Select all molecules secreted by cytotoxic T cells that are involved in killing of target cells.
A) antibodies
B) complement
C) interferons
D) granzymes
E) perforin
Answer: D & E.
D) granzymes
E) perforin
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Temperature is perhaps the most important factor in the distribution of organisms because
A. water is scarcer in warmer environments. B. most organisms are unable to regulate their body temperature precisely. C. many organisms are able to grow faster in warmer climates. D. the metabolic optimum for endothermic animals is in temperate areas. E. wind amplifies the effect of cool temperatures.
To be useful to scientists, a hypothesis must be ________; in other words, the hypothesis must be able to be confirmed or discredited
Fill in the blank with correct word.
Enzymatic digestion of proteins starts in the
A. mouth. B. esophagus. C. stomach. D. small intestine.
A year ago, Kurt lost 30 pounds quite rapidly by severely restricting his calories. Over the months following, he has regained 25 of those pounds. Kurt again cuts radically back on his calorie intake to lose the regained weight. This time, he is having
more difficulty. What has happened to his body composition and his metabolism to create this difficulty? What will be an ideal response?