The Correct answer is option D) Pepsin would break down the protein molecules equally well in the laboratory as in the human stomach since it is a stable chemical.
Pepsin is an enzyme that breaks down protein molecules into smaller peptides. It is produced by the glands in the lining of the stomach and is active at low pH ranges. Enzymes are proteins themselves, and they are stable and able to function outside of the body under the right conditions.
In a test tube in a laboratory, pepsin would be able to break down protein molecules just as effectively as it does in the human stomach. This is because pepsin is a stable chemical and does not depend on the presence of other substances or conditions in order to function. The only requirement for pepsin to work is the presence of protein molecules and an acidic pH. As long as these conditions are met, pepsin should be able to break down the protein molecules in the test tube just as it does in the human stomach.
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Complete Question:
The human stomach is lined with glands that produce several chemicals that help in the process of digestion. One of these chemicals is hydrochloric acid, a powerful acid that makes the stomach very low in pH. Another substance is mucus--this substance lubricates and protects the stomach wall. A third substance is the enzyme pepsin which helps to break down protein molecules into smaller molecules called peptides.
If the chemical enzyme pepsin was mixed with some proteins in a test tube in a laboratory, which of these outcomes would you predict?
A) Pepsin would probably NOT break down proteins in the test tube because enzymes cannot exist outside of the human body.
B) Pepsin would partially break down the protein molecules but would not work well due to the absence of DNA in the test tube.
C) Pepsin would probably NOT break down proteins in the test tube because pepsin is designed to work at very acidic pH ranges.
D) Pepsin would break down the protein molecules equally well in the laboratory as in the human stomach since it is a stable chemical.
