Which step of the Krebs cycle requires both NAD+ and ADP as reactants?
A) step 1
B) step 2
C) step 3
D) step 4
E) step 5
Answer: C) step 3
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A low number of methyl groups associated with a gene encoding a hormone that fosters prenatal growth and
development is common in individuals a. with cancer. b. conceived during famine. c. exposed to chemicals in cigarette smoke. d. with young parents. e. of certain ethnic groups.
In order to learn about the relationships among populations, we would need to examine the variation in DNA caused simply by ________.
A. mutation B. natural selection C. genetic drift D. geography
Which of the following is TRUE of both T cells and B cells?
A. They have class I MHC molecules on their cell surface. B. They recognize specific antigens on the cell surface. C. They are involved in the humoral immune response. D. They are lymphocytes. E. All of the responses are correct.
In birds and reptiles, waste ammonia is usually converted to ____, which uses great amounts of energy but yields the greatest water savings.
A. uric acid B. protein C. carbohydrates D. carbon dioxide E. glucose