSWER: d
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If you were reading off the sequence of amino acids in the figure to a biologist friend, what should the first three letters be?
A) M-N-G B) A-P-A C) It does not matter, since the protein has no polarity or directionality.
The situation in which an active regulatory protein "turns off" gene expression is an example of
A) a mutation. B) positive control. C) negative control. D) constitutive gene elements. E) unique regulation.
Huntington’s disease (HD) is a neurodegenerative genetic disorder involving an autosomal dominant mutant allele with high penetrance. If a father’s mother had HD, what is the probability that his first child will also have HD?
a. It depends on whether the father has the allele. b. It depends on whether the trait is recessive. c. 0.5 or 50% d. 0.25 or 25%
In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over
spotted (s). If a red, spotted male was crossed with a black, solid female and all the offspring from several crosses expressed only the dominant traits, the genotype of the female would be a. BB SS. b. Bb SS. c. Bb Ss. d. BB Ss. e. none of these.