31. In Figure 30-4, which structure represents unsaturated fat? Which structure represents saturated fat? At room temperature, what state is each type of fat? State whether each type of
fat is associated with heart problems. Give an example of each type of fat.

coal is not sustainable because it will one day run out.

there really is life in the deepest part

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.