Multiple Choice
In human physiology, the blood protein fibrinogen is necessary for which process?
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1. Introduction to Biochemistry
Proteins
Multiple Choice
In gastric protein digestion, the primary role of hydrochloric acid (HCl) is to:
A
Hydrolyze peptide bonds directly by acting as a protease
B
Denature dietary proteins and activate pepsin by converting pepsinogen to pepsin
C
Neutralize stomach contents to provide the optimal pH for pancreatic trypsin
D
Emulsify dietary fats to increase the surface area for lipase activity
Verified step by step guidance1
Understand the role of hydrochloric acid (HCl) in the stomach during protein digestion. HCl creates an acidic environment in the stomach.
Recognize that HCl does not directly hydrolyze peptide bonds like a protease enzyme would; instead, it facilitates protein digestion indirectly.
Know that HCl denatures dietary proteins, which means it unfolds the protein structures, making them more accessible to enzymatic action.
Learn that HCl activates pepsin by converting its inactive precursor, pepsinogen, into the active enzyme pepsin, which then hydrolyzes peptide bonds.
Distinguish this role from other options: HCl does not neutralize stomach contents (it acidifies them), nor does it emulsify fats (this is the role of bile).
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