19) The single letter code of the 57th amino acid in stated during class) chymot

Question

19) The single letter code of the 57th amino acid in stated during class) chymotrypsin can be related to (as A) Interstate 195 D) more states than the USA has B) Heinz ketchup (H) C) My thesis lab 102 E) it is serine 20) Which of the following docs NOT apply to the reaction catalyzed by the pyruvate dehydrogenase complex? A) The process is highly exergonic and essentially irreversible in vivo. B) Each intermediate in the five step reaction is able to diffuse to the next active site in a sequential manner. C) It takes place in the mitochondrion. D) It is an oxidative decarboxylation. E) The product is acetyl CoenzymeA. 21) Which of the following amino acids forms a tetrahedral oxyanion with the protein substrate in the chymotrypsin mechanism? A) H 57 B) S 195 C) D 102 D) V 600 E) E 600 22) The Michaelis-Menten constant, Kw, is represented by which of the ratio of which of the following rate constants? A) (ki + k) /k; B) (ki+k2)/k. C) (ki + k2)/k. E) Both A and D are corect 23) Which of the following amino acids is capable of forming a N-linked glycoprotein (protein with a sugar linked to it). A) S B) N C) Q D) V E) None of the above

Explanation / Answer

Ans 19 : B) Heinz ketchup (H)

The 57th amino acid in the chymotrypsin molecule is Histidien , which has the single letter code as "H" and three letter code as "His".

The molecule has a polypeptide chain of 245 amino acids and histide is present as the 57th amino acid and as part of its active site.

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