A primary difference in the age pyramids of industrialized versus developing countries is that:
a. third-world countries show a characteristic "bulge" that indicates a baby boom.
b. third-world countries have significantly more individuals than industrialized countries.
c. third-world countries have much larger proportions of their population in the youngest age group.
Ans: c. third-world countries have much larger proportions of their population in the youngest age group.
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Which of the following statements are true regarding the secondary immune response? Select all correct choices
A. It occurs more slowly than the primary immune response. B. It occurs faster than the primary immune response. C. It produces more antibodies than the primary immune response. D. It produces fewer antibodies than the primary immune response.
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.Compared to the Asian fisheries industry, the U.S. fishing industry efficiently utilizes almost all of the fish catch and almost all parts of a fish
Indicate whether the statement is true or false
After obtaining DNA fragments by PCR, the
fragments are
a. separated by a centrifuge. b. viewed under a microscope. c. separated by an electric current. d. inserted into a plasmid. e. chopped up using restriction enzymes