L65- amino acids, peptides, proteins

Question 1

what is a protein?

Answer 1

it is a polymer composed of amino acids, which are linked together by peptide bonds.

Question 2

how many different proteins are there?

Answer 2

20,000

Question 3

what are the different function of proteins?

Answer 3

• catalyst
• structure of cells and organisms
• storage and transport
• regulation of information flow
• transmission of nerve impulses

Question 4

what happens to amino acids at physiological pH?

Answer 4

They become twitter ions

Question 5

what are the different classes for amino acid R groups?

Answer 5

• non polar neutral
• polar neutral
• polar acidic
• polar basic

Question 6

what does non-polar neural groups mean?

Answer 6

amino acids have hydrophobic R groups.

Question 7

what does polar neutral groups mean?

Answer 7

amino acids have hydrophilic but neutral R groups

Question 8

what does polar acidic groups mean?

Answer 8

amino acids have hydrophilic but neutral R groups.

Question 9

what does polar acidic groups mean?

Answer 9

amino acids have hydrophilic acid R groups, I.e. the R group contains a COOH.

Question 10

what does polar basic groups mean?

Answer 10

amino acids have R groups that contain a basic nitrogen group.

Question 11

what are the different types of bonds that are used in the tertiary structure of a protein?

Answer 11

• disulfide
• hydrogen
• hydrophobic
• electrostatic

Question 12

what shape does a B-Sheet form?

Answer 12

zig zag

Question 13

what are the 5 types of intermolecular interactions?

Answer 13

1. Electrostatic/ionic bonds
2. Hydrogen bonds
3. Vander Waals interactions
4. Hydrophobic
5. Pi-pistacking

Question 14

what is the strongest intermolecular interaction?

Answer 14

electrostatic/ionic bonds