There are at least four types of glucose transporter in the body. GLUT1 and GLUT3 are located in most tissues including the brain and the red blood cells. These glucose transporters rapidly take up glucose from the blood but have the lowest value. GLUT2 is commonly found in the liver and the pancreas. GLUT2 has a lower affinity for glucose but has the highest value. GLUT4 is common in skeletal tissues and in adipose tissues. This transporter is normally not active for uptake unless stimulated by insulin or during exercise.

During strenuous exercise, GLUT4 will be highly active. Which of the following intermediates will also increase?

I. Pyruvate

II.

III. ADP

What is the intermediate between citrate and isocitrate?

Pyruvate enters the citric acid cycle after being converted to a molecule with how many carbons?

Which molecule is not a citric acid cycle intermediate?

The citric acid cycle begins when the two-carbon acetyl group from acetyl-CoA combines with the four-carbon molecule __________ to form the six-carbon molecule citrate.

Which of the following Krebs cycle intermediate molecules can be used directly in another pathway to make fatty acids?

How many atoms of carbon are present in the citric acid cycle intermediate, fumarate?

How many molecules of carbon are present in the citric acid cycle intermediate, malate?

What vitamin does pyruvate dehydrogenase need in order to make pyruvate into acetyl-CoA for the citric acid cycle?