Proteins

Question 1

Peptide bond

Answer 1

Joins amino acids together between the alpha carboxyl group or one amino acid and the alpha amino group of a second.

Question 2

Primary structure

Answer 2

The main amino acid sequence that forms that base for the structures that build on the top of its polypeptide chain.

Question 3

Secondary structure

Answer 3

Regular arrangement of amino acids in localized regions of the polypeptide. H-bonding between backbone partial charges. There are two types: alpha helix and beta sheet.

Question 4

Tertiary structure

Answer 4

has a single polypeptide chain “backbone” with one or more protein secondary structures and the protein domains. Describes the overall folding of a single polypeptide chain as a result of interactions between the side chains of amino acids that lie in different region of the primary sequence.

Question 5

Quaternary structure

Answer 5

Associations between separate structures (polypeptide chains) in proteins composed of more than one polypeptide subunits.

Question 6

alpha-helix

Answer 6

Keratin (in hair skin and nails). Alpha helix is spiral shaped and are the only structures that can penetrate the membrane.

Question 7

Beta-sheet

Answer 7

Rigid structures at the core of proteins.Can be parallel or antiparallel. Formed between several polypeptide strand, which can be oriented in either the same or opposite directions.