Plasma Membrane Multiple Choice Question and Answers
Question 1. Phagocytosis was first seen by:
- Huxley
- Hacckel
- Meteclmioff
- Strasburger
Answer: 3. Meteclmioff
Question 2. In the process of osmosis :
- Both protoplasm and cell wall act as a single layer
- Only protoplast acts as a single layer
- Only the cell membrane acts as a single layer
- None of the above.
Answer: 3. Only the cell membrane acts as a single layer
Question 3. Desmosomes are concerned with:
- Cell division
- Cellular excretion
- Cyclosis
- Cell adherence.
Answer: 4. Cell adherence.
Question 4. The main difference between active and passive transport across the cell membrane is that :
- Active transport is rapid
- Passive transport is non-selective
- Passive transport requires a concentration gradient across the membrane
- Active transport does not require energy while passive transport requires.
Answer: 3. Passive transport requires a concentration gradient across the membrane
Question 5. Cellular recognition and adhesion are facilitated by components in the plasma membrane. They are:
- Lipids
- Proteins
- Glycolipids and glycoproteins
- Both and 1 and 2.
Answer: 3. Glycolipids and glycoproteins
Question 6. Which of the following phenomena can be employed to clear a patch of land of grass and unwanted plant growth?
- Water potential
- Root pressure
- Diffusion
- Plasmolysis.
Answer: 4. Plasmolysis.
Question 7. Molecules of which size can pass passively through the membrane?
- 8 -10 A
- 18-20 A
- 28-30 A
- 38-40.8.
Answer: 1. 8 -10 A
Question 8. Which of the following causes the softening of fruits?
- Citric acid
- Magnesium
- Pectin
- Iron.
Answer: 3. Pectin
Question 9. In higher plants, the cell wall consists of :
- Callose
- Peptidoglycan
- Cellulose
- Lipoprotein.
Answer: 3. Cellulose
Question 10. The osmolarity of cells is due to the:
- K+
- Na+
- Ca++
- Cl-
Answer: 1. K+
Question 11. The cell wall of diatoms is made up of :
- Silica
- Carbonate
- Calcium carbonate
- All the above.
Answer: 1. Silica
Question 12. The biomembranes are
- Unilaminar
- Bilaminar
- Trilaminar
- Quadrilaminar.
Answer: 3. Trilaminar
Question 13. Two important processes in a cell, which take place outside the membrane-bound organelles, are:
- Enzyme synthesis and dna replication
- Fatty acid synthesis and spindle assembly
- Glycolysis and photophosphorylation
- Nucleotide synthesis and mutation.
Answer: 3. Glycolysis and photophosphorylation
Question 14. The continuity between the nucleoplasm and cytoplasm is due to the plasma membrane, which is :
- A monomolecular layer of protein
- A bimolecular layer of lipid and protein
- Made up of lipoprotein
- Made up of polysaccharides.
Answer: 2. Bimolecular layer of lipid and protein
Question 15. According to the fluid mosaic model, the correct sequence of plasmalemma is:
- L, -p, -l, -p
- L, -p, -p, -l
- P, -p,-l,-l
- P,-l,-l,-p.
Answer: 4. P,-l,-l,-p.
Question 16. Atp molecules combine with carrier molecules and allow passage of substances :
- Along concentration gradient
- Against concentration gradient
- Both a and b
- ATP is not required.
Answer: 2. Against concentration gradient
Question 17. The movement of ions or molecules against the prevailing direction of the electrochemical gradient is :
- Diffusion
- Passive transport
- Active transport
- Pinocytosis.
Answer: 3. Active transport
Question 18. Intake of liquid food is :
- Pinocytosis
- Phagocytosis
- Imbibition
- None of the above.
Answer: 1. Pinocytosis
Question 19. Ion carriers are located in :
- Cell membrane
- Primary cell wall
- Nucleus
- Intercellular spaces.
Answer: 1. Cell membrane
Question 20. The plasma membrane is made up of :
- Carbohydrates and fats
- Carbohydrates and proteins
- Proteins and fats
- Fats only.
Answer: 3. Proteins and fats
Question 21. Fluid mosaic model plasma membrane was given by :
- Singer and Nicholson
- Beadle and Tatum
- Watson and crick
- Robertson and Miller.
Answer: 1. Singer and Nicholson
Question 22. In the fluid mosaic model, the plasma membrane has :
- A central bilayer of proteins
- A bilayer of phospholipids
- Hydrophobic non-polar tails
- Hydrophilic polar heads.
Answer: 2. A bilayer of phospholipids
Question 23. A beetroot slice is first washed with water and then placed in ice-cooled water. It does not lose its anthocyanin pigment. It suggests that the plasma membrane is:
- Impermeable to anthocyanin
- Permeable to anthocyanin
- Differentially permeable to anthocyanin
- Dead. Ghd.
Answer: 1. Impermeable to anthocyanin
Question 24. Which of the following is not concerned with movement of materials into and out of the cell?
- Osmosis
- Diffusion
- Active transport
- Surface tension.
Answer: 4. Surface tension.
Question 25. What is true of the fluid mosaic model :
- Phospholipid monolayer is present over the protein layer
- Phospholipid bilayer is present over the protein layer
- Protein embedded in phospholipid bilayer
- The phospholipid layer is sandwiched between two protein layers.
Answer: 3. Protein embedded in the phospholipid bilayer
Question 26. Ion connected with forming crossbridges is :
- Na+
- Car+
- K+
- None of the above.
Answer: 2. Car+
Question 27. According to the widely accepted “fluid mosaic model cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statements is incorrect?
- Proteins can remain confined within certain domains of the membrane.
- Proteins in cell membranes can travel within the lipid bilayer.
- Proteins can also undergo flip-flop movements in the lipid bilayer.
- Many proteins remain completely embedded within the lipid bilayer.
Answer: 4. Many proteins remain completely embedded within the lipid bilayer.
Question 28. Select the correct statement from the following regarding cell membranes.
- Proteins make up 6o to 70vo of the cell membrane.
- Lipids are arranged in a bilayer with polar heads towards the inner part.
- The fluid mosaic model of the cell membrane was proposed by Singer and Nicolson.
- Na+ and k+ions move across cell membranes by passive transport.
Answer: 3. Fluid mosaic model of cell membrane was proposed by singer and Nicolson.
Question 29. Choose the wrong statements regarding bacterial cells.
- Glycocalyx is the outermost envelope in bacteria.
- The glycocalyx could be a loose sheath called a capsule.
- The glycocalyx may be thick and tough called the slime layer.
- A special structure formed by the plasma membrane is called a mesosome.
- Small bristle-like fibers sprouting out of the cell are called fimbriae
Choose The Correct Answer:
- 1 And 3 are wrong
- 1 And 2 are wrong
- 2 And 3 are wrong
- 1 And 4 are wrong
- 3 And 4 are wrong Gerla
Answer: 3. 2 And 3 are wrong
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