Questions: 14. Which molecules can enter the Krebs cycle? a. chylomicrons b. acetyl COA c. monoglycerides d. ketone bodies

The answer is the second one (b): acetyl CoA.

Explanation for each option: a. Chylomicrons: These are lipoprotein particles that transport dietary lipids from the intestines to other locations in the body. They do not directly enter the Krebs cycle. b. Acetyl CoA: This is the correct answer. Acetyl CoA is a key molecule that enters the Krebs cycle (also known as the citric acid cycle or TCA cycle) to be oxidized for energy production. c. Monoglycerides: These are a type of glyceride and are not directly involved in the Krebs cycle. They are typically broken down into fatty acids and glycerol, which can then be further processed. d. Ketone bodies: These are produced during the breakdown of fatty acids and can be used as an energy source, especially during fasting or low carbohydrate intake. However, they do not directly enter the Krebs cycle; instead, they are converted into acetyl CoA first.

Summary: The molecule that can enter the Krebs cycle is acetyl CoA.