Science

Chapter 1 – Lesson 1

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What are cells?

An organism is a living thing. A cell is the smallest unit of living things that can carry out the basic processes of life. Cells come from other cells.

A unicellular organism is made of a single cell.

A multicellular organism is made up of more than one cell.

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What is inside an animal cell?

Cells have basic structures called organelles,that help them perform life processes.

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Parts of an animal cell

•Cell Membrane•Cytoplasm•Nucleus•Mitochondria•Vacuoles

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Cell Membrane

The cell membrane is a flexible Wrapping around the animal cell.

The cell membrane is filled with a gel-like

liquid called cytoplasm. Cytoplasm is made mostly of water.

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Nucleus

The nucleus is the cell’s control center.

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Mitochondria

Mitochondria are oval, membrane Covered organelles that supply energy for the Cell. It is a tiny power plant.

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Vacuole

A vacuole is a membrane covered structureused for storage. It can store water, food and wastes. (vacuum)

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Answer the following questions:

*How are mitochondria similar to a power plant?

*Do you think a cell would function without a nucleus? Explain your answer.

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What is inside a plant cell?

•Mitochondria•Vacuole•Nucleus•Cytoplasm•Cell wall•Cell membrane•Chloroplasts Created by I.

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Plant Cells

Plant cells have an additional outer coveringaround the outside of the cell. It is called

the cell wall.

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Plants make their own food in structures

inside their cells called chloroplasts.

Chloroplasts are green because they contain

a chemical called chlorophyll.

Chloroplasts

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Answer the following question:

*Which cell has a stronger outer covering- a plant cell or an animal cell? Why do you think so?

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How are cells organized?

Cells working together at the same job, or

function form a tissue. A group of tissuesthat work together to perform a special

function form an organ. OrgansWorking together form an

organ system.

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