Chem 102 Exam 3

What makes up proteins?

• Amino Acids

• Monosaccharides

• Enzymes

• Phosphate Groups

If the OH group on the chiral carbon furthest from the carbonyl is on the right it is an R-isomer

• True

• False

Which amino acid is polar?

• Cysteine

• Isoleucine

• Serine

• Methionine

How many amino acids are in this peptide?

• 1

• 2

• 3

• 4

What is a zwitterion?

• a weird food

• the state of an amino acid at neutral pH

• a carbohydrate that dissolved in water

• any amino acid that has a net charge

What is the net charge of valine in an acidic pH (2)?

HINT: draw out valine and all its charges/lone pairs

• Neutral

• +1

• +2

• -1

What is the net charge of Valine in a basic pH?

• -2

• +1

• +2

• -1

Name this peptide

• ALA-LEU-ILE

• GLY-VAL-MET

• ALA-VAL-LEU

• GLY-LEU-MET

What type of inhibitor binds to the active site?

• Irreversable

• Competitive

• Allosteric

• Covalent

What level of protein structure is this?

• primary

• secondary

• tertiary

• quaternary