Cell Membrane Structure and Function

Play an AI-generated podcast conversation about this lesson

What is the primary structural component of the cell membrane?

Glycoprotein

Phospholipid bilayer (correct)

Hydrophobic tail

Carbohydrate chain

Which component of the cell membrane is responsible for cell-cell recognition?

External surface membrane

Hydrophobic tail

Internal surface membrane

Glycolipid (correct)

What is the main energy requirement for active transport?

It requires light energy.

It does not require any energy.

It requires chemical energy from glucose.

It requires cellular energy in the form of ATP. (correct)

Where are the hydrophilic heads of phospholipids oriented in the cell membrane?

Both A and C Signup and view all the answers

Which process is involved in the ingestion of large particles by cells?

Phagocytosis Signup and view all the answers

During facilitated diffusion, materials pass through what?

Transport proteins Signup and view all the answers

What type of molecules can perform diverse functions such as transport within the cell membrane?

Protein molecules Signup and view all the answers

Which component of the membrane is not directly part of the phospholipid bilayer?

External surface membrane Signup and view all the answers

What distinguishes simple diffusion from facilitated diffusion?

Simple diffusion involves small, non-polar molecules. Signup and view all the answers

What is the primary role of the sodium-potassium pump?

To establish an ion concentration gradient. Signup and view all the answers

Which of the following statements accurately describes the role of the cell membrane?

It selectively controls what enters and leaves the cell. Signup and view all the answers

What is primarily responsible for the flexibility of the cell membrane?

Phospholipid bilayer arrangement Signup and view all the answers

Which factor does NOT affect the rate of diffusion across the cell membrane?

Color of the molecules Signup and view all the answers

How do non-polar molecules primarily travel through the cell membrane?

By dissolving in the hydrophobic interior Signup and view all the answers

What happens to a cell placed in a hypertonic solution?

The cell shrinks and may undergo plasmolysis. Signup and view all the answers

Which type of molecules can pass through a selectively permeable membrane most easily?

Small non-polar molecules Signup and view all the answers

What is the primary direction of water movement during osmosis?

From low solute concentration to high solute concentration Signup and view all the answers

What effect does temperature have on the rate of diffusion?

Increased temperature generally increases the rate of diffusion. Signup and view all the answers

Which statement about the fluid mosaic model is true?

It describes a dynamic structure of various components. Signup and view all the answers

What characteristic of a semi-permeable membrane is essential for maintaining homeostasis?

It selectively permits certain molecules to cross. Signup and view all the answers