Phycobilins are
(a) photosynthetic pigments.
(b) found in the red algae.
(c) blue and red pigments.
(d) all of the above.
(d) all of the above.
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Cell signaling between two nerve cells is an example of paracrine signaling because:
A. a signaling molecule (neurotransmitter) is released. B. a receptor is activated. C. the cells are in close proximity. D. the responding cell releases more signaling molecule (neurotransmitter).
Microorganisms in the human colon are more often being described as mutualistic with human hosts rather than commensalistic. Why has this change in the definition of a symbiotic relationship occurred?
A. As we learn more about the ecology of the human microbiome, we have learned that these organisms are dependent on the nutrients that we provide for their survival. B. As we learn more about the ecology of the human microbiome, we recognize our dependence on these organisms for immunity, vitamin production, and other essential processes. C. As we learn more about the makeup of the human digestive tract, we realize that some microorganisms are potentially pathogenic while others are not. D. All of the choices are correct.
Cation exchange between soil particles and root hairs is the process in which:a
protons are exchanged for positively charged mineral ions. b. electrons are exchanged for positively charged mineral ions. c. protons are exchanged for negatively charged mineral ions. d. electrons are exchanged for negatively charged mineral ions. e. water is exchanged for positively charged mineral ions.
Which of the following statements is true?
A) Even in a seemingly clear-cut example of complete dominance, at the protein or enzyme level, one can detect about half the activity or gene product. B) In the threshold effect, one would expect the gain of function mutant to be recessive. C) With both incomplete dominance and codominance, one expects heterozygous and homozygous classes to be phenotypically identical. D) The threshold effect is only seen in incomplete dominance, not in codominance. E) An individual won't show incomplete dominance if one allele is a loss of function allele.