MCQs On Plasma Membrane For NEET

Plasma Membrane Multiple Choice Question and Answers

Question 1. Phagocytosis was first seen by:

1. Huxley
2. Hacckel
3. Meteclmioff
4. Strasburger

Answer: 3. Meteclmioff

Question 2. In the process of osmosis :

1. Both protoplasm and cell wall act as a single layer
2. Only protoplast acts as a single layer
3. Only the cell membrane acts as a single layer
4. None of the above.

Answer: 3. Only the cell membrane acts as a single layer

Question 3. Desmosomes are concerned with:

1. Cell division
2. Cellular excretion
3. Cyclosis
4. Cell adherence.

Answer: 4. Cell adherence.

Question 4. The main difference between active and passive transport across the cell membrane is that :

1. Active transport is rapid
2. Passive transport is non-selective
3. Passive transport requires a concentration gradient across the membrane
4. 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:

1. Lipids
2. Proteins
3. Glycolipids and glycoproteins
4. 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?

1. Water potential
2. Root pressure
3. Diffusion
4. Plasmolysis.

Answer: 4. Plasmolysis.

Question 7. Molecules of which size can pass passively through the membrane?

1. 8 -10 A
2. 18-20 A
3. 28-30 A
4. 38-40.8.

Answer: 1. 8 -10 A

Question 8. Which of the following causes the softening of fruits?

1. Citric acid
2. Magnesium
3. Pectin
4. Iron.

Answer: 3. Pectin

Question 9. In higher plants, the cell wall consists of :

1. Callose
2. Peptidoglycan
3. Cellulose
4. Lipoprotein.

Answer: 3. Cellulose

Question 10. The osmolarity of cells is due to the:

1. K+
2. Na+
3. Ca++
4. Cl-

Answer: 1. K+

Question 11. The cell wall of diatoms is made up of :

1. Silica
2. Carbonate
3. Calcium carbonate
4. All the above.

Answer: 1. Silica

Question 12. The biomembranes are

1. Unilaminar
2. Bilaminar
3. Trilaminar
4. Quadrilaminar.

Answer: 3. Trilaminar

Question 13. Two important processes in a cell, which take place outside the membrane-bound organelles, are:

1. Enzyme synthesis and dna replication
2. Fatty acid synthesis and spindle assembly
3. Glycolysis and photophosphorylation
4. 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 :

1. A monomolecular layer of protein
2. A bimolecular layer of lipid and protein
3. Made up of lipoprotein
4. 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:

1. L, -p, -l, -p
2. L, -p, -p, -l
3. P, -p,-l,-l
4. P,-l,-l,-p.

Answer: 4. P,-l,-l,-p.

Question 16. Atp molecules combine with carrier molecules and allow passage of substances :

1. Along concentration gradient
2. Against concentration gradient
3. Both a and b
4. 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 :

1. Diffusion
2. Passive transport
3. Active transport
4. Pinocytosis.

Answer: 3. Active transport

Question 18. Intake of liquid food is :

1. Pinocytosis
2. Phagocytosis
3. Imbibition
4. None of the above.

Answer: 1. Pinocytosis

Question 19. Ion carriers are located in :

1. Cell membrane
2. Primary cell wall
3. Nucleus
4. Intercellular spaces.

Answer: 1. Cell membrane

Question 20. The plasma membrane is made up of :

1. Carbohydrates and fats
2. Carbohydrates and proteins
3. Proteins and fats
4. Fats only.

Answer: 3. Proteins and fats

Question 21. Fluid mosaic model plasma membrane was given by :

1. Singer and Nicholson
2. Beadle and Tatum
3. Watson and crick
4. Robertson and Miller.

Answer: 1. Singer and Nicholson

Question 22. In the fluid mosaic model, the plasma membrane has :

1. A central bilayer of proteins
2. A bilayer of phospholipids
3. Hydrophobic non-polar tails
4. 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:

1. Impermeable to anthocyanin
2. Permeable to anthocyanin
3. Differentially permeable to anthocyanin
4. 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?

1. Osmosis
2. Diffusion
3. Active transport
4. Surface tension.

Answer: 4. Surface tension.

Question 25. What is true of the fluid mosaic model :

1. Phospholipid monolayer is present over the protein layer
2. Phospholipid bilayer is present over the protein layer
3. Protein embedded in phospholipid bilayer
4. 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 :

1. Na+
2. Car+
3. K+
4. 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?

1. Proteins can remain confined within certain domains of the membrane.
2. Proteins in cell membranes can travel within the lipid bilayer.
3. Proteins can also undergo flip-flop movements in the lipid bilayer.
4. 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.

1. Proteins make up 6o to 70vo of the cell membrane.
2. Lipids are arranged in a bilayer with polar heads towards the inner part.
3. The fluid mosaic model of the cell membrane was proposed by Singer and Nicolson.
4. 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.

1. Glycocalyx is the outermost envelope in bacteria.
2. The glycocalyx could be a loose sheath called a capsule.
3. The glycocalyx may be thick and tough called the slime layer.
4. A special structure formed by the plasma membrane is called a mesosome.
5. Small bristle-like fibers sprouting out of the cell are called fimbriae

Choose The Correct Answer:

1. 1 And 3 are wrong
2. 1 And 2 are wrong
3. 2 And 3 are wrong
4. 1 And 4 are wrong
5. 3 And 4 are wrong Gerla

Answer: 3. 2 And 3 are wrong