The "fluid mosaic" model of the plasma membrane describes the plasma membrane as a solid, inflexible structure with a certain distribution of proteins that does not vary from cell to cell
a. true
b. false
Answer: b. false
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For reciprocal altruism to work, individuals must be able to:
A. recognize one another. B. remember previous interactions. C. calculate the fitness value of individual interactions. D. recognize one another and remember previous interactions. E. recognize one another, remember previous interactions, and calculate the fitness value of individual interactions.
If two genes from one RNA molecule become detached and then, as a unit, get attached to one end of the other RNA molecule within a single HIV particle, which of these is true?
A) There are now fewer genes within the viral particle. B) There are now more genes within the viral particle. C) A point substitution mutation has occurred in the retroviral genome. D) The retroviral equivalent of crossing-over has occurred, no doubt resulting in a heightened positive effect. E) One of the RNA molecules has experienced gene duplication as the result of translocation.
Which one of the following is true with regard to the numbers of subatomic particles in an atom?
A. The number of neutrons always equals the number of protons. B. The number of electrons always equals the number of neutrons. C. The atomic number always equals the number of protons. D. The atomic number always equals the number of neutrons.
When sucking liquid into the tip of a micropipette, why do you release the push button slowly?
What would be an ideal response?