Cell Membrane and Transport

Front

What forms the channels and pumps in the phospholipid bilayer?

Back

Proteins are responsible for forming channels and pumps in the phospholipid bilayer, facilitating the transport of substances across the cell membrane.

Front

What is the general name for movement of substances across cell membranes without need of energy input?

Back

Passive transport is the movement of substances across cell membranes without the need for energy input.

Front

Identify the part of the membrane identified as A: carbohydrate, cholesterol, protein, phospholipid.

Back

Phospholipid is a key component of the cell membrane, forming the bilayer structure.

Front

Which gases move into and out of the blood at the lungs by diffusion?

Back

Oxygen and Carbon Dioxide move into and out of the blood at the lungs by diffusion.

Front

True or false: Regulating what enters and leaves the cell helps the cell maintain homeostasis.

Back

True. Regulating the movement of substances helps maintain homeostasis within the cell.

Front

What is the structure of the cell membrane?

Back

The cell membrane is primarily composed of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates.

Front

Define active transport.

Back

Active transport is the movement of substances across a cell membrane against their concentration gradient, requiring energy.

Front

What role do carbohydrates play in the cell membrane?

Back

Carbohydrates are involved in cell recognition and signaling, often attached to proteins or lipids on the extracellular surface.

Front

What is the function of cholesterol in the cell membrane?

Back

Cholesterol helps to stabilize the fluidity of the cell membrane, making it less permeable to very small water-soluble molecules.

Front

Explain the concept of selective permeability.

Back

Selective permeability refers to the ability of the cell membrane to allow certain substances to pass while blocking others.