1-3: Chemistry for Biology Flashcards
1
Q
Examples of molecules interacting with each other via non-covalent interactions
A
- Lipid molecules in a membrane.
- Protein interacting with another protein or smaller molecules.
- Enzyme – substrate interactions
- Proteins binding to DNA, and RNA.
- DNA- DNA, DNA-RNA etc.
- Cellular molecules and water
(the cytosol is 70% water)
2
Q
Non-Colavent Bonds
A
- These bonds are weak, but if there are lots of them, they hold molecules together.
- Molecules that have complementary shapes and chemistry (charge and bond polarity)will have lots of non-covalent interactions to keep them together longer
3
Q
Bond Terminology
A
4
Q
Electronegativity Order
A
5
Q
What is Electronegativity?
A
Electronegativity: tendency of a covalently bonded atom to pull the
electrons (e-) of the bond toward itself
6
Q
Non-Covalent Bond Types
A
7
Q
A
A. Permanent dipole- permanent dipole bond
(Polar Bond)
8
Q
A
B
9
Q
A
D.Induced dipole-induced
dipole bond
(Non-Polar Bond)
10
Q
A
11
Q
Polar Bonds in Biology
A
12
Q
Non-Polar Bonds in Biology
A
13
Q
Strongest to Weakest Bonds
A
14
Q
Hydrophilic
A
- Molecules (or molecular groups
that are part of that molecule)
interact with water. - Typically, polar, charged, make H
bonds and ionic interactions. - Polar molecules are usually
considered to have hydrophilic
properties
15
Q
Hydrophobic
A
- Molecules (or molecular groups that are part of a larger molecule) tend to have weak or little interactions with water.
- Typically forms nonpolar bonds.
