61) Small intestine is the place for chymotrypsin to digest protein. Chymotrypsi

Question

61) Small intestine is the place for chymotrypsin to digest protein. Chymotrypsine is secreted as proenzyme

(chymotrypsinogen) form first and activated. What is the mechanism of this activation?

A) Autocatalysis removes part of peptide

B) Intestinal lipase add active site

C) Intestinal trypsin removes a part of peptide

D) Trypsin from diet add active site

.

62) Amino acids are released after digesting food and used for energy metabolism. How are these amino acids possible to contribute for glycolysis or TCA cycle?

A) These amino acids are converted to fatty acid first, and then degraded to produce acetyl CoA

B) These amino acids are directly incorporated into glycolysis and TCA cycle.

C) These amino acids are converted to fructose first and converted to glucose to continue glycolysis and TCA cycle.

D) These amino acids are first go through oxidative deamination or transamination to remove nitrogen first.

.

63) Oxaloacetate is one of key molecules for connecting different pathways. Which processes are using oxaloacetate in their reactions?

A) Glycolysis

B) Oxidative phosphorylation

C) Pentose phosphate pathway

D) TCA cycle

Explanation / Answer

61(C)
62(A)
63(D)

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