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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 C

Explanation

A. Lactose is a sugar in breast milk and is not the only source of nutrition during the first 2-3 days postpartum.

B. Casein is a protein found in breast milk but not the sole source of nutrition for the infant.

C. Colostrum is the nutrient-rich first milk produced by the mother in the first 2-3 days postpartum and provides essential nutrients and antibodies to the newborn.

D. Meconium is the infant's first stool and not a source of nutrition.

Correct Answer is C

Explanation

A. Tubuloglomerular feedback involves the macula densa sensing changes in sodium chloride concentration and adjusting the glomerular filtration rate (GFR) via the juxtaglomerular apparatus.

B. Renal autoregulation includes mechanisms like the myogenic mechanism and tubuloglomerular feedback that maintain stable GFR despite blood pressure changes. This option is too broad and not specific to the mechanism described.

C. The myogenic mechanism refers to the smooth muscle's tendency to contract when stretched, helping to stabilize GFR by adjusting the diameter of the afferent arterioles. This is the correct answer.

D. Sympathetic control influences renal blood flow and GFR through hormonal and nervous system regulation, but it is not the specific mechanism described in the question.

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