The molecule below is a(n)
A. glycerol.
B. polypeptide.
C. saturated fatty acid.
D. unsaturated fatty acid.
D. unsaturated fatty acid.
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Because the two strands of a DNA molecule are ________ to each other, either one can be used as a template to reconstruct the other.
A. identical B. antiparallel C. bound D. complementary
You are a genetic counselor, and a couple comes to you with concerns that if they have a child together, he or she
could have hemophilia. The man has an X-linked recessive form of hemophilia, but the woman does not. Genetic tests reveal the woman is not a carrier for hemophilia. How should you advise them?
a. Half of their children will have hemophilia. b. All of their sons and half of their daughters will have hemophilia. c. None of their children will have hemophilia, but all of their daughters will be carriers for hemophilia. d. Each of their sons will have a 50% chance of having hemophilia, and each of their daughters will have a 50% chance of being carriers.
e. All of their sons will have hemophilia, and all of their daughters will be carriers.In replication, once the DNA strands have been separated, reformation of the double helix is prevented by:
a. DNA helicase enzyme. b. single-strand binding proteins. c. DNA polymerases. d. ATP. e. DNA primase.
The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed three-chambered hearts (two atria, one ventricle)
Birds and mammals, however, are alike in having four-chambered hearts (two atria, two ventricles). The four-chambered hearts of birds and mammals are best described as _____. A) structural homologies B) vestiges C) homoplasies D) the result of shared ancestry