Unit 4 Cells Test Review

Front

What is the cell theory?

Back

The cell theory states that: 1) All living things are made of cells, 2) Cells are the basic unit of life, 3) All cells come from pre-existing cells.

Front

What is a prokaryotic cell?

Back

A prokaryotic cell is a type of cell that does not have a nucleus or other membrane-bound organelles. Examples include bacteria.

Front

What is a eukaryotic cell?

Back

A eukaryotic cell is a type of cell that has a nucleus and membrane-bound organelles. Examples include plant and animal cells.

Front

What is osmosis?

Back

Osmosis is the movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

Define hypotonic solution.

Back

A hypotonic solution has a lower concentration of solutes compared to another solution, causing cells to swell as water enters.

Front

Define hypertonic solution.

Back

A hypertonic solution has a higher concentration of solutes compared to another solution, causing cells to shrink as water exits.

Front

Define isotonic solution.

Back

An isotonic solution has an equal concentration of solutes compared to another solution, resulting in no net movement of water.

Front

What role do cholesterol molecules play in the cell membrane?

Back

Cholesterol molecules help to stabilize the cell membrane's fluidity, making it less permeable to very small water-soluble molecules that might otherwise pass freely through.

Front

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

Back

Transport proteins facilitate the movement of substances across the cell membrane, either by passive transport or active transport.

Front

What is the lipid bilayer?

Back

The lipid bilayer is a double layer of phospholipids that makes up the cell membrane, providing a barrier to most water-soluble substances.