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- Question
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
- Correct Answer
- all of the above
- 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
- 2. Bacteriorhodopsin
Options- A. absorbs light and pumps protons
- B. is an integral membrane protein
- C. contains primarily alpha-helical residues
- D. all of the above Discuss
- 3. Cholesterol is essential for normal membrane functions because it
Options- A. plugs up the cardiac arteries of older men
- B. cannot be made by higher organisms
- C. keeps membranes fluid.
- D. spans the thickness of the bilayer Discuss
- 4. The model that is now known to be correct for the structure of biological membrane is
Options- A. Fluid mosaic model
- B. Page's model
- C. Lac Operon model
- D. Lock and Key model Discuss
- 5. The membrane proteins that catalyze active transport reactions differ from soluble enzymes as
Options- 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 Discuss
- 6. In active transport, the membrane structure that functions is
Options- A. cholesterol
- B. integral proteins
- C. carbohydrates
- D. hydrophobic molecules Discuss
- 7. 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
- 8. Pinocytosis occurs in
Options- A. all eukaryotic cells
- B. all prokaryotic cells
- C. mitochondria of all cells
- D. none of these Discuss
- 9. Which of the following is not found in membranes?
Options- A. Glycoproteins
- B. Glycolipids
- C. Nucleic acids
- D. Phospholipids Discuss
- 10. 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
Membrane Structure and Functions problems
Search Results
Correct Answer: out of the cell across the plasma membrane into the extracellular space
Correct Answer: all of the above
Correct Answer: keeps membranes fluid.
Correct Answer: Fluid mosaic model
Correct Answer: the products of the reaction move in a specific direction
Correct Answer: integral proteins
Correct Answer: the single hydroxyl along with the hydrocarbon nature of the remainder of the molecule
Correct Answer: all eukaryotic cells
Correct Answer: Nucleic acids
Correct Answer: All of the above
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