Membrane Structure and Functions problems
- 1. Exocytosis is the secretion of proteins
Options- 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 Discuss
Correct Answer: out of the cell across the plasma membrane into the extracellular space
- 2. Biological membranes are like water beds because
Options- A. they are always moving
- B. they (normally) do not leak their contents
- C. the membrane is thin compared to the enclosed volume
- D. all of the above Discuss
Correct Answer: all of the above
- 3. In active transport, the membrane structure that functions is
Options- A. cholesterol
- B. integral proteins
- C. carbohydrates
- D. hydrophobic molecules Discuss
Correct Answer: integral proteins
- 4. Cholesterol is somewhat amphipathic due to
Options- A. the single hydroxyl along with the hydrocarbon nature of the remainder of the molecule
- B. the long branched hydrocarbon along with the four hydrocarbon rings
- C. the five-methyl groups along with the hydrocarbon chain
- D. the three six-membered rings along with the single five-membered ring Discuss
Correct Answer: the single hydroxyl along with the hydrocarbon nature of the remainder of the molecule
- 5. Pinocytosis occurs in
Options- A. all eukaryotic cells
- B. all prokaryotic cells
- C. mitochondria of all cells
- D. none of these Discuss
Correct Answer: all eukaryotic cells
- 6. Which of the following is not found in membranes?
Options- A. Glycoproteins
- B. Glycolipids
- C. Nucleic acids
- D. Phospholipids Discuss
Correct Answer: Nucleic acids
- 7. Which of the following is correct?
Options- A. Peroxisomes have a single boundary membrane
- B. Peroxisomes contain enzymes that degrade fatty acids and amino acids
- C. The byproduct of given reactions in (b) is toxic to cells
- D. All of the above Discuss
Correct Answer: All of the above
- 8. The plasma membrane is a selectively permeable barrier due to presence of specific transport
Options- A. proteins
- B. amino acids
- C. carbohydrates
- D. none of these Discuss
Correct Answer: proteins
- 9. Membrane lipids are
Options- A. hydrophilic
- B. hydrophobic
- C. ampiphillic
- D. none of these Discuss
Correct Answer: hydrophilic
- 10. In Fluid mosaic model, the biological membrane can be viewed as
Options- 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 Discuss
Correct Answer: two dimensional solutions of oriented lipids and globular proteins
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