Biofilms ____
a. are formed by prokaryotes living in a watery environment
b. may develop on surgical implants
c. are exemplified by dental plaque
d. are formed by prokaryotes living in a watery environment and may develop on surgical implants
e. are formed by prokaryotes living in a watery environment, may develop on surgical implants, and are
exemplified by dental plaque
ANSWER: e
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Insulin is needed to regulate sugar levels in the blood. While every cell in the body contains genes for the production of insulin, it is only produced by a specialized subset of cells in the pancreas. Therefore:
A. every cell must regulate its own sugar production. B. the genes for insulin production must be mutated except in the specialized cells of the pancreas. C. there must be mechanisms of gene regulation that promote insulin expression in the specialized pancreatic cells and prevent insulin expression in all other cells. D. only the specialized cells of the pancreas have functional genes for insulin production. E. insulin production is not regulated because the genes for it are present in every cell.
The slow drifting of sections of the earth's crust, sometimes separating, other times colliding, is known as ________.
A. plate tectonics B. crust dynamics C. continental divergence D. continental convergence
Explain how the mycorrhizae and plant root interaction is considered symbiotic.
What will be an ideal response?
Which of the following statements concerning nucleic acids is CORRECT?
A. Nucleic acid strands are held together by hydrogen bonds between adjacent carbohydrates. B. Cellular DNA is double stranded. C. All viruses have DNA genomes. D. The nucleic acid polymer is composed of peptide bonds. E. There are three naturally occurring purines in nucleic acids.