Cell Theory

SNC1L

Cell Theory

1. All living things are composed of one or more cells.

A drawing of cork seen through a microscope by Robert Hooke.

Single-Celled Organisms

Single-celled organisms include bacteria and protists like amoebae.

Animal Cells

Multi-celled animals are made up of many different kinds of specialized cells.

Plant Cells

Plants are similarly made up of different types of cells.

There are differences between plant cells and animal cells. For example, plant cells have structural cell walls.

The green colour comes from

chloroplasts.

Cell Theory

2. The cell is the basic unit of structure, function, and organization in all organisms.

Cell Activity

Cells take in nutrients from their environment and release waste products to their environment through the cell membrane.

Cell Activity

Cell activity is regulated by the cell nucleus.

nucleus

Cell Activity

The activity of an organism is the result of the activity of its independent cells.

Cell Theory

3. All cells come from pre-existing, living cells.

Mitosis

Cells divide to make copies of themselves.

Your Task

Prepare wet mount slides to observe plant (onion) and animal (human cheek) cells under the microscope.

These are cheek cells. These are air bubbles.