Which of the following statements concerning the indirect values of biodiversity is NOT correct?
A. Forests act like a giant sponge, soaking up excess water and releasing it during drier periods.
B. If human impacts on the environment damage or destroy biogeochemical cycles, then technology will have to artificially re-create those cycles.
C. Diverse organisms are critical in breaking down wastes and immobilizing pollutants.
D. Trees take up carbon dioxide and release oxygen when they photosynthesize.
E. All of the choices are correct.
Answer: B
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Meiosis differs from mitosis in that meiosis
(a) requires two cycles of division for completion. (b) produces spores in plants but gametes in animals. (c) is only found in animals and not in plants. (d) both a and b.
Both Streptococcus pyogenes and Corynebacterium diphtheriae are highly pathogenic, and the disease symptomology can be very severe. Why is this?
A. They induce autoimmune states in the patients. B. There are no antibiotics useful for diseases caused by these bacteria. C. Infants and children are the high-risk groups, and their mortality rate is higher than for other ages. D. Both bacteria produce potent exotoxins.
You modify the primary sequence of an enzyme in a region that will be the active site when the protein
is properly folded. What is the predicted outcome of this change?
a. The enzyme will not properly bind to the substrate. b. The enzyme will not be able to bind an allosteric inhibitor. c. The enzyme will have an increased rate of activity. d. There will be no change in the enzyme's function. e. The enzyme will bind the substrate but not be able to release the products.
Which type of plant hormone is primarily responsible for promoting the formation of lateral roots?
a. jasmonates b. gibberellins c. auxins d. systemin e. cytokinins