Proteins!

Which of the following are true of the secondary structure of proteins? Select all that apply!

• One formation is the beta helix

• One formation is the alpha helix

• They are stabilized by hydrogen bonds

• One formation is the beta-pleated sheet

• They are stabilized by peptide bonds

Which of the following are a component of amino acids? Select all that apply!

• Central calcium atom

• Carboxyl group

• Phosphate group

• Amino group

• Central carbon atom

What is the monomer of a protein?

• Amino acid

• Phospholipid

• Nucleotide

• Simple sugars

Describe the side-chain of this amino acid.

• Non-polar and hydrophobic

• Polar and uncharged

• Polar and charged (basic)

• Polar and charged (acidic)

Describe the side-chain of this amino acid.

• Non-polar and hydrophobic

• Polar and uncharged

• Polar and charged (basic)

• Polar and charged (acidic)

A ___________ is a covalent bond that forms between two ___________ amino acids.

• Peptide ; cysteine

• Hydrophobic effect ; nonpolar

• Hydrophilic effect ; polar

• Disulfide bridge; cysteine

• Disulfide bridge ; serine

Proteins are formed via ________ reactions, in which water is a _______.

• dehydration; reactant

• dehydration; product

• hydrolysis; reactant

• hydrolysis; product

Which of the following are true of R-groups, or sidechains, on amino acids? Select all that apply.

• They give amino acids their identity

• They may be charged or uncharged

• They may be hydrophobic or hydrophilic

• They are identical across all amino acids

• They form peptide bonds with other R-groups

Which interaction forms between nonpolar R-groups?

• Hydrogen bonds

• Peptide bonds

• Disulfide bridges

• Hydrophobic effects

• Ionic bonds

To build a polypeptide, amino acids form __________ bonds, which are _________.

• Hydrogen ; weak

• Hydrogen ; strong

• Peptide ; covalent

• Peptide ; ionic

• Ionic ; strong