Spectrin and ankyrin are the peripheral proteins present in the membrane of RBC. Peripheral proteins are extrinsic proteins bound to membranes by electrostatic and hydrogen bond interactions.
Name the technique which is used to visualize the distribution of the protein in the membrane?
A.
Patch clamp technique
B.
FRAP
C.
Freeze-etching
D.
Freeze-fracture technique
Answer: Option D
Explanation:
Freeze-fracture technique is used to visualize the protein distribution in the membrane by quickly frozen the specimen at -196°C and then split with a cold knife to expose the interior of the lipid bilayer and its embedded proteins.
Which of the following transport protein allows the transport of single solute from one side of the membrane to other?
A.
Active transport
B.
Passive transport
C.
Uniporters
D.
Co-transporter
Answer: Option C
Explanation:
Uniporters are uniport which mediates single noncoupled transport of single solute from one side of the membrane to other. Examples: glucose transporter (GLUT).
Transfer of the second solute in the same direction
B.
Transfer of the second solute in the opposite direction
C.
Transfer of single solute
D.
Transfer of solute through pores
Answer: Option B
Explanation:
Antiporters are the co-transporter protein i.e. coupled transport of two solutes in opposite direction. Example: transport of calcium ion out of cardiac muscle cells.
