Cell Biology Review

Front

What is the function of lysosomes in a cell?

Back

Lysosomes digest dead cell parts and contain enzymes that break down waste materials.

Front

Why does a cell require energy to move molecules against the concentration gradient?

Back

The cell needs energy because the molecule is moving from an area of low concentration to an area of high concentration, which is against the natural flow.

Front

What indicates that a molecule is in equilibrium?

Back

A molecule is in equilibrium when there are equal amounts of it inside and outside the cell.

Front

What organelle is responsible for converting sunlight into chemical energy during photosynthesis?

Back

Chloroplasts are responsible for converting the radiant energy of the sun into the chemical energy of glucose.

Tags

NGSS.HS-LS1-5

Front

Define facilitated diffusion.

Back

Facilitated diffusion is the movement of molecules across the cell membrane from an area of high concentration to an area of low concentration, aided by transport proteins.

Tags

NGSS.HS-LS2-3

Front

What is the role of the cell membrane?

Back

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

Tags

NGSS.MS-LS1-2

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 are the main components of the cell membrane?

Back

The cell membrane is primarily composed of a phospholipid bilayer, proteins, cholesterol, and carbohydrates.

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 significance of the concentration gradient in cellular processes?

Back

The concentration gradient is crucial for processes like diffusion and osmosis, as it drives the movement of substances across membranes.