DNA replication is a complex and ungoverned process, and, as a result, the frequency of error is quite high.
Answer the following statement true (T) or false (F)
False
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Which of the following statements about natural selection is true?
a. Natural selection causes variations to arise within a population. b. Natural selection leads to increased likelihood of survival for certain individuals based on variation. The variation must come from outside the population. c. All individuals within a population have an equal likelihood of survival. Survival is based on chance. d. Natural selection results in those individuals within a population who are best-adapted surviving and producing more offspring. e. Natural selection leads to extinction.
The first tetrapods evolved
a. on land. b. after the amphibians. c. in water. d. after the first amniotes. e. from the ray-finned fishes.
B cells develop and mature in the __________.
What will be an ideal response?
Alpha and beta interferons
A. help protect virus-infected cells from the effects of the pathogen. B. protect the cells that secrete them from being invaded by a virus. C. are produced by infected fibroblasts and macrophages. D. produce active antiviral proteins (AVPs) that coat the surface of healthy cells and prevent the attachment of pathogenic viruses. E. produce no adverse effects in the body.