Which of these choices is a disadvantage of the endangered species act ? a. can be difficult to increase wild populations b. increases environmental awareness c. restore balance to ecosystem d. can save species from extinction

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?