What is the most common way that active transport
occurs in the cell?
A. Particles flow into the cell through
holes in the cell membrane.
B. Pumps embedded in the cell membrane
use energy to bring particles into the cell.
C. Particles simply follow the
concentration gradient.
D. Organelles leave the cell, gather
particles, and bring them back into the
cell.
PLEASE HELP ME THANK YOU SO MUCH

What does gradualism and punctuated equilibrium have in common

You have just sequenced a new protein found in mice and observe that sulfur-containing cysteine residues occur at regular intervals. what is the significance of this finding? it will be important to include cysteine in the diet of the mice. cysteine residues are required for the formation of α helices and β pleated sheets. cysteine residues are involved in disulfide bridges that form tertiary structure. cysteine causes bends, or angles, to occur in the tertiary structure of proteins.

The pelican's beak is adapted for in .