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

Intro to AA and stru

Intro to Amino Acids

Non-polar, aliphatic R groups Glycine, Alanine, Proline, Valine, Leucine, Isoleucin, Methionine
Aromatic R groups Phenylalanine, Tyrosine, Tryptophan
Polar uncharged groups Serine, Threonine, cysteine, Asparagine, Glutamine
Positively charged R groups Arginine, Lysine, Histidine
Negatively charged R groups Glutamate, Aspartate
Name several factors disulfide bond formation depend on # of cysteine residues, proximity effects, reactivity of SH groups, Redox state of glutathione (GSH)
Ionic interactions Strength or force of interactions depend on the magnitude of the charge Q, the inverse of the square of the distance between charged groups and the inverse of the dielectric constant
What is the dielectric constant in a vacuum? Hexane? Water? Vacuum=1, Hexane=2 and water=80. Organic solvents have relatively low dielectric constants
What weakens the force of interaction? Ions in solution in the vicinity of the charged residues.
What is the isoelectric point (pI)? The pH value at which a protein is electrically neutral. If the pH is greater than the pI, the protein will be negatively charged.
Type I beta turn Contains a Pro residue in position 2. More common
Type II beta turn Contains a Gly in position 3