The movement of auxin downward from its site of production is referred to as:
a. gravitropism.
b. apical dominance.
c. nonpolar transport.
d. polar transport.
e. turgor movement.
d
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Which of the following enzymes is responsible for specifically transcribing tRNA in eukaryotic cells?
A) RNA polymerase I B) RNA polymerase II C) RNA polymerase III D) primase E) RNase H
Which of the following represents an early
stage in primary succession? a. pine trees b. moss and lichens on bare rock c. weedy annual plants in an open field d. climax species in succession e. alder, cottonwood, and willow thickets
When Hairston, Smith, and Slobodkin suggested that the earth is green because carnivores depress the populations of herbivores that would otherwise consume most vegetation, they were focusing on __________ control of community structure.
A) top-down B) bottom-up
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 are called such because they mature in the thymus. D) T lymphocytes have TCRs that recognize antigen only if it is bound to MHC. E) There are three types of T lymphocytes.