An oncogene is
A. always seen in human cancer cells.
B. a mutated form of a proto-oncogene.
C. a viral gene with no relation to the host cell's genes.
D. a gene that turns off cellular reproduction.
E. a bacterial gene that causes cancer in the host.
Answer: B
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Which Era are we currently living in?
a. Cenozoic b. Miocene c. Quaternary d. Mesozoic e. Tertiary
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.
Blood in arteries
a. always travels away from the heart. b. travels away from the heart only if it is oxygen rich. c. always travels toward the heart. d. travels from the lungs. e. is always oxygen rich.
According to the Hardy-Weinberg principle, which of the following must be true for gene frequencies in a population to remain the same?
A) Mating is random. B) Mutations occur consistently. C) The population is small. D) Natural selection occurs.