A biologist studied a population of squirrels for 15 years. During that time, the population was never fewer than 30 squirrels and never more than 45. Her data showed that over half of the squirrels born did not survive to reproduce, because of both competition for food and predation. In a single generation, 90% of the squirrels that were born lived to reproduce, and the population increased to 80. Which inference(s) about this population might be true?
A. The amount of available food may have increased.
B. The parental generation of squirrels developed better eyesight due to improved diet; the subsequent squirrel generation inherited better eyesight.
C. The number of predators that prey upon squirrels may have decreased.
D. A and C could be true.
E. A, B, and C could be true.
D. A and C could be true.
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A. At the completion of plant cell mitosis B. At the completion of animal cell mitosis C. In the middle of animal cell mitosis D. In the middle of plant cell mitosis
What factor or factors discovered with electron microscopy distinguished prokaryotic from eukaryotic cells?
a) their size b) their color c) the types of their internal structures or organelles d) their fragility
Paul Ehrlich used chemotherapy to treat
A) cholera. B) cancer. C) anthrax. D) smallpox. E) syphilis.
Which statement reflects the correct order in the synthesis of triacylglycerol?
A. Glycerol 3-phosphate ? diacylglycerol ? phosphatidic acid ? dihydroxyacetone phosphate ? triacylglycerol B. Diacylglycerol ? glycerol 3-phosphate ? phosphatidic acid ? dihydroxyacetone phosphate ? triacylglycerol C. Dihydroxyacetone phosphate ? glycerol 3-phosphate ? phosphatidic acid ? diacylglycerol ? triacylglycerol D. Phosphatidic acid ? glycerol 3-phosphate ? dihydroxyacetone phosphate ? diacylglycerol ? triacylglycerol