Do you think that the altered amino acid sequence in sickle-cell betaglobin could alter the overall structure of hemoglobin?
a. No, a single amino acid substitution is too small of a change to affect a largeprotein
b. Yes, a single amino acid substitution could radically affect the overall structure ofhemoglobin.
b
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Which of the following linkages would you expect to find at a branch point in glycogen or amylopectin?
A) ?-1,4-glycosidic linkage B) ?-1,4-glycosidic linkage C) ?-1,6-glycosidic linkage D) ?-1,6-glycosidic linkage
Cholera toxin causes intestinal cells to secrete large amounts of electrolytes, resulting in a very watery diarrhea.
Answer the following statement true (T) or false (F)
It is likely that vestigial traits remain in place for some organisms when they serve no current functions be-cause:
a. the trait is not costly to the organism. b. natural selection does not act against the trait. c. there is some natural selection against the trait—it is on its way out and will eventually be lost. d. All of the above.
The idea that life evolves from simple to complex began with:
a. Darwin. b. William Bateson. c. the ancient Greeks. d. J. F. Meckel. e. Etienne Serres.