The cell membrane maintains a distinct phospholipid composition between its inner and outer leaflets. Which of the following transport mechanisms is primarily responsible for establishing and maintaining this asymmetry?
Simple diffusion
Facilitated diffusion
Flippases
Ion channels
Related Questions
During DNA replication in prokaryotes, DNA is anchored to
the cell membrane
the nuclear membrane
the nucleolus
free-floating ribosomes
According to Singer and Nicolson model of cell membrane
The quasi-fluid nature of lipid enables lateral movement of protein within over all bilayer
The quasi-fluid nature of protein enables lateral movement of lipid
Peripheral proteins are totally buried in the phospholipid bilayer
Tunnel proteins lie on the surface of cell membrane
A widely accepted, improved model of cell membrane is
Fluid mosaic model
Robertson’s model
Danielli and Davson’s mod
Unit membrane model
In facilitated diffusion, molecules move across the membrane with the help of:
ATP hydrolysis
Membrane proteins
Concentration gradient against their movement
Vesicle formation
Plasma membrane is made up of
Lipid, protein and water
Lipid, protein and manganese
Lipid and carbohydrate
Lipid, protein and carbohydrates
Most common type of lipids found in plasma membrane is A and they show B__ movement with in the plasma membrane. Choose the most appropriate option to fill A and B.
Phospholipids; Lateral
Glycolipids; Transverse
Cholesterol; Rotational
Steroids; Flip-flop
Fluid nature of plasma membrane helps in all, except
Cell growth and division
Formation of intercellular junctions
Endocytosis and exocytosis
Providing mechanical strength
The fluidity of membranes in a plant in cold weather may be maintained by
Increasing the number of phospholipids with unsaturated hydrocarbon tails
Increasing the proportion of integral proteins
Increasing concentration of cholesterol in membrane
Increasing the number of phospholipids with saturated hydrocarbon tail
Lipid rafts are specialized microdomains within the cell membrane. Which of the following statements about their composition and function is INCORRECT?
They are enriched in cholesterol and sphingolipids.
They are involved in signal transduction and membrane trafficking.
They exhibit reduced fluidity compared to the surrounding membrane.
They are primarily composed of unsaturated phospholipids and peripheral membrane proteins.
Fluid nature of plasma membrane helps in all, except
Formation of intercellular junction
Cell growth and cell division
Lateral movement of proteins within the overall lipid bilayer
Active transport through ion channels
