Biochemistry Multiple Choice Questions on “Structural Lipids in Membranes”.
1. Out of the following, cholesterol does not serve as a precursor for which compounds?
A. Vitamin D
B. Sex hormones
C. Bile salts
D. Bile pigments
Answer: D
Clarification: Cholesterol serves as a precursor for the biosynthesis of steroid molecules, bile acids and vitamin D.
2. Which of the following is a sphingophospholipid?
A. Lecithin
B. Sphingomyelin
C. Plasmolegen
D. Cardiolipin
Answer: B
Clarification: Lecithin, plasmolegen and cardiolipin are glycerophospholipids.
3. Which of the following glycerophospholid acts as a lipotropic agent?
A. Cardiolipin
B. Phosphatidylserine
C. Phosphatidylinositol
D. Phosphatidylcholine
Answer: D
Clarification: Only phosphatidylcholine acts as a lipotropic agent.
4. Which of the following phospholipids is a component of inner mitochondrial membrane?
A. Plasmologen
B. Cephalin
C. Lecithin
D. Cardiolipin
Answer: D
Clarification: Cardiolipin is an essential component of inner mitochondrial membrane.
5. In which of the following glycerophospholipids two phosphatidic acids share single glycerol?
A. Cardiolipin
B. Phosphatidylserine
C. Phosphatidylinositol
D. Phosphatidylcholine
Answer: A
Clarification: In cardiolipin, two phosphatidic acids share single glycerol.
6. Platelet activating factor stimulates the release of which of the following compounds?
A. Vasopressin
B. Serotonin
C. Adrenaline
D. Cortisol
Answer: B
Clarification: Platelet activating factor stimulates the release of serotonin.
7. Which of the following group of membrane lipids predominate in plant cells?
A. Galactolipids
B. Sphingolipids
C. Glycerophospholipids
D. Archaebacterial ether lipids
Answer: A
Clarification: Galactolipids are the lipids predominant in the chloroplasts of plants.
8. Which of the following membrane lipids have a direct glycosidic linkage between the head-group sugar and the backbone glycerol?
A. Glycolipids
B. Phospholipids
C. Sphingolipids
D. Ether lipids
Answer: A
Clarification: Glycolipids have a direct glycosidic linkage between the head-group sugar and the backbone glycerol.
9. The backbone of phospholipids is __________
A. L-glycerol 1-phosphate
B. L-glycerol 3-phosphate
C. D-glycerol 3-phosphate
D. sn-glycerol 1-phosphate
Answer: B
Clarification: L-glycerol 3-phosphate or D-glycerol 1-phosphate or sn-glycerol 3-phosphate is the backbone of phospholipids.
10. What is the head-group alcohol in plasmolegen and platelet-activating factor?
A. Alkene
B. Choline
C. Alkane
D. Acetic acid
Answer: B
Clarification: Choline is the head-group alcohol in plasmolegen and platelet-activating factor.
11. Which of the following does not contain glycerol?
A. Glycerophospholipids
B. Galactolipids
C. Sphingolipids
D. Triacylglycerols
Answer: C
Clarification: Sphingolipids contain sphingosine instead of glycerol.
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