Which of the following enzyme catalyzes the first step of glycolysis?

• Hexokinase

• Pyruvate kinase

• Phosphofructokinase-1
  

• Glucose 6 phospahatase

Whenever the cell’s ATP supply is depleted, which of the following enzyme’s activity is increased?

• Hexokinase

• Pyruvate kinase

• Glucokinase

• Phosphofructokinase-1

Answer explanation

Phosphofructokinase-1 is a regulatory enzyme; it is the major point of regulation in glycolysis. Its activity is increased whenever the cell’s ATP supply is depleted.

What is the general term used for the anaerobic degradation of glucose to obtain energy?

High concentration of glucose 6-phosphate is inhibitory to ___________

• Hexokinase

• Pyruvate kinase

• Phosphofructokinase-1

• Glyceraldehyde 3-phosphate

Glycolysis converts glucose into pyruvate

• True

• False

The brain can only use glucose as a fuel

• True
• False
• The brain can use both glucose and ketones as fuel
• The brain can use any type of fuel

Which one of the following is the first step of glycolysis?

• Breakdown of glucose

• Phosphorylation of glucose

• Conversion of glucose into fructose

• Dehydrogenation of glucose

The main transporter of glucose into RBCs is:

• GLUT1

• GLUT2

• GlUT3

• GLUT4

Which of the GLUTs is insulin dependent?

• GLUT1

• GLUT2

• GLUT3

• GLUT4

The pathway that is responsible for producing glucose from pyruvate is called: