The part of a membrane protein that extends through the phospholipid bilayer is primarily composed of amino acids that are
A. water soluble.
B. highly polar.
C. non-polar.
D. positively charged.
E. negatively charged.
Answer: C
Biology & Microbiology
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a. 3.8 billion years ago. b. 2.1 billion years ago. c. 1.5 billion years ago. d. 750 million years ago. e. 201 million years ago
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A genetically directed deviation from the average is called
a. an abnormality. b. a disorder. c. a syndrome. d. a carrier. e. a pedigree.
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Which of the following has a nucleoid region?
a. Animal cell
b. Prokaryotic cell
c. Virus
d. Eukaryotic cell
e. Plant cell
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A biologist is studying how pollution affects algal growth and snail populations in a portion of Lake Erie. What level of organization is she studying?
a. population b. community c. ecosystem d. cells
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