Which best describes the lower body structures of humans and chimpanzees? the big toes of humans and chimpanzees are enlarged, the human foot has two arches but the chimpanzee foot only has one, human knees are very mobile but chimpanzee knees are stabilized by a tendon or the blades of the human pelvis are not rotated inward like those of a chimpanzee.

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.

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