Polypeptide antibiotics that act as detergents and distort bacterial cellular membranes do so by:
A) acting as antimetabolites
B) inhibiting cell wall synthesis
C) disrupting cell membrane function
D) inhibiting nucleic acid synthesis
Ans: C) disrupting cell membrane function
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What is the right sequence of events applied in the scientific method?
a. hypothesis; initial observation; data analysis; test; conclusion b. initial observation; data analysis; hypothesis; test; conclusion c. initial observation; hypothesis; data analysis; test; conclusion d. initial observation; hypothesis; test; data analysis; conclusion e. hypothesis; data analysis; initial observation; test; conclusion
The actions of insulin and glucagon could be described as
a. synergistic. b. antagonistic. c. cooperative. d. permissive. e. mutualistic.
The molecule that carries each amino acid to its correct position along mRNA in the cytoplasm is
A. tRNA. B. mRNA. C. ATP. D. ribosomal RNA.
It has been recently determined that the gene for Duchenne muscular dystrophy (DMD) is more than 2000 kb (kilobases) in length; however, the mRNA produced by this gene is only about 14 kb long. What is a likely cause of this discrepancy?
A) The introns have been spliced out during mRNA processing. B) More amino acids are coded for by the DNA than by the mRNA. C) The DNA represents a double-stranded structure, whereas the RNA is single-stranded. D) When the mRNA is produced, it is highly folded and therefore less long. E) The exons have been spliced out during mRNA processing.