Standard 14: Cell Theory

According to cell theory, all ​ (a)   are made of ​cells, cells are the smallest units of life, and all cells come from other ​ (b)   .

• living things
• cells

Tags

NGSS.MS-LS1-1

Select all that apply: Which of the following types of cells have a nucleus?

• bacteria

• plants

• prokaryotes

• eukaryotes

Answer explanation

Eukaryotes have a nucleus. Plants, animals, fungi and protists are all eukaryotes.

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

Circle the prokaryotes in this picture:

Answer explanation

The prokaryotes are simpler, with the DNA in the cytoplasm.

The Eukaryotes have the DNA in the nucleus and they have other organelles.

Tags

NGSS.MS-LS1-1

Where do cells come from?

• other cells

• the air

• water

• outer space

Answer explanation

According to cell theory, all cells come from other cells.

Scientists still don't have an answer for where the first cell came from!

Tags

NGSS.MS-LS1-1

Match the following pictures to the types of cells:

• protist

• 
• plant

• 
• bacteria

• 
• animal

• 

Answer explanation

Protists are eukaryotes - they have a nucleus.

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

Before Cell Theory was fully developed, where did many people think that living things came from?

• spontaneous generation

• fairy dust

• magic

• eggs

Which invention from the 17th century allowed for the development of modern cell theory?

• x-rays
• computers
• the light microscope
• the scanning electron microscope

Cell theory was first proposed in 1838. Evidence obtained through additional scientific investigations resulted in the current cell theory. Which statement describes a component of the original cell theory that was removed because of the new scientific knowledge?

•  All living things are made of cells.
• All cells come from other preexisting cells.
• Cells form through spontaneous generation.
•  Cells are the basic structural and functional units of life.
  

 Cells are the basic structural and functional units of life.

• Plants have cells but animals do not.
•  They are both made of one or more cells. 
• They both come from the same kind of cell.
• They both come from a non-living organism.

Tags

NGSS.MS-LS1-1

A plant and an animal are both living things. According to the Cell Theory, what can you conclude about these two very different organisms?

• Plants have cells but animals do not.
• They are both made of one or more cells. 
• They both come from the same kind of cell.
• They both come from a non-living organism.

Tags

NGSS.MS-LS1-1