Amino Acids, Proteins & Enzymes

Amino acids are the building blocks of ____.

• carbohydrates
• nucleic acids
• proteins
• lipids

What determines an amino acid's chemical properties?

• R group
• amino group
• alpha carbon
• carboxyl group

Nonpolar amino acids cluster in the interior of proteins, away from water.

• True
• False

Which amino acids contain sulfur?

• Lysine, arginine
• Cysteine, methionine
• Glycine, alanine
• Serine, threonine

Cysteine thiol groups can form ____ bonds.

• peptide
• ionic
• hydrogen
• disulfide

Which amino acid serves as the start codon amino acid?

• Proline
• Cysteine
• Methionine
• Glycine

Proline's side chain loops back to bond with the nitrogen, creating a rigid ring.

• True
• False

At physiological pH, amino acids exist as ____.

• anions
• cations
• zwitterions
• radicals

The pH at which a molecule has no net charge is its:

• Isoelectric point
• Equilibrium point
• Vmax
• Km

All standard amino acids including glycine are chiral.

• True
• False

Amino acids join through ____ bonds via dehydration.

• disulfide
• ionic
• hydrogen
• peptide

What is released when a peptide bond forms?

• Carbon dioxide
• Water
• ATP
• Ammonia

Which level is the linear sequence of amino acids?

• Secondary
• Tertiary
• Quaternary
• Primary

Secondary structure is stabilized by hydrogen bonds between backbone atoms.

• True
• False

How many subunits does hemoglobin have?

• Two
• Six
• Three
• Four