1.1

Question 1

What are the four types of weak interactions for water?

Answer 1

1. Hydrogen bonding
2. Van der waals
3. Ionic
4. Hydrophobic interactions

Question 2

Why is water a good solvent for bio molecules

Answer 2

-polarity
-can make hydrogen bonds and ionic interactions can interact with diff bio molecules

Question 3

Why is the boiling point and melting point higher for water than for other solvents?

Answer 3

Water is highly cohesive due to many hydrogen bonds interacting

Question 4

Why is the bond angle of water important/significant

Answer 4

The bond angle lets the hydrogen bonds interact with 4 other molecules

Question 5

Why do dipoles occur in water?

Answer 5

The oxygen is more electronegative than hydrogen so the electrons are near oxygen which creates an unequal spread of electrons

Question 6

Which covalent bonds have stable dipoles and can form hydrogen bonds? O-H, C-H, C-C, N-H? Why?

Answer 6

-O-H and N-H because they are more electronegative than hydrogen so they can act as H donors/receivers
-C-H and C-C cannot because they are weakly polar and have similar electro negativity to hydrogen

Question 7

Which hydrogen bond is stronger, skewed or linear?

Answer 7

-linear since the charges are equally shared

Question 8

What is the difference between ionic bonds and ionic interactions?

Answer 8

-Ionic bonds transfer electrons while ionic interactions do not

Question 9

Name ways weak interactions are biologically important

Answer 9

-make lipid bilayers
-protein folding
-makes enzyme substrate complexes
-stability

Question 10

Are van der waals interactions stronger or weaker than hydrogen bonds, can non polar do van der waals

Answer 10

-weaker than hydrogen bonds
-non polar can

Question 11

Which amino acids are hydroxylic?

Answer 11

Serine and Threonine

Question 12

Which amino score contain sulfur?

Answer 12

Cysteine and Methonine