Acell entering the cell cycle with 32 chromosomes will produce two daughter cells, each with

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).