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Science
Chapter 1 – Lesson 1
Created by I. Cavalli
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 structure
used for storage. It can store water, food
and wastes.
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Answer the following questions:
*How is 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
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Plant Cells
Plant cells have an additional outer covering
around the outside of the cell. It is called
the cell wall.
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Chloroplasts
Plants make their own food in structures
inside their cells called chloroplasts.
Chloroplasts are green because they contain
a chemical called chlorophyll.
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Answer the following questions:
*Which cell has a stronger outer coveringa plant cell or an animal cell?
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How are cells organized?
Cells working together at the same job, or
function form a tissue. A group of tissues
that work together to perform a special
function form an organ. Organs working
together form an organ system.
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Answer the following questions:
*How do organs compare to organ systems?
*How are complex organisms organized?
Created by I. Cavalli