Stimulation of T lymphocytes, leading to their synthesis of a growth factor resulting in T lymphocyte proliferation, is an example of _______ signaling.
a. autocrine
b. endocrine
c. paracrine
d. direct cell-to-cell
Answer: a. autocrine
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In photosynthesis, what is a photoact?
a. A photoact is a process where photons are harvested by antenna proteins for use in the reaction center. b. A photoact is a process by which water is split to harvest replacement electrons. c. A photoact is a process where two chlorophylls in the reaction center give up electrons, converting light energy to excited electrons. d. A photoact is a process that delivers photons to the reaction center.
The highest number of individuals in the United States are in the ____ age structure category
a. pre-reproductive b. early reproductive c. late reproductive d. early post-reproductive e. late post-reproductive
If cell division is no longer possible, eukaryotes can arrest the cell cycle. During which stage is this decision made?
A. telophase B. G1 C. G2 D. S phase E. prophase
?
A. stamen B. carpel C. filament D. Site of pollen production E. Sticky landing pad for pollen grains F. Pollen tube extends inside this structure G. ovary H. Main function is to attract pollinators I. sepal J. receptacle K. Structure that develops into a seed