Cell Theory Review

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

What year were cells first observed under the microscope?

• 1250

• 1665

• 1920

• 2023

Answer explanation

Robert Hooke observed cork cells under the microscope in 1665. He gave them the name "cellulae."

Tags

NGSS.MS-LS1-1

Match the following people to their cell discoveries:

• Anton Van Leuvenhoek

• Observed living cells in pond water

• Robert Hooke

• Discovered the nucleus in 1802

• Franz Bauer

• First person to observe cells (cork)

Tags

NGSS.MS-LS1-1

Why did Robert Hooke name the cork cells he saw "cellulae"?

• He thought they would be offended

• He thought they looked like little rooms

• He thought they came from a plant

• He thought they were not dead

Answer explanation

Robert Hooke observed dead, cork cells. All he could see were the cell walls.

They looked to him, like the walls of the rooms that monks lived in, called "cells."

There are two types of microscopes. ​ (a)   microscopes require thin specimens that are observed by shining a light through them. ​ (b)   microscopes create 3D images with higher magnification but can only be used to look at dead things.

• Light
• Scanning electron

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

• 
• bacteria

• 
• animal

• 
• plant

• 

Answer explanation

Protists are eukaryotes - they have a nucleus.

Tags

NGSS.MS-LS1-1

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

• spontaneous generation

• fairy dust

• magic

• eggs