Antibiotics kill bacterial cells but do not (usually) damage human cells by taking advantage of the difference between human and bacterial cells. These differences include
A) bacterial cells have cell walls, human cells do not.
B) bacterial ribosomes are larger than those of humans.
C) protein synthesis in bacteria is identical to that in human cells.
D) bacterial cells have a cell membrane, human cells do not.
E) human and bacterial DNA are enclosed in a nucleus.
A
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A eukaryotic ribosome stalled by a non-stop mutation can be rescued by:
A. nonsense-mediated mRNA decay. B. non-stop mRNA decay. C. recruitment of release factors. D. degradation of the ribosome.
Plant hormones _____
a. may have multiple effects c. are active in adult plants b. are active in developing plant embryos d. are all of these
What stimulates activation of B and T cells?
a. cell recognition of an antigen b. production of complement c. histamine production d. lysozyme release e. cytokine production
During translation, translocation refers to
A. joining a tRNA molecule to the ribosome. B. moving the ribosome along the mRNA molecule. C. releasing a tRNA molecule from the ribosome. D. joining an amino acid to the next amino acid in the chain. E. joining an amino acid to a tRNA molecule.