Which of the following is a function of the sterols that are found in animal cell membranes?
a. They maintain membrane fluidity.
b. They facilitate ion transport.
c. They store cellular energy.
d. They increase the rate of diffusion.
Answer: a. They maintain membrane fluidity.
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Select the two major functions of the estrogen and progesterone secreted by the human placenta.
A nursing baby:a
lacks cell mediated immunity. b. lacks antibody mediated immunity. c. lacks an adaptive immune response. d. receives active immunity via the breast milk. e. receives passive immunity via the breast milk.
Cell communication is critical for the function of both unicellular and multicellular eukaryotes. Which of the following is likely true of cell signaling?
(A) Cell signaling uses the highest molecular weight molecules found in living cells. (B) Cell signaling has largely been replaced by other cell functions in higher mammals. (C) Similar cell signaling pathways in diverse eukaryotes are evidence of conserved evolutionary processes. (D) Cell signaling functions mainly during early developmental stages.