Georgia Milestone Biology Review-Cells

Front

What is the function of embedded proteins in the plasma membrane?

Back

Embedded proteins allow certain kinds of molecules to enter or leave a cell.

Front

What happens to water in a 20% sucrose solution compared to a 35% sucrose solution separated by a permeable membrane?

Back

Water will move from compartment A (20% sucrose) to compartment B (35% sucrose) by osmosis.

Front

What occurs when a balloon with a 10% sugar solution is placed in a 5% sugar solution?

Back

The balloon will gain water by osmosis.

Front

Define diffusion in biological terms.

Back

Diffusion occurs when particles spread from areas where they are more concentrated to areas where they are less concentrated.

Front

What role do enzymes play in metabolic reactions?

Back

Enzymes speed up metabolic reactions, allowing organisms to get energy quickly.

Front

What is osmosis?

Back

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

Front

What is the difference between active transport and passive transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their concentration gradient.

Front

What is a selectively permeable membrane?

Back

A selectively permeable membrane allows certain substances to pass through while blocking others.

Front

What is the concentration gradient?

Back

The concentration gradient is the difference in the concentration of a substance across a space.

Front

How do temperature and concentration affect the rate of diffusion?

Back

Higher temperatures and greater concentration differences increase the rate of diffusion.