Chemokines are a group of small proteins that
A) attract T cells to sites of injury.
B) function as chemoattractants for phagocytes and lymphocytes.
C) potentiate specific immune responses.
D) attract T cells, phagocytes, and lymphocytes, as well as potentiate specific immune responses.
Answer: D
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Chemical elements needed in trace amounts for biochemical reactions have a biogeochemical cycle, including boron, chromium, manganese, and cobalt.
Answer the following statement true (T) or false (F)
Which of the following nucleic acid elements
is thought that viruses might have evolved from?
a. mRNA b. introns c. transposons d. mitochondrial DNA e. exons
How do terrestrial animals prevent toxic accumulation of ammonia in their tissues?
a. They use ammonia in other metabolic processes. b. They convert ammonia to less toxic forms. c. They vent ammonia across the body wall. d. They eliminate ammonia rather than excreting it. e. Animals do not produce ammonia
Transduction involves all of the following, except
A) Changes in the transmembrane potential of the sensory receptor. B) An inhibition of certain specific regions in the cerebral cortex. C) The generation of an action potential that can be processed and interpreted by the CNS. D) The production of a generator potential. E) A stimulus altering the permeability of a receptor membrane.