Which of the following is a characteristic of a cell’s plasma membrane?

a. Having hydrophilic surfaces
b. Being a static structure
c. Having three layers of phospholipids
d. Having hydrophilic fatty acid tails


a. Having hydrophilic surfaces

Having hydrophilic surfaces is a characteristic of a cell’s plasma membrane.

Biology & Microbiology

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A change in a population that is NOT related

strictly to the size of the population is best described as

a. density-dependent. b. density-independent. c. biotic. d. logistic. e. exponential

Biology & Microbiology

The chromosomal designation for a human male is

A. XX. B. XO. C. XY. D. YY. E. XXX.

Biology & Microbiology

Looking at the information in the table above, if the A allele results in normal pigmentation and the a allele in albinism, what fraction of offspring would you expect to show albinism?

a) 1/4 b) 1/2 c) all of them d) 3/4 e) 2/4

Biology & Microbiology

Which of the following situations does not result in a breakdown of the proton gradient?

a. Cyanide poisoning b. Oxygen deprivation c. Uncoupling proteins

Biology & Microbiology