2024 Review: Cells

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 does Cell Theory state?

Back

Cell Theory states that all living things are made of cells, cells are the basic unit of life, and all cells come from existing cells.

Front

What is the significance of the statement 'Cells MUST have a nucleus'?

Back

This statement is incorrect; not all cells have a nucleus (e.g., prokaryotic cells).

Front

How do theories in science evolve?

Back

Theories can adapt and change when new information is discovered, reflecting the dynamic nature of scientific understanding.

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 Osmosis?

Back

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

Front

In osmosis, where does water move when salt is present?

Back

Water moves towards the area with more solutes (salts) to dilute them.

Front

What is the role of the cell membrane?

Back

The cell membrane controls the movement of substances in and out of the cell, maintaining homeostasis.

Front

What is diffusion?

Back

Diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration.

Front

What is a selectively permeable membrane?

Back

A selectively permeable membrane allows certain molecules to pass through while blocking others, crucial for maintaining cellular environment.