science chapter 1 – lesson 1 created by i. cavalli
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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.
Cavalli
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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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