Photosynthesis and respiration processes show plant cells to be very simple in design.
a. true
b. false

segmentation=endoskeleton=backbone=coelom=tissues

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.