The general name for enzymes that catalyze RNA synthesis directed by a DNA template is:
A. RNA synthetase.
B. RNA polymerase.
C. polynucleotide phosphorylase.
D. RNase.
E. DNA polymerase.
B
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Which hormone requires iodine for its proper function and in excess will increase metabolic rate?
A. cortisol B. growth hormone C. insulin D. thyroid hormone E. atrial natriuretic peptide
Lederberg and Tatum used the bacterial strains bio- met- leu+ thr+ thi+ and bio+ met+ leu- thr- thi- in their
experiments to determine if genetic recombination occurs in bacteria. Would it have been better to use two strains with the genotypes met- leu+ and met+ leu- instead?
a. Yes, because it is easier to study 2 genes than 5 genes. b. Yes, because the met- leu+ and met+ leu- strains only have one mutation, which makes it easier for genetic recombination to occur. c. No, because the met- leu+ and met+ leu- strains only have one mutation. A single random mutation could restore methionine or leucine synthesis in the strains. d. No, because strains with only one nutrient-deficient gene can still grow on minimal medium. e. No, because cells have two genes that encode different versions of leucine, so the met+ leu- strain would still be able to grow on minimal medium.
All flagellated protozoans _____
a. lack mitochondria c. live as single cells b. are photosynthetic d. cause disease
Runners are modified stems that resemble
roots and are also known as a. stolons. b. rhizomes. c. bulbs. d. corms. e. tubers