Hings like your eye color and height are not traits you can control. in fact, you inherit traits like these from your parents. these traits are passed on because they are controlled by a) lna b) genes c) hormones d) tradition

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.

a symbiotic relationship with the mitochondria