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11 Dec 2019

A. Which of the following enzymes in glycolysis catalyze a step that involves the production ATP?

Glyceraldehyde-3-phosphate dehydrogenase

Phosphofructokinase

Pyruvate kinase

Hexokinase

B. Which of the following enzymes catalyzes a reaction that involved a phosphorylation?

Triose phosphate isomerase

Phosphoglycerate mutase

aldolase

Glyceraldehyde-3-Phosphate Dehydrogenase

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13 Dec 2019

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Related questions

Which enzyme below used in gluconeogenesis is also used in glycolysis to catalyze the reverse reaction?

a)

pyruvate dehydrogenase to form acetyl CoA
b)

glucose 6-phosphatase to form glucose
c)

fructose 1,6-bisphosphatase to form fructose 6-phosphate
d)

phosphoglycerate kinase to form 1,3-bisphosphoglycerate
e)

phosphoenolpyruvate carboxykinase to form phosphoenolpyruvate

Enzymes that catalyze reactions in which a molecule is phosphorylated are usually called “kinases.” Hexokinase catalyzes the phosphorylation of glucose (a “hexose,” because it is a 6-carbon sugar). Phosphofructokinase 1 (PFK-1) catalyzes the phosphorylation of phosphofructose (another name for Fructose 6-phosphate). By contrast, enzymes that remove phosphates from molecules are called “phosphatases,” and reactions in which phosphates are removed are called dephosphorylation reactions. Even if you’ve never seen it before, what molecule do you predict is dephosphorylated by glucose 6-phosphatase?

Fructose 1,6-bisphosphate

Fructose 6-phosphate

Glucose 6-phosphate

Fructose

The following are approximate values for ΔG'0for several glycolytic enzymes:

ΔG'0 (J/mol)

Hexokinase

-19,000

Phosphohexose isomerase

+3,000

Phosphofructokinase

-16,000

Aldolase

+25,000

What is the value of ΔG'0 for the reaction:
Glucose + 2 ATP → Dihydroxyacetone-P + Glyceraldehyde-3-P + 2 ADP + 2 Pi

51 K'eq for the above reaction is:

A

greater than 1.

B

= 1.

C

less than 1 and greater than 0.

D

= 0.

E

less than 0.

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