Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
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. Your email address is only used to allow you to reset your password. See 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.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
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

Cell-cell interactio

QuestionAnswer
Tight junctions seal cells together prevents passage of molecules between cells. found in epithelial cells(intestines, lungs)
Desmosomes connect the cytoskeletons of cells in tissues that experience intense mechanical stress
Gap junctions act as channels between cells allows direct communication between cells
Plasmodesmata gaps in cell walls no proteins involved
cell-cell signaling distant communication hormones are an example.
Four steps of cell-cell signaling 1. signal reception, 2. signal processing(Transduction), 3. signal response 4. Signal deactivation
1. signal reception the proteins change shape and activity after binding to a signal molecule its different for lipid-soluble vs. lipid-insoluble molecules
lipid soluble molecules can easily diffuse across cell membrane binds to receptors in the cytosol
lipid-insoluble molecules can't diffuse across cell membrane receptor is located on plasma membrane instead of direct response, it must trigger signal transduction
2. signal transduction conversion of one signal to another aka second messenger
what are some examples of signal transduction? second messengers phosphorylation cascade
Second messenger small molecule that elicits an intracellular response cAMP- activates kinases(can add phosphate groups) Ca2+- muscle contraction
Phosphorylation cascade each kinase phosphorylates a different kinase until a response is triggered
3. signal response 1. it can change gene expression( bind to DNA to either increase/decrease protein production) 2. change the activity of proteins in cells
4. signal deactivation final step of cell-cell signaling which deactivates the reaction
How do G proteins inactivate? they inactivate themselves after GTP hydrolysis(adds water to break bonds)
How do phosphorylation cascades inactivate? phosphatases remove phosphate groups from components
How do second messengers inactivate? Ca2+- the membrane pumps return to storage cAPM, the enzymes break down
Created by: clara22
Popular Biology sets

 

 



Voices

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:
Retries:
restart all cards