Cell Structure and Function

What is the role of the plasma membrane in endocytosis?

• Releasing ATP
• Breaking down DNA
• Storing ions
• Engulfing external materials to form vesicles

What is the main function of aquaporins?

• Transport ions
• Synthesize ATP
• Produce proteins
• Facilitate the movement of water across the membrane

What is the role of glycoproteins in the cell membrane?

• Energy production
• DNA replication
• Protein synthesis
• Cell recognition and signaling

Which of the following is a characteristic of the fluid mosaic model?

• Membrane is rigid and static
• All proteins span the entire membrane
• Membrane is entirely hydrophilic
• Membrane proteins float in a lipid bilayer

What is the correct order of cell wall layers from outermost to innermost in a mature plant cell?

• Primary wall → Middle lamella → Secondary wall
• Secondary wall → Primary wall → Middle lamella
• Middle lamella → Secondary wall → Primary wall
• Middle lamella → Primary wall → Secondary wall