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.
Didn't know it?
click below
Knew it?
click below
Don't know
Remaining cards (0)
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


active transport the process by which cells use energy to transport molecules through the cell membrane from areas of low concentration to areas of high concentration
amino acids any one of several building blocks of protein
cell the basic unit of structure and function that makes up all organisms
cell membrane the thin boundary between the cell and its environment
cell respiration the process in which nutrients are broken apart, releasing the chemical energy stored in them
chloroplast the green organelle that contains chlorophyll; where photosynthesis takes place
circulation the flow of materials within a cell as well as between parts of a multicellular organism
cytoplasm the jellylike substance that is between the cell membrane and the nucleus and that contains specialized structures
diffusion the movement of molecules from areas of high concentration to areas of low concentration
digestion the process that breaks down large food molecules into simpler molecules that the organism can use
enzymes proteins that speed up the rate of chemical reactions in living things
excretion the removal of all the wastes produced by the cells of the body
homeostasis the ability of an organism to maintain a stable internal environment even when the external environment changes
hormone a chemical produced in the endocrine glands
immunity the body's ability to destroy pathogens before they cause disease
inorganic a type of molecule that does not contain both carbon and hydrogen but can contain any other combination of elements
metabolism all the chemical reactions that occur within the cells of an organism
mitochondria pod-shaped organelles that contain enzymes used to extract energy from nutrients
nucleus a large structure within a cell that controls the cell's metabolism and stores genetic information, including chromosomes and DNA
organ a body structure made of different kinds of tissues combined to perform a specific function
organ system several organs that work together to perform a major function in the body
organelle a structure within the cell that carries out a specific function
organic term used to describe molecules that contain both hydrogen and carbon
receptor molecule certain protein molecules in the cell membrane that can receive chemical messages from other cells
reproduction the process by which organisms produce new organisms of the same type
respiration the process by which the chemical bond energy stored in nutrients is released for use in cells
ribosome one of the tiny structures in the cell that is the site of protein production
simple sugars the result of the digestion of starches. Example: glucose
synthesis a life process that involves combining simple substances into more complex substances
tissue a group of specialized cells that perform a specific function
vacuole storage sacs within the cytoplasm of a cell that may contain either wastes or useful materials, such as water or food
Created by: WGZimm



Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards