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Membrane Structure and Functions (Biochemistry) Question and Answers-Page first

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
  • 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
  • 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
  • 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
  • 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
  • 6. Lysozymes are found in

  • Options
  • A. plant cells
  • B. animal cells
  • C. microbial cells
  • D. all of these
  • Discuss
  • 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
  • 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
  • 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
  • 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

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