31 To what main class of enzymes does the enzyme that catalyzes this reaction be

Question

31 To what main class of enzymes does the enzyme that catalyzes this reaction belon A) lyase B) oxidoreductase C) hydrolase D) isomerase E) ligase Use the following to answer questions 32-34: Refer to the following graph to answer the question(s) below Optimum pH Pepsinamylase Salivary 12 3 45 6 7891011 12 pH Basic Acidic At which of the following pHs is the reaction that pepsin catalyzes the fastest? A) 1.0 B) 2.0 C) 5.0 D) 7.0 E) 11 32 33 Where is pepsin most likely to be found? A) stomach (pH 2) B) liver (pH 5) C) pancreas (pH 7) D) blood (pH 7.4) E) small intestine (pH 8) 34 Why is pepsin most likely to be found where it is found in the body? A) Enzymes typically are fastest at pH 7.4. B) A neutral pH will speed up an enzyme. C) Enzymes are typically found where they can work under optimal conditions. D) Pepsin is involved in catabolism, which occurs under basic conditions. E) Pepsin is involved in detoxification.

Explanation / Answer

32) From the graph it is clearly seen pepsin catalyzes fastest at pH 2.0 (Peak for pepsin is highest at this) answer B

33) Stomach (pH 2,Pepsin will be found) answer A

34)Enzymes are naturally found where they are in optimum condition(C)

35) A substance that reacts under the influence of enzyme is usually held with enzyme by side chains of an amino acid as side chains of amino acids are bonded to the substrate in the active site.(B)

37)The lock-and-key model states that the substrate acts as a 'key' to the 'lock' of the active site and the substrate induces a change of shape in the enzyme.(B)

40)A nucleoside consists simply of a nucleobase (also termed a nitrogenous base) and a five-carbon sugar (either ribose or deoxyribose) (A)

41)Bond between sugar and bases are N-Glycosidic bond (D)

54)Anticodons are found on molecules of tRNA and codon on a strand of mRNA .(a)

55)t-RNA Binds to m-RNA (B)

56) Again already stated,Anticodons are found on molecules of tRNA and codon on a strand of mRNA (D)

57) They are connected by hydrogen bonds(B)

58)Amino acid attached to t-RNA by ester bonds(E)

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