Pollen tubes
A. transport pollen to the stigma.
B. facilitate the growth of pollen.
C. package sperm into pollen granules.
D. allow sperm to fertilize the egg.
E. are present during spermatogenesis.
D. allow sperm to fertilize the egg.
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As recently as the 1980s, the medical establishment believed ulcers to be caused by stress and an increase in gastric acidity. How has the current understanding of ulcer development changed patient treatment?
A. There is no treatment for ulcers, then or now. B. Antibiotics are now used to treat ulcers. C. Different foods are now suggested for patients having ulcers. D. Doctors now give their patients sedatives to calm patients with ulcers.
Endocrine cells in the pancreas are responsible for which of the following?
a. Regulating blood-glucose levels b. Stimulating metabolism c. Promoting the growth of body tissues d. Stimulating water reabsorption by the kidneys
Ergotism _____
a. results from inhalation of fungal spores b. produces hallucinations and convulsions c. affects only those with weak immune systems d. all of the above
A mutation in a gene that changes a codon to one that codes for the same amino acid as the original codon; The amino acid sequence of the resulting polypeptide is thus unchanged
What will be an ideal response?