How does a tRNA know which amino acid to add to the growing peptide chain during translation?
a. The rRNA tells the tRNA which amino acid to bring to the ribosome.
b. The DNA tells the tRNA which amino acid to bring to the ribosome.
c. The codon on the tRNA and the anti-codon on the mRNA are complementary.
d. The codon on the mRNA and the anti-codon on the tRNA are complementary.
d. The codon on the mRNA and the anti-codon on the tRNA are complementary.
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During periods of stratification, transfer between surface and bottom waters is controlled by
A) mixing. B) diffusion. C) niche partitioning. D) current.
Mistletoe is a plant that grows commonly on
the limbs of hawthorn trees and extracts nutrients from its host plant. The relationship between mistletoe and the hawthorn tree is
a. commensalism. b. mutualism. c. competition. d. predation. e. parasitism
In a bacterial species genes q, r, s, and t were mapped in minutes through interrupted mating experiments. The results placed q and s on the two outer ends, but r and t were not resolvable by minutes
You have discovered no phage that can infect this species. If you have a q r s t Hfr strain and a q- r- s- t- F- strain, how could you measure the distance between the genes in map units?
Which types of phenotypic ratios are likely to occur in testcrosses when dealing with two gene pairs for which all the genotypic combinations are of equal viability?
A) 9:3:3:1, 27:9:9:9:3:3:3:1 B) 2:3, 1:2 C) 1:1:1:1 D) 12:3:1, 9:7 E) 1:2:1, 3:1