Multiple Choice
Which of the following correctly lists functions of proteins in biological systems?
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1. Introduction to Biochemistry
Proteins
Multiple Choice
In humans, protein digestion begins in which organ due to the action of pepsin in an acidic environment?
A
Large intestine (colon)
B
Small intestine (duodenum)
C
Mouth
D
Stomach
Verified step by step guidance1
Identify the organ where protein digestion begins in humans by considering the environment required for the enzyme pepsin to function effectively.
Recall that pepsin is an enzyme that breaks down proteins and requires an acidic environment to be active.
Recognize that the stomach provides an acidic environment due to the secretion of gastric acid (hydrochloric acid), which lowers the pH.
Understand that the mouth and large intestine do not provide the acidic conditions necessary for pepsin activity, and the small intestine primarily functions in later stages of digestion with different enzymes.
Conclude that protein digestion begins in the stomach because it is the first organ where pepsin acts in an acidic environment.
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