Module 2 Review

Front

What is the structure of a phospholipid in the cell membrane?

Back

Phospholipids have a hydrophilic (water-attracting) head and two hydrophobic (water-repelling) tails, allowing them to form a bilayer that separates the inside of the cell from the outside.

Front

What is diffusion?

Back

Diffusion is the process by which molecules move from an area of high concentration to an area of low concentration.

Front

What type of energy do muscle cells use during physical activity?

Back

Muscle cells use chemical energy, which is derived from the breakdown of glucose during cellular respiration.

Front

Which organelle is known as the powerhouse of the cell?

Back

The mitochondria are known as the powerhouse of the cell because they produce ATP, the energy currency of the cell.

Front

What happens to molecules during diffusion when equilibrium is reached?

Back

When equilibrium is reached, molecules continue to move, but there is no net change in concentration on either side of the membrane.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is the role of the cell membrane?

Back

The cell membrane regulates what enters and exits the cell, providing protection and support.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy.

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.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance between two areas.