Cell Membrane Structure POGIL Review

Front

What is the structure of a cell membrane?

Back

The cell membrane is primarily composed of a phospholipid bilayer, with embedded proteins, cholesterol, and carbohydrates. The hydrophilic (water-attracting) heads face outward, while the hydrophobic (water-repelling) tails face inward.

Front

Define polar molecules.

Back

Polar molecules are molecules that have a partial positive charge on one end and a partial negative charge on the other end, due to an unequal distribution of electrons. This property allows them to interact with water.

Front

Define nonpolar molecules.

Back

Nonpolar molecules are molecules that do not have distinct positive or negative poles, meaning they have an equal distribution of electrical charge. They do not interact well with water.

Front

What does hydrophobic mean?

Back

Hydrophobic refers to substances that repel water. These substances do not mix with water and are typically nonpolar.

Front

What does hydrophilic mean?

Back

Hydrophilic refers to substances that are attracted to water. These substances can interact with water and are typically polar.

Front

What is the role of transport proteins in the cell membrane?

Back

Transport proteins facilitate the movement of substances across the cell membrane, allowing polar or hydrophilic substances to enter or exit the cell.

Front

What is a phospholipid?

Back

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

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 that might otherwise pass freely through.

Front

What is a functional group?

Back

A functional group is a specific group of atoms within a molecule that is responsible for the characteristic chemical reactions of that molecule.

Front

Identify the phosphate group in a molecule.

Back

The phosphate group consists of a phosphorus atom bonded to four oxygen atoms, one of which is double-bonded. It is often found in nucleotides and phospholipids.