Which statement is true of both active transport and facilitated diffusion
a: both require atp
b: both involve proteins in the cell membrane
c: both occur in only one direction
d: both move materials down a concentration gradient

Which best example best demonstrates the importance of having knowledge of evolutionary relationships? a. illustration of a plant b.organ transplantation between species c. blood donation from a human d. do you need sequence of an insect.

Match each medication with its description.

Lupe is a carrier for color blindness. her husband clifford is colorblind. if lupe and clifford have four children, what's the probability of a boy being colorblind?