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Regulation of Glycolysis: Irreversible Enzymes

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Regulation of Glycolysis: Irreversible Enzymes

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Questions and Answers

What is the most important control point of glycolysis?

Phosphorylation of glucose 6-phosphate

Isomerization of glucose 6-phosphate

Phosphorylation of fructose 6-phosphate (correct)

Dehydrogenation of glyceraldehyde 3-phosphate

Which enzyme catalyzes the isomerization of glucose 6-phosphate to fructose 6-phosphate?

Hexokinase

Phosphoglucose isomerase (correct)

Phosphofructokinase-1

Isomerase kinase

Which type of sugar is fructose 6-phosphate?

Aldose sugar

Sucrose sugar

Glucose sugar

Ketose sugar (correct)

In glycolysis, what process converts glucose 6-phosphate into fructose 6-phosphate?

Isomerization Signup and view all the answers

What type of reaction is the phosphorylation of fructose 6-phosphate catalyzed by PFK-1?

Irreversible reaction Signup and view all the answers

What is the rate-limiting step in glycolysis?

PFK-1 reaction Signup and view all the answers

Which substrates control the PFK-1 enzyme in glycolysis?

ATP and fructose 6-phosphate Signup and view all the answers

What regulates the PFK-1 enzyme in glycolysis, besides ATP and fructose 6-phosphate?

Hormones Signup and view all the answers

Which of the following is NOT a type of regulation involved in glycolysis?

Genetic regulation Signup and view all the answers

In glycolysis, what controls the activity of the PFK-1 enzyme?

ATP and fructose 6-phosphate Signup and view all the answers

Which enzymes are primarily responsible for regulating the rate of glycolysis?

Hexokinase, Phosphofructokinase-1, Pyruvate Kinase Signup and view all the answers

What is the main role of ATP in the regulation of glycolysis?

Inhibits the key enzymes of glycolysis Signup and view all the answers

How do hormones impact glycolysis regulation?

Enhance the activity of rate-limiting enzymes Signup and view all the answers

What effect does increased substrate concentration have on glycolysis regulation?

Speeds up the glycolytic pathway Signup and view all the answers

Which of the following is NOT a mechanism for regulating glycolysis?

Regulation by transcription factors Signup and view all the answers