Cell Membrane and Transport Quiz

What is the function of the cell membrane?

• Controls the movement of organelles within the cell

• Prevents any material from entering or leaving the cell

• Allows all materials to pass through

• Regulates what enters and leaves the cell

Answer explanation

The cell membrane regulates what enters and leaves the cell.

What does it mean for the cell membrane to be semi-permeable?

• It allows some materials (not all) to pass through.

• It prevents any material from entering or leaving the cell.

• It allows only water to pass through.

• It allows all materials to pass through.

Answer explanation

The cell membrane is semi-permeable, allowing some materials (not all) to pass through.

Which term describes a state where there is an equal flow of water into and out of the cell?

• Hypertonic

• Hypotonic

• Isotonic

• Homeostasis

Answer explanation

Isotonic describes a state where there is equal flow of water into and out of the cell. It is the correct choice.

What happens in a hypertonic solution?

• More water enters the cell than leaves it.

• More water leaves the cell than enters it.

• There is no water movement in or out of the cell.

• There is an equal flow of water into and out of the cell.

Answer explanation

In a hypertonic solution, more water leaves the cell than comes into it. This causes the cell to shrink and become dehydrated.

What happens in a hypotonic solution?

• Equal flow of water into and out of the cell

• More water entering the cell than leaving it

• More water leaving the cell than coming into it

• No water movement in or out of the cell

Answer explanation

In a hypotonic solution, more water enters the cell than leaves it. This causes the cell to swell and potentially burst.

What is the main component of the cell membrane?

• Phospholipid head

• Phospholipid tail

• Bilayer

• Solute

Answer explanation

The main component of the cell membrane is the bilayer, which consists of phospholipids. It forms a barrier that separates the cell from its surroundings and controls the movement of substances in and out of the cell.

Which part of the phospholipid is hydrophilic and polar?

• Phospholipid head

• Phospholipid tail

• Bilayer

• Solute

Answer explanation

The hydrophilic and polar part of the phospholipid is the phospholipid head, which interacts with water molecules due to its polar nature.

Which part of the phospholipid is hydrophobic and non-polar?

• Phospholipid head

• Solute

• Bilayer

• Phospholipid tail

Answer explanation

The hydrophobic and non-polar part of the phospholipid is the phospholipid tail, which is responsible for forming the hydrophobic core of the bilayer.

What is a bilayer?

• A layer of solute molecules

• A layer of solvent molecules

• A double layer of phospholipids

• A single layer of phospholipids

Answer explanation

A bilayer is a double layer of phospholipids.

What is a solute?

• A homogeneous mixture

• Consistent throughout

• A liquid substance capable of dissolving other substances

• The substance that is dissolved

Answer explanation

A solute is the substance that is dissolved in a liquid. It is not a homogeneous mixture or the same throughout. It is a liquid substance capable of dissolving other substances.