A plant physiologist treats a leaf with abscisic acid and observes that the stomata close. What happened inside the guard cells during the experiment?
A. Abscisic acid influences the movement of sodium ions out of the guard cells.
B. Abscisic acid binds with auxins and induces water molecules to exit the guard cells.
C. Abscisic acid binds carbon dioxide and causes carbonate crystals to block the stomatal opening.
D. Abscisic acid influences the movement of potassium ions out of the guard cells.
E. Abscisic acid causes the guard cells to become more turgid.
Answer: D
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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.
A cell that makes up the body structure of an organism and is diploid is _______
A. a gamete B. a somatic cell C. an allele D. rare E. a sperm cell
All clinical specimens submitted to the CML must be:
A) properly and carefully collected. B) properly labeled. C) properly transported to the laboratory. D) all of the above
The Gram-negative opportunistic rod that can grow in a wide variety of environments, including disinfectants and soaps, is
A. E. coli. B. S. aureus. C. S. pyogenes. D. P. aeruginosa.