Intro to cells

In this lesson…

You will be able to explain
the components of the
scientific theory of cells.

​Parts of the cell theory

​1. All organisms are made of cells (plants, animals, fungus...)

​2. All cells come from preexisting cells.

​3. Cells are the basic structure of life.

​People to know...

​-Zaccharias Jensenn

​-Robert Hooke

-Matthias Schleiden

-Anton van Leeuwenhoek

​- Theodor Schwann

​-Rudolph Virchow

Multiple Choice

Rocks are not living because

• they never move
• they aren't needed for humans
• they are not made of cells
• they don't break down

Multiple Choice

What is a cell?

• A cell is the smallest unit of matter.

• A cell is the largest structure in an organism.

• A cell is the basic unit of structure and function in all living things.

• A cell is a structure that can only be found in plants.

Multiple Choice

How many cells are in the human body?

• About one million cells

• About one billion cells

• About one hundred billion cells

• About one trillion cells

Multiple Choice

"All animals are made of cells". This fact was discovered by...

• Matthias Schleiden
• Theodor Schwann
• Robert Hooke
• Rudolf Virchow

Multiple Choice

All plants are made of cells.  This was discovered by....

• Matthias Schleiden
• Rudolf Virchow
• Robert Hooke
• Aristotle

Multiple Choice

Robert Hooke, Anton van Leeuwenhoek, Theodor Schwann, Rudolf Virchow, and Matthias Schliden were all responsible for what theory?

• The Theory of Gravity
• The Theory of Relativity
• The Cell Theory
• The Theory of Continental Drift

Multiple Choice

All living things are made of one or more...

• electrons

• atoms

• molecules

• cells

Multiple Choice

All cells come from...

• existing cells

• matter

• spontaneous generation

• electrical impulses

Multiple Choice

In 1673, this person used an improved microscope to observe bacteria from teeth scraping and red blood cells.

• Leeuwenhoek

• Flemming

• Pasteur

• Schwann

Multiple Choice

Who first used the term "cell" to describe the empty "rooms" he saw in his microscope?

• Leeuwenhoek

• Virchow

• Pasteur

• Hooke

Multiple Choice

Which of the following is NOT one of the three parts of Cell Theory?

• All living things are made of cells.
• The cell is the smallest living thing that can perform all the functions of life.
• Cells are too small to see without a microscope.  
• All cells must come from pre-existing cells.

Multiple Choice

Why are cells so small?

• Smaller cells can move more easily within an organism.

• Cells need to be small so they can reproduce quickly.

• Smaller cells have a larger surface area relative to their volume, allowing for efficient exchange of materials.

• Cells are small to fit inside an organism’s tissues.

Multiple Choice

Which is not a part of cell theory?

• All organisms are made of cells
• All existing cells come from preexisting cells
• All matter is composed of living cells
• The cell is the most basic unit of life

Multiple Choice

According to the cell theory, where do new cells come from?

• New cells form from non-living matter.

• New cells come from pre-existing cells.

• New cells are spontaneously created by the organism.

• New cells are formed by a chemical reaction within the body.

Multiple Choice

According to cell theory, what is the basic unit of all life?

• the atom

• the heart

• the cell

• the sun

Characteristics of Cells

Cell theory lists three
basic characteristics of all
cells.