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An animal requires 20 amino acids to make proteins. Why aren鈥檛 all 20 essentials to animal diets?

If a zoo animal eating ample food shows signs of malnutrition, how might a researcher determine which nutrient is lacking in its diet?

Fat digestion yields fatty acids and glycerol. Protein digestion yields amino acids. Both digestive processes

(A) occur inside cells in most animals.

(B) add a water molecule to break bonds.

(C) require a low pH resulting from HCl production.

(D) consume ATP.

Distinguish the overall structure of a gastrovascular cavity from that of an alimentary canal.

In what sense are nutrients from a recently ingested meal not really 鈥渋nside鈥� your body prior to the absorption stage of food processing.

Which of the following organs is incorrectly paired with its function?

(A) stomach鈥攑rotein digestion

(B) large intestine鈥攂ile production

(C) small intestine鈥攏utrient absorption

(D) pancreas鈥攅nzyme production

What are two advantages of a longer alimentary canal for processing plant material that is difficult to digest?

What features of a mammal鈥檚 digestive system make it an attractive habitat for mutualistic microorganisms?

鈥淟actose-intolerant鈥� people have a shortage of lactase, the enzyme that breaks down lactose in milk. As a result, they sometimes develop cramps, bloating, or diarrhea after consuming dairy products. Suppose such a person ate yogurt that contains bacteria that produce lactase. Why would eating yogurt likely provide at best only temporary relief of the symptoms?

Which of the following is not a major activity of the stomach?

(A) storage

(B) HCl production

(C) nutrient absorption

(D) enzyme secretion