Lecture 2 Flashcards
What properties do you need to associate with each amino acid?
- Polarity
- Charge (neg., pos., neutral)
What is electronegativity?
The ability for an atom to attract electrons towards itself.
How many amino acids have very non-polar side chains?
6
How many amino acids have moderately non-polar side chains?
5
How many amino acids have polar but uncharged side chains?
4
How many amino acids have positively charged (very polar) side chains?
3
How many amino acids have negatively charged (very polar) side chains?
2
What do amino acids with very non-polar side chains have?
They are dominated by hydrocarbons and consist only of C-C bonds and C-H bonds
What is a hydrocarbon?
Non-polar and hydrophobic.
What is Polarity a result of?
Atoms having different electronegativity or tendency to hold bonding electrons
What is the order of electronegativity of the atoms we will be dealing with?
O > N > S > C = H
What happens with elements that have similar electronegativity?
They share bonding electrons equally and are always non-polar (Example C - H bond)
What happens with elements that have different electronegativity?
The more EN atoms such as O or N get greater than 50% share and this leads to unbalanced charged and polar bonds
(Example C = O bond)
Why is Glycine considered moderately non-polar?
It has a single H atom as a side chain which is not enough to be VERY non polar
What is hydrophobicity related to?
The number of CH, CH2, or CH3 groups present.
