unit 2 7th grade

The cell is considered the basic unit of life. The Cell Theory was developed over time using contributions of several scientists working in different fields. Which of the following is NOT part of the Cell Theory?

• All cells contain a nucleus.

• The cell is the basic unit of life.

• All organisms are composed of cells.

• All cells come from preexisting cells.

The cell theory took hundreds of years to develop. The scientists over the years added their discoveries to the theory when they were able to scientifically prove their ideas. What aided in the development of the discoveries over the years?

• The organisms were able to grow larger after several decades, which allowed the scientists to see them clearer.

• The continued development of the microscope helped the scientists to see smaller organisms and their cellular structures.

• The scientists were able to think for themselves as time went on.

• The development of eyeglasses that were used helped scientists to look deeper into cell structures.

All living things are composed of cells.

• True

• False

Tags

NGSS.MS-LS1-1

What is diffusion?

• when molecules move 
• when molecules move from a high concentration to a low.
• no movement 
• molecules move everywhere

The picture below is an example of _________________.

• osmosis
• isotonic
• diffusion
• active transport

Osmosis is the movement of _____ across a membrane.

• food
• energy
• oxygen
• water

When both inside and outside of a cell have the same amount of water it is said that the cell has reached a state of

• Osmosis
• Diffusion
• Equilibrium

During osmosis

• water moves from high to low concentration
• large or oddly shaped molecules move across a cell membrane
• water moves when energy is used
• proteins are built

A person would never have pure water put into their veins in a hospital because their cells would...

• Shrink/Dehydrate
• Expand

Tags

NGSS.HS-LS1-3

What is DIFFUSION?

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