In facilitated diffusion, molecules move across the membrane with the help of:
ATP hydrolysis
Membrane proteins
Concentration gradient against their movement
Vesicle formation
Related Questions
Select the incorrect statement about plasma membrane
It is selectively permeable.
It is composed of a phospholipid bilayer.
It contains proteins.
It is primarily composed of carbohydrates.
What is the function of cholesterol in the cell membrane?
Provide structural support
Transport molecules
Maintain fluidity
Act as receptors
The process by which a cell engulfs large particles or even other cells is called:
Pinocytosis
Exocytosis
Osmosis
Phagocytosis
During DNA replication in prokaryotes, DNA is anchored to
the cell membrane
the nuclear membrane
the nucleolus
the histone proteins
The fluidity of the cell membrane is primarily influenced by the:
Amount of cholesterol present
Saturation level of fatty acid tails in phospholipids
Concentration of peripheral proteins
Presence of glycoproteins
The plasma membrane consists mainly of
Phospholipids embedded in a protein bilayer
Proteins embedded in a phospholipid bilayer
Proteins embedded in a polymer of glucose molecules
Proteins embedded in a carbohydrate bilayer
Lipid bilayer is present in
Plasma membrane
Ribosome
Chromosome
Nucleolus
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.
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
Cell membrane is made up of
Protein
Cellulose
Lipids
Lipids, carbohydrates and protein
