Which of the following is an example of passive transport across the cell membrane?
A. the stimulation of a muscle cell
B. the uptake of glucose by the microvilli of cells lining the stomach
C. the movement of insulin across the cell membrane
D. the movement of carbon dioxide across the cell membrane
E. the selective uptake of hormones across the cell membrane

Restriction enzymes are used in making recombinant dna. describe the role restriction enzymes perform when constructing recombinant dna.

Is genetic diversity the same as genetic variation?

Cells a and b are the same size and shape, but cell a is metabolically quiet and cell b is actively consuming oxygen. oxygen will diffuse more quickly into cell because . b the oxygen molecules inside cell b have a higher kinetic energy b. a its membrane transport proteins will not be saturated c. a the diffusion gradient there is shallowerd. b the diffusion gradient there is steeper