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Objectives

Lesson 2: Cells

How do lipids, carbohydrates, microscope in 1665 and observed
proteins, and nucleic acids come cells for the very first time.
together to form a living organism? Although the light microscope

By forming a cell. These organic opened our eyes to the existence
compounds are the raw materials of cells, they are not useful for
needed for life, and a cell is the looking at the tiniest components
smallest unit of an organism that is of cells. Many structures in the cell
still considered living. Cells are the are too small to see with a light
basic units that make up every microscope.
type of organism.
At the end of this unit, you will:
Some organisms, like bacteria,
· Understand what cells are,
consist of only one cell. Other
how cells form the basis for
organisms, like humans, consist of
all life
trillions of specialized cells working
· Understand the development
together. Even if organisms look
of the cell theory
very different from each other, if
· Know the function of the
you look close enough you’ll see
major cell organelles
that their cells have much in
· Understand how material
common.
enters and exits cells
Most cells are so tiny that you can’t · Understand the methods of

see them without the help of a cell division, and which types
microscope. The microscopes that of organisms use each
students typically use at school are

light microscopes. Robert Hooke
created a primitive light

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