Cell Membrane

Front

What is a phospholipid?

Back

A phospholipid is a type of lipid molecule that is a major component of cell membranes, consisting of a hydrophilic 'head' and two hydrophobic 'tails'.

Front

What part of a phospholipid is hydrophobic?

Back

The lipid 'tails' are hydrophobic, meaning they repel water.

Front

What is the primary function of the plasma membrane?

Back

The primary function of the plasma membrane is to regulate what enters and leaves the cell.

Front

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

Back

Lipid is the main component of the plasma membrane.

Front

What does 'polar' mean in the context of molecules?

Back

A polar molecule has areas of positive and negative charge due to an uneven distribution of electrons.

Front

What type of bond forms between water molecules?

Back

Water molecules attract each other through hydrogen bonds, which are a type of Van Der Waals force.

Front

What is the role of proteins in the plasma membrane?

Back

Proteins in the plasma membrane assist in transport, act as receptors, and provide structural support.

Front

What is the significance of the fluid mosaic model?

Back

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

Front

What is the difference between hydrophilic and hydrophobic substances?

Back

Hydrophilic substances are attracted to water, while hydrophobic substances repel water.

Front

What is selective permeability?

Back

Selective permeability is the ability of the plasma membrane to allow certain substances to pass while blocking others.