Which of the following is not a major functional class of proteins?
A) trifunctional proteins
B) enzymes
C) motility proteins
D) regulatory proteins
E) structural proteins
A) trifunctional proteins
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If a cell in the root tip of a plant had no functional CDK2 gene product, which of the following would
be true?
a. The cell would be able to undergo DNA replication. b. The cell would be able to enter G2. c. The cell would be able to enter G1. d. The cell would be able to enter mitosis. e. The cell would be able to complete the cell cycle.
What is the most serious drug problem on U.S. college campuses?
a. binge drinking b. cocaine c. marijuana d. methamphetamines
Unlike eudicot roots, the center of most monocot roots is occupied by the:a
cortex. b. pith. c. phloem. d. vascular cambium. e. xylem.
Leptin is a circulating hormone that is produced by fat cells and plays a role in body metabolism and obesity. It normally binds to receptors in the brain and inhibits appetite. Studies have demonstrated that when obese mice that are leptin deficient are injected with leptin they quickly lose their excess weight. Interestingly, however, many overweight people have high levels of leptin in their bloodstream. Why do you think that the high levels of leptin in obese individuals are insufficient to curb their appetite?
A. The form of leptin released by obese people may lack protein kinase activity. B. Paracrine signaling may be disrupted in obese people with high levels of leptin. C. Obese people who have high levels of leptin may have a leptin receptor with decreased sensitivity. D. In obese people with high levels of leptin, the leptin is a nonfunctional second messenger.