#1
Which of the following is not a function of lipids in the body?
Muscle contraction
ExplanationLipids do not directly participate in muscle contraction.
#2
Which lipid is a major component of cell membranes?
Phospholipids
ExplanationPhospholipids form the basic structure of cell membranes.
#3
What is the main function of lipids in the body?
Provide energy
ExplanationLipids 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
ExplanationPhospholipids contribute to the structure of cell membranes, forming a lipid bilayer.
#5
Which of the following is a function of cholesterol?
Hormone production
ExplanationCholesterol serves as the precursor molecule for the synthesis of steroid hormones, such as testosterone and estrogen.
#6
Which lipoprotein is considered 'bad' cholesterol?
LDL
ExplanationLDL 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
ExplanationBile 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
ExplanationCholesterol serves as the precursor molecule for the synthesis of steroid hormones.
#9
Which lipoprotein is involved in transporting dietary triglycerides?
Chylomicrons
ExplanationChylomicrons 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)
ExplanationEicosapentaenoic acid (EPA) is an omega-3 fatty acid commonly found in fish oils.
#11
Which lipoprotein is known as 'good' cholesterol?
HDL
ExplanationHDL 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
ExplanationLipase catalyzes the hydrolysis of triglycerides into fatty acids and glycerol.
#13
Which enzyme is responsible for the synthesis of fatty acids?
Fatty acid synthase
ExplanationFatty 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
ExplanationHMG-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
ExplanationPhospholipase catalyzes the hydrolysis of phospholipids into fatty acids and glycerol.