1. The following enzyme type is MOST LIKELY to have a large negative ?G°\': A De
ID: 3166797 • Letter: 1
Question
1. The following enzyme type is MOST LIKELY to have a large negative ?G°':
A
Dehydrogenase
B.
Isomerase
C.
Mutase
D.
Phosphatase
E.
Compared to Isomerases and Mutases, only Dehydrogenases and Phosphatases would likely have a large negative ?G°'.
2. The equilibrium for the formation of glyceraldehyde-3-phosphate from dihydroxyacetone phosphate is driven by:
A.
The fact that the mass action ratio, Q, is a value greater than one within the cell.
B.
The reactant in the reaction is in high concentration relative to the product(s).
C.
ATP is used to drive the reaction.
D.
The equilibrium constant favors the reaction.
E.
None of these drive this reaction.
3. How many ATPs per glucose are made via substrate phosphorylation reactions during glycolysis?
A.
1
B.
2
C.
4
D.
6
E.
8
4. Approximately this many TOTAL reactions occur during conversion of glucose to pyruvate:
A.
5
B.
10
C.
15
D.
20
E.
25
5. The first reaction in glycolysis that results in the formation of a high energy compound (i.e., a compound whose hydrolysis has a highly negative ?G'°) is catalyzed by:
A. glyceraldehyde 3-phosphate dehydrogenase.
B. hexokinase.
C. phosphofructokinase.
D. phosphoglycerate kinase.
E. triose phosphate isomerase.
A
Dehydrogenase
B.
Isomerase
C.
Mutase
D.
Phosphatase
E.
Compared to Isomerases and Mutases, only Dehydrogenases and Phosphatases would likely have a large negative ?G°'.
Explanation / Answer
1- D option Isomerase and mutase have positive delta g values while rest of two have negative g values.
2- B option Since G3P is rapidly removed from glycolysis , therefore DHAP rapidly converts to G3P.
3- B option , step involved is phosphoenol pyruvate kinase mediated.
4- B option
5- B hexokinase , phosphofructokinase and phosphoenol pyruvate kinase have negative g values . But since 1st step would be hexokinase
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