Membrane Structure and Functions – Section 1

6. In Fluid mosaic model, the biological membrane can be viewed as

A. two dimensional solutions of oriented lipids and globular proteins
B. three dimensional solutions of oriented lipids and globular proteins
C. two dimensional solutions of oriented lipids and carbohydrate
D. three dimensional solutions of oriented lipids and carbohydrate

Correct Answer: A. two dimensional solutions of oriented lipids and globular proteins

7. Membrane lipids are

A. hydrophilic
B. hydrophobic
C. amphiphilic
D. none of these

Correct Answer: A. hydrophilic

8. Pinocytosis occurs in

A. all eukaryotic cells
B. all prokaryotic cells
C. mitochondria of all cells
D. none of these

Correct Answer: A. all eukaryotic cells

9. Exocytosis is the secretion of proteins

A. out of the cell across the plasma membrane into the extracellular space
B. out of the cell across the plasma membrane into the intracellular space
C. is the uptake of macromolecules from the extracellular space into the cell across the plasma membrane
D. is the uptake of macromolecules from the intracellular space into the cell across the plasma membrane

Correct Answer: A. out of the cell across the plasma membrane into the extracellular space

10. The membrane proteins that catalyze active transport reactions differ from soluble enzymes as

A. they are permanently changed during the reaction
B. the substrates of the reaction are all outside the cell
C. they do not enhance the rates of reaction
D. the products of the reaction move in a specific direction

Correct Answer: D. the products of the reaction move in a specific direction

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