🧫 Cells – Year 7 2025

exams

What is a cell?

The smallest unit of life.

What tool is used to observe cells?

A microscope.

What is the function of the nucleus?

t controls the cell’s activities.

What is the function of the cell membrane?

Controls what goes in and out of the cell.

What is cytoplasm?

A jelly-like fluid where chemical reactions happen.

What do mitochondria do?

they release energy from food through respiration — known as the “powerhouse” of the cell.

What is the function of the vacuole?

Stores water and nutrients; helps maintain the cell’s shape (larger in plant cells).

What do chloroplasts do?

they perform photosynthesis, converting sunlight into chemical energy in the form of glucose, while also producing oxygen as a byproduct.

What does the cell wall do?

Provides structure and support; found only in plant cells.

What are ribosomes?

Small structures that make proteins for the cell

What is the difference between plant and animal cells?

Plant cells have a cell wall, chloroplasts, and a large vacuole; animal cells don’t.

What is a tissue?

A group of similar cells working together to perform a function.

What is an organ?

A structure made of different tissues that works to do a specific job.

What is an organ system?

A group of organs that work together

What is the difference between unicellular and multicellular organisms?

Unicellular = one cell (e.g. bacteria); multicellular = many cells (e.g. humans).

What is the endoplasmic reticulum (ER)?

A network of membranes that helps move materials around the cell.

What is the difference between rough and smooth ER?

rough ER has ribosomes and helps make proteins; smooth ER has no ribosomes and makes lipids (fats) and detoxifies chemicals.

What does the Golgi apparatus (or Golgi body) do?

It packages and sends proteins and other materials to where they are needed in the cell or out of it.

What is the function of a lysosome?

What is the function of a lysosome?