10,000 kcal of producer could support approximately _____ kcal of tertiary consumer.
a. 1,000
b. 100
c. 10
d. 1
e. 0
Answer: c. 10
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As electrons are passed through the system of electron carriers associated with photosystem II, they lose energy. What happens to this energy?
A) It excites electrons of the reaction center of photosystem I. B) It is lost as heat. C) It is used to establish and maintain a proton gradient. D) It is used to phosphorylate NAD+ to NADPH, the molecule that accepts electrons from photosystem I.
In the selfish herd, there is an advantage to
a. being on the outside. b. being near the front. c. being in the middle. d. being isolated. e. none of these; position is of no advantage.
Farmers sprayed litchi trees to suppress populations of scale insects. However, the spray also killed populations of a predatory lacewing that controlled the scales. Soon the spraying did no good, and the damage to the litchi from the scales was greater than before spraying had occurred. Few predatory lacewings exist in the trees now because
A. the scale insect was r-selected and the high number of young included a resistant strain; the predator was K-selected and will take longer to produce a resistant variety. B. the predator was r-selected and was therefore more susceptible to the spray. C. they, too, are insects so they are r-selected. D. the scale insect was K-selected and the high number of young included a resistant strain, while the predator was r-selected and will take longer to produce a resistant variety.
Which of the following statements about T lymphocytes is FALSE?
A. T lymphocytes produce antibody molecules. B. T lymphocytes directly attack cells and produce the cell-mediated immune response. C. T lymphocytes mature in the thymus. D. T lymphocytes have TCRs that recognize unique antigens. E. T lymphocytes require antigen presentation to become activated.