Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
The presence of hopanoids in some prokaryotic plasma membranes primarily contributes to:
Protein synthesis
Nutrient transport
Membrane stability
Photosynthesis
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
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
Which component of the cell membrane is primarily responsible for its selective permeability?
Glycoproteins
Peripheral proteins
Phospholipid bilayer
Cholesterol
Which of the following is the primary component of the cell membrane?
Carbohydrates
Proteins
Nucleic acids
Phospholipids
Which part of the phospholipid is hydrophobic?
Phosphate head
Glycerol backbone
Fatty acid tails
Entire molecule
In a biological system, the diffusion of a lipophilic substance across a cell membrane is primarily limited by:
The hydrophobic core of the lipid bilayer
The aqueous unstirred layers adjacent to the membrane
The presence of membrane proteins
The concentration gradient of the substance
Which of the following statements accurately differentiates Archaebacteria from Eubacteria?
Archaebacteria have peptidoglycan in their cell walls, while Eubacteria do not.
Archaebacteria lack introns in their genes, while Eubacteria have introns.
Archaebacteria have branched chain lipids in their cell membranes, while Eubacteria have straight chain lipids.
Archaebacteria are sensitive to antibiotics, while Eubacteria are resistant.
A rare genetic disorder affects lipid metabolism by impairing the synthesis of plasmalogens. Which membrane component would be MOST directly affected?
Mitochondrial inner membrane
Nuclear envelope
Myelin Sheath
Lysosomal membrane
Which of the following is NOT a function of cardiolipin?
Stabilizing the structure of respiratory chain complexes
Facilitating mitochondrial cristae formation
Major component of cell membrane fluidity
Apoptosis regulation
