Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
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 fluidity of the cell membrane is influenced by several factors. Which of the following would DECREASE membrane fluidity?
Increased proportion of unsaturated fatty acids
Shorter fatty acid chain length
Increased cholesterol content at high temperatures
Decreased cholesterol content at low temperatures
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
What is the function of cholesterol in the cell membrane?
Provide structural support
Transport molecules
Maintain fluidity
Act as receptors
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
Formation of intercellular junction
Cell growth and cell division
Lateral movement of proteins within the overall lipid bilayer
Active transport through ion channels
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
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
