Which of the following statements regarding fins on fishes is true?
a. fins evolved so that fish could swim better.
b. fins resulted from a mutation caused by a movement from land to water.
c. fins are an adaptation that aid in swimming.
d. fins came about because animals couldn't live in water without them.

Which substance contains thylakoids? a) nadph b)atp c)stroma d)chloroplast

The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.

Discuss cell surface transport in the structure of constituents