Cells sometimes use methylation: (Select all correct choices)
A. to prevent the expression of genes in
transposable elements.
B. to prevent the expression of genes from
viruses that have been integrated into the
genome.
C. to prevent the expression of harmful
(mutant) genes such as those responsible for
cystic fibrosis.
A,B
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Conifer sporophytes are longer-lived, and anatomically and morphologically more complex than other gymnosperms
a. True b. False
How does Helicobacter pylori cause gastric ulcers in humans?
A) It neutralizes the acids of the stomach. B) It causes the production of excess acid in the stomach. C) It damages the stomach's mucus coat. D) It causes the stomach to produce stronger acids.
Which of the following substances are commercially produced by fungi?
A. cheese B. citric acid C. wine D. some antibiotics E. All of the choices are correct.
Why do we distinguish between inter- and intraspecific mutualism?
a. This distinction is for historical reasons only. b. Mutualistic partners in the same species are part of the same gene pool. c. The mutualistic partners do not benefit equally in interspecific mutualism. d. Only intraspecific mutualism gives the opportunity for cheating.