Natural selection is a process by which:
a. the characteristics of individuals change over time.
b. the characteristics of populations change over time.
c. Both of the above.
d. None of the above.
B
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Which type of receptor is membrane-associated? (Select all correct choices.)
A. G protein-coupled receptor B. receptor kinase C. ligand-gated ion channel D. nuclear receptor
__________ are jawless fishes with a backbone. Fill in the blank(s) with the appropriate word(s)
Biologically speaking, a pigment:
a) is a molecule that absorbs a photon. b) is a cell that absorbs a photon. c) is a cell that absorbs carbon dioxide. d) is an electron that has been excited by a photon. e) is a molecule that releases oxygen.
All of the following are true about M protein except
A) It is heat- and acid-resistant. B) It is a protein. C) It is found on fimbriae. D) It is found on Streptococcus pyogenes. E) It is readily digested by phagocytes.