Hereditary nonpolyposis colon cancer (HNPCC) requires only one mutational step to initiate the formation of a cancer cell
a. True
b. False
Indicate whether the statement is true or false
False
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Barbiturates and benzodiazepine drugs bind to GABA receptors to open chloride channels, inhibit neural impulse, and
induce tranquility. __________________ Indicate whether the statement is true or false.
Pea plants are self-pollinators. What can you further deduce about peas? (Check all that apply.)
A. Peas will be more resistant to new plant diseases. B. Peas will be more resistant to garden pests than other plants. C. To perform his pea cross-pollination experiments, Gregor Mendel must have first removed the stamens from flowers to prevent self-pollination. D. Peas are less likely to invade highly variable natural environments than other plants. E. A gardener planning to collect heirloom seeds can plant different varieties of peas near each other.
During ecological succession, the species composition of a plant community generally
A) changes from a diverse community in which many plants are common to one in which a few species are numerically dominant. B) remains stable as long as climate and human interference remain constant. C) changes gradually because each species responds differently to the changing environment. D) changes until forest is established and a single species of plant remains.
Which membrane component is important for allowing large, charged molecules to pass through the membrane?
A. glycosylated lipids B. carbohydrate channels C. cholesterol D. peripheral proteins E. transmembrane proteins