STAAR Biology Category 1

Front

What is osmosis?

Back

Osmosis is the movement of water from a high concentration to a low concentration across a semipermeable membrane.

Front

What does isotonic mean?

Back

Isotonic refers to a solution where the concentration of solutes is the same on both sides of a membrane.

Front

What is active transport?

Back

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

Front

What is exocytosis?

Back

Exocytosis is the process by which a cell removes large quantities of toxins and waste by packaging them in vesicles that fuse with the cell membrane.

Front

What is diffusion?

Back

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process of passive transport of molecules across a membrane via specific transmembrane integral proteins.

Front

What is a semipermeable membrane?

Back

A semipermeable membrane is a barrier that allows certain substances to pass through while blocking others.

Front

What is a hypotonic solution?

Back

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

Front

What is a hypertonic solution?

Back

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

Front

What role do proteins play in facilitated diffusion?

Back

Proteins act as channels or carriers that help specific molecules cross the cell membrane without using energy.