10 Questions
Acetoacetate is a ketone body that loses CO2 to form acetone.
False
Triacylalycerols are digested in the small intestine.
True
Ketone bodies are formed in the liver during lipolysis.
True
Lipids are a poor source of energy.
False
Ketosis occurs when blood pH rises above 7.4.
False
Glycerol is a fatty acid.
False
Triglycerides are stored in adipose cells as a source of energy.
True
Pancreatic lipases are involved in the digestion of proteins.
False
Acidosis occurs when blood pH rises above 7.4.
False
Lipids are formed from the combination of fatty acids with glycerol.
True
Study Notes
Lipid Metabolism
- Lipids are esters of fatty acids with glycerol, also called triglycerides or triacylglycerols.
- They are a good source of energy, providing 9 calories per gram.
- Triglycerides are the main stored form of energy in adipose cells.
Digestion of Triacylglycerols
- Triacylglycerols are digested in the small intestine.
- Pancreatic lipases break down triacylglycerols into fatty acids and glycerol.
Ketone Bodies
- Acetoacetyl CoA hydrolyzes to acetoacetate, a ketone body.
- Acetoacetate can be converted to p-hydroxybutyrate, another ketone body.
- Acetoacetate can also lose CO2 to form acetone, a third ketone body.
- Ketone bodies are produced when there is a lack of glucose, leading to the breakdown of fatty acids.
- High levels of ketone bodies in the blood can lead to acidosis, characterized by a pH below 7.4.
Ketosis
- Ketosis is a state in which ketone bodies accumulate in the blood.
- Ketosis can occur in diabetes, diets high in fat, and starvation.
This quiz covers the digestion of triacylglycerols, the formation of ketone bodies, and their effects on the body. It includes the different types of ketone bodies and their formation.
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