Which molecule is used by cells as an energy source? many substances, such as cholesterol, bind to on the cell membrane, triggering endocytosis.

ATP is used as an energy source for cells

Many substances, such as cholesterol, bind to receptor sites on the cell membrane, triggering endocytosis.

"do a testcross with a homozygous recessive plant."

population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

here is your answer hope i .