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Lipid Chemistry and Physiology Quiz

#1

Which of the following is not a function of lipids in the body?

Muscle contraction
Explanation

Lipids do not directly participate in muscle contraction.

#2

Which lipid is a major component of cell membranes?

Phospholipids
Explanation

Phospholipids form the basic structure of cell membranes.

#3

What is the main function of lipids in the body?

Provide energy
Explanation

Lipids serve as a concentrated energy source, providing more than twice the energy as carbohydrates or proteins.

#4

Which of the following is a function of phospholipids?

Cell membrane structure
Explanation

Phospholipids contribute to the structure of cell membranes, forming a lipid bilayer.

#5

Which of the following is a function of cholesterol?

Hormone production
Explanation

Cholesterol serves as the precursor molecule for the synthesis of steroid hormones, such as testosterone and estrogen.

#6

Which lipoprotein is considered 'bad' cholesterol?

LDL
Explanation

LDL is considered 'bad' cholesterol because it carries cholesterol to tissues, contributing to plaque buildup in arteries.

#7

What is the primary function of bile acids in lipid digestion?

Emulsify lipids
Explanation

Bile acids break down large fat globules into smaller droplets, aiding in their digestion by lipases.

#8

Which lipid is a precursor for the synthesis of steroid hormones?

Cholesterol
Explanation

Cholesterol serves as the precursor molecule for the synthesis of steroid hormones.

#9

Which lipoprotein is involved in transporting dietary triglycerides?

Chylomicrons
Explanation

Chylomicrons transport dietary triglycerides from the intestines to adipose tissue and muscles for storage or energy usage.

#10

Which fatty acid is classified as an omega-3 fatty acid?

Eicosapentaenoic acid (EPA)
Explanation

Eicosapentaenoic acid (EPA) is an omega-3 fatty acid commonly found in fish oils.

#11

Which lipoprotein is known as 'good' cholesterol?

HDL
Explanation

HDL is known as 'good' cholesterol because it helps remove LDL cholesterol from the bloodstream.

#12

Which enzyme is responsible for the breakdown of triglycerides into fatty acids and glycerol?

Lipase
Explanation

Lipase catalyzes the hydrolysis of triglycerides into fatty acids and glycerol.

#13

Which enzyme is responsible for the synthesis of fatty acids?

Fatty acid synthase
Explanation

Fatty acid synthase is an enzyme complex responsible for the de novo synthesis of fatty acids.

#14

Which enzyme is responsible for the synthesis of cholesterol?

HMG-CoA reductase
Explanation

HMG-CoA reductase is the rate-limiting enzyme in cholesterol biosynthesis.

#15

Which enzyme is responsible for the breakdown of phospholipids into fatty acids and glycerol?

Phospholipase
Explanation

Phospholipase catalyzes the hydrolysis of phospholipids into fatty acids and glycerol.

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