Membrane Structure and Functions problems
- 1. The movement of molecules across a membrane by passive transport does not require
Options- A. an input of metabolic energy
- B. internal energy
- C. vibrational energy
- D. none of these Discuss
Correct Answer: an input of metabolic energy
- 2. Which of the following is correct?
Options- A. Membranes form boundaries around the cell and distinct subcellular components
- B. Membranes act as selectively permeable barrier
- C. Membranes contain varying amount of lipid and protein and some contain small amount of carbohydrates
- D. All of the above Discuss
Correct Answer: All of the above
- 3. The mesosomes may be the sites of
Options- A. DNA replication and specialized enzymatic reactions
- B. RNA replications and specialized enzymatic reactions
- C. RNA replications and specialized cyclic reactions
- D. None of the above Discuss
Correct Answer: DNA replication and specialized enzymatic reactions
- 4. Which type of molecule spans the membrane, from its inner to outer surface according to the Fluid mosaic model of cell membranes?
Options- A. Cholesterol
- B. Phospholipid
- C. Protein
- D. Carbohydrate Discuss
Correct Answer: Protein
- 5. Peptidoglycan is a complex consisting of
Options- A. oligo-saccharide and protein
- B. polysaccharide and protein
- C. mono-saccharide and protein
- D. aminoacid and carbohydrate Discuss
Correct Answer: oligo-saccharide and protein
- 6. Lysozymes are found in
Options- A. plant cells
- B. animal cells
- C. microbial cells
- D. all of these Discuss
Correct Answer: plant cells
- 7. 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
Correct Answer: the products of the reaction move in a specific direction
- 8. 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
Correct Answer: Fluid mosaic model
- 9. 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
Correct Answer: keeps membranes fluid.
- 10. 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
Correct Answer: all of the above
More in Biochemistry:
Programming
Copyright ©CuriousTab. All rights reserved.