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Which of the following enzymes functions at the lowest pH?

A.

Trypsin

B.

Pancreatic amylase

C.

Pepsin

D.

Salivary amylase

Answer and Explanation

The Correct Answer is C

A. Trypsin functions in the small intestine, where the environment is slightly alkaline. Therefore, this enzyme does not function at a low pH.

B. Pancreatic amylase also functions in the small intestine, where the pH is neutral to slightly alkaline.

C. Pepsin functions in the stomach, where the environment is highly acidic (pH 1.5 to 2). Pepsin is the correct answer because it works optimally at this low pH.

D. Salivary amylase functions in the mouth, where the pH is neutral or slightly alkaline.


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Related Questions

Correct Answer is D

Explanation

A. Amino acids; proteins: Amino acids are the end products of protein digestion, not the substrates that are broken down.

B. Polysaccharides; amino acids: Polysaccharides are broken down into simple sugars (monosaccharides), not amino acids.

C. Proteins; nucleotides: Proteins are broken down into amino acids, not nucleotides. Nucleotides are components of nucleic acids, not proteins.

D. Nucleic acids; nucleotides: Nucleic acids (such as DNA and RNA) are broken down into nucleotides.

Correct Answer is C

Explanation

A. Cutaneous transpiration: While cutaneous transpiration (evaporation of sweat from the skin) contributes to water loss, it is not the primary mechanism controlling water output.

B. Drinking: Drinking affects water intake rather than output. It does not directly control how much water is excreted from the body.

C. Urine volume: Urine volume is the primary means by which the body regulates water output. The kidneys adjust urine volume to maintain fluid balance and homeostasis.

D. Sweating: Sweating contributes to water loss but is not the primary mechanism for controlling overall water output compared to urine production.

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