A collection of host cells that house different
cloned fragments of DNA is a
a. cDNA library.
b. transcribed DNA library.
c. genomic library.
d. gene library.
e. plasmid library.
D
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Which category of plant second metabolites includes stimulants like caffeine, nicotine, and cocaine?
A. tannins B. alkaloids C. phenolics D. cyanogenic glycosides E. terpenes
Erythromcycin, a macrolide, inhibits protein synthesis
A. by preventing the formation of the initiation complex. B. by binding to the tRNA preventing peptide bond formation between amino acids. C. by interfering with both the initiation and elongation stages of translation. D. by binding to the ribosome, preventing translocation due to interference with the attachment of mRNA.
Which of the following is a correct statement about sugar movement in phloem?
a) Only phloem cells with nuclei can perform sugar movement. b) Sugar is translocated from sinks to sources. c) Movement can occur both upward and downward in the plant. d) Sugar transport does not require energy. e) Diffusion can account for the observed rates of transport.
Grasses are able to endure grazing by animals because
A. grasses taste bad. B. grasses produce toxic materials in their leaves. C. grasses grow from their base and not from the tips of their leaves. D. grasses grow slowly.