Biochemistry Multiple Choice Questions on “Membrane Dynamics”.
1. Which of the following is not one of the states of lipids?
A. Para crystalline state
B. Liquid ordered state
C. Liquid disordered state
D. Crystalline state
Answer: D
Clarification: Para crystalline state, liquid ordered state and liquid disordered state are the states of lipids.
2. Which of the following arrangement based on the increasing order of motion is correct?
A. Uncatalysed transverse motion, transverse diffusion catalyzed by flippase, uncatalysed lateral diffusion
B. Uncatalysed lateral diffusion, uncatalysed transverse motion, transverse diffusion catalyzed by flippase
C. Uncatalysed transverse motion, uncatalysed lateral diffusion, transverse diffusion catalyzed by flippase
D. Transverse diffusion catalyzed by flippase, uncatalysed lateral diffusion, uncatalysed transverse motion
Answer: A
Clarification: Uncatalysed transverse motion (slow), transverse diffusion catalyzed by flippase (fast), uncatalysed lateral diffusion (very fast).
3. Movement of phospholipids from side to side is called ____________
A. Facilitated diffusion
B. Lateral diffusion
C. Transverse diffusion
D. Simple diffusion
Answer: B
Clarification: In lateral diffusion, movement of phospholipids from side to side.
4. Movement of phospholipids to opposite sides is called ____________
A. Facilitated diffusion
B. Lateral diffusion
C. Transverse diffusion
D. Simple diffusion
Answer: C
Clarification: In transverse diffusion, movement of phospholipids to opposite sides.
5. Trans bilayer diffusion is also called ____________
A. Facilitated diffusion
B. Lateral diffusion
C. Flip flop
D. Simple diffusion
Answer: C
Clarification: Trans bilayer diffusion is also called “Flip flop”.
6. Which of the following is an example of heterodimeric protein?
A. Integrin
B. Antibodies
C. Receptor tyrosine kinase
D. G-protein coupled receptor
Answer: A
Clarification: Antibodies, receptor tyrosine kinase and G-protein coupled receptor are homodimeric.
7. Which of the following is an example of peripheral membrane protein?
A. Insulin receptor
B. Glycophorin
C. Integrin
D. Glycolipid transfer proteins
Answer: D
Clarification: Insulin receptor, glycophorin and integrin are integral membranes.
8. Which of the following proteins does not function in cell-cell interaction?
A. Integrin
B. Cadherin
C. N-CAM
D. Cytochrome c
Answer: D
Clarification: Integral proteins Integrin, Cadherin, N-CAM and selectin function in cell-cell interaction.
9. Which of the following integral membrane protein is a special class of membrane rafts?
A. Caveolin
B. Integrin
C. Cadherin
D. Selectin
Answer: A
Clarification: Caveolin is a special class of membrane rafts.
10. Which of the following is one of the family of immunoglobin like proteins that mediate Ca+2?
A. N-CAM
B. Integrin
C. Cadherin
D. Selectin
Answer: A
Clarification: N-CAM is one of the family of immunoglobulin like proteins that mediate Ca+2.
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