Phytochrome is converted from the inactive to the active form by being exposed to light of what color?
a. far red
b. red
c. yellow
d. blue
e. violet
ANSWER: b
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What conclusions are consistent with these data? (Select all that apply.)
A researcher is studying the rII locus of phage T4. Three rII- strains are obtained: A, B, C, and D. In the first experiment, E. coli strain K(?) is coinfected with two rII- strains simultaneously and the results are recorded. Infection with A and B phage = plaques form Infection with A and C phage = plaques form Infection with B and C phage = no plaques form Infection with B and D phage = no plaques form Infection with C and D phage = no plaques form In a second experiment, coinfections are performed first in E. coli strain B, then the progeny phage are used to infect E. coli strain K(?). Progeny of A and B phage = plaques form Progeny of B and C phage = plaques form Progeny of C and D phage = plaques form Progeny of B and D phage = no plaques from A) Strains B and D both carry the same mutation. B) Strains B, C, and D carry mutations in the same gene. C) Strain A carries a mutation in a different gene than strains B, C, and D. D) Strains A and B carry mutations in the same gene. E) Strains B and C both carry the same mutation. F) A, B, C, and D carry mutations in the same gene.
Glomerular capillary walls and podocytes form a ____ that allows fluid and small solutes in plasma to pass through
and become part of the filtrate. a. glomerular filtrate b. tubular transport c. renal threshold d. filtration membrane e. filtration slits
Sexual reproduction appears to be absent in bdelloid rotifers. Which of these, if found in this group, would bring into question the idea that they reproduce ONLY asexually?
A) female rotifers with eggs B) significant differences of two different alleles among different populations (one population having mostly allele A and one having mostly a). C) cells in which meiosis occurs D) related groups (not bdelloid rotifers) which reproduce both sexually and asexually.
Nucleotides are the units of
A. ATP B. DNA and RNA C. Proteins D. Histones E. Carbohydrates