Which macromolecule serves as the main source of energy?  

What determines the movement of ions across a membrane?

What property of water supports the transport of nutrients in plants?

A cell needs to take in large quantities of cholesterol molecules, which are too big to pass through the plasma membrane by simple diffusion. What is the most efficient way for the cell to transport cholesterol?

How do chloroplasts contribute to a plant’s survival?

Which of the following best describes the fluid mosaic model of the plasma membrane?

How many ATP molecules are produced from one molecule of glucose in aerobic respiration?

ATP releases energy when:

Which molecule is directly used for energy in most cellular processes?

What makes RNA different from DNA?