Cell Membrane

Front

What is the primary function of the cell membrane?

Back

The primary function of the cell membrane is to act as a protective outer layer that controls what enters and leaves the cell.

Front

What type of biological macromolecule is the main component of the plasma membrane?

Back

Lipid.

Front

What does it mean for a membrane to be selectively permeable?

Back

It means that some molecules can cross the membrane while others cannot.

Front

What role do proteins play in the cell membrane?

Back

Proteins act as gatekeepers, allowing certain substances to enter and exit the cell, and they also function as enzyme receptors.

Front

Which molecules typically require assistance to cross the cell membrane?

Back

Large or charged (polar) molecules.

Front

What are the two main types of proteins found in the cell membrane?

Back

Integral proteins and peripheral proteins.

Front

How do integral proteins function in the cell membrane?

Back

Integral proteins span the membrane and can facilitate the transport of substances across the membrane.

Front

What is the fluid mosaic model?

Back

The fluid mosaic model describes the structure of the cell membrane as a mosaic of various components (lipids, proteins, carbohydrates) that move fluidly within the layer.

Front

What is the significance of cholesterol in the cell membrane?

Back

Cholesterol helps to stabilize the membrane's fluidity and integrity.

Front

What is the difference between passive and active transport?

Back

Passive transport does not require energy and moves substances down their concentration gradient, while active transport requires energy to move substances against their concentration gradient.