What structure in the membrane causes plasma membranes to resist freezing?
A) Channel proteins
B) Nonpolar heads of the phospholipids
C) Unsaturated fatty acid tails
D) Cholesterol
E) Saturated fatty acid tails
C
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This unit explored features that describe living organisms. Choose all that apply to living organisms from the following.
Killer lymphocytes can elicit self-destruct mechanisms in target cells by interacting with
A) Fas ligand. B) Fas receptors. C) Ras ligand. D) adaptor proteins. E) procaspase.
After Darwin concluded his voyage on the Beagle, he proposed that the process of natural selection was a mechanism for
A. evolution. B. overpopulation of finches on the Galapagos Islands. C. artificial selection. D. speciation. E. sexual selection.
What is the term used for groups of microbes that have similar metabolic requirements and therefore live in similar environmental niches?
A. Ecosystem B. Guild C. Microbiome D. Population