A fisheries biologist tells you she is studying a cohort of salmon returning to their birth river. What does this tell you about these salmon?
A. These salmon are iteroparous.
B. Most of these salmon are one or two years old.
C. All of these salmon are the same age.
D. This group of salmon show a uniform distribution.
E. The salmon are still too young for reproduction.
C. All of these salmon are the same age.
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The two kinds of bone tissue are
(a) compact and loose. (b) compact and spongy. (c) dense and spongy. (d) loose and dense.
The embryo of the seed contains primarily
a. lipopolysaccharides. b. proteins and vitamins. c. cellulose. d. fructose. e. none of these.
Eukaryotic cells achieve compartmentalization through an extensive endomembrane system that weaves through the interior of the cell and by numerous membrane-bound that form compartments where biochemical processes can occur independently.
Pain receptors are activated by tissue damage, but pain perception requires intact, functional neurons. How does this work?
A. The nociceptor neuron only sends action potentials as it is dying. B. The neuron itself does not need to be damaged; it responds to signals released by nearby damaged cells. C. Nociceptor neurons have special membrane repair mechanisms. D. The axon continues to fire action potentials despite damage to the cell body.