Page 63 - Science Course 1 (Book 1)

The Cell Mo3-L1a: What are Cells?
Lesson 1

Let’s Begin

What are cells?
In this topic, you will learn the following All living things have cells, the basic unit of
lessons: an organism.

Mo. 3 - L1a What are Cells? Microscopes are used to view details of small
Mo. 3 - L1b Parts of a Cell objects or to view things that are too small to be
seen by the unaided eye.

Mo3-L1a What are Cells?

KEY CONCEPTS:
1. What are cells made of?

Vocabulary A-Z Cells are made of four types of macromolecules—
nucleic acids, lipids, proteins, and carbohydrates.
Let us learn some vocabulary
Cells are surrounded by a cell membrane which
keeps substances inside the cell and helps protect
the cell by keeping harmful substances from
Prokaryotic cells entering.

a cell that does not have a nucleus or other
membranebound organelles. Carbohydrates Lipids

Include Include

Polysaccharides Triglycerides

Contain

Disaccharides
Eukaryotic cells Contain
a cell that has a nucleus and other membrane-bound
organelles Fatty Acid
Composed of two

Monosaccharides

and

Glycerol

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