Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how


Fill in the blanks

All organisms or living things, are made of ____________. cells
Every cell in every living thing comes from another cell that ___. splits
A single-celled organism that can carry on all its life processes is call __________. unicellular
Organisms made up of more than one cell are called _______. multicellular
Scientists estimate that there are more than __________ kinds of unicellular organisms. 1 billion
Both plant and animal cells perform life processes by using _______. organelles
All cells are surrounded by a _________that controls the materials that move in and out of a cell. cell membrane
The region between the cell membrane and the nucleus is filled with ______________. cytoplasm
The cell's control center is called the ______________. nucleus
The tiny power plants in the cell where food is broken down and energy is released are called mitochandria
A structure in a cell used for storage of water, food, and wast is called a ____________________. vacuole
Plant cells have a ____________, a rigid structure that serves as an outer covering. cell wall
A green structure called a _____________uses the energy from the sun to produce food for the plant. chloroplast
Cells are so small that a __________________is needed to view them. microscope
In the 1940's, ____________ microscopes were created that were 40,000 times more powerful than previous microscopes. electron
Created by: Sunlite705