Bacteria reproduce by binary fission, in which each cell divides into two daughter cells that are similar in size and shape. which type of reproduction occurs in this case?
a) sexual
b) asexual
c) fertilization
d) reduction division

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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