Exam 19: Amino Acids and Proteins

The dipeptide abbreviated as Gly-Lys is the same as the dipeptide abbreviated as Lys-Gly.

When two protein chains combine to form an active protein, the structural level is ________.

In sickle-cell anemia, the hemoglobin molecules

Methionine is an amino acid that contains

The peptide sequence Gly-Gly-Gly gives the primary structure of a tripeptide.

Lysine and glutamic acid form hydrophobic interactions.

Write the zwitterion of glycine.

Within hemoglobin, the heme functions as

Enkephalins, naturally produced opiates in the body, are found in

The isoelectric point for any amino acid is the pH at which the amino acid has a net charge of ________.

The fibrous protein responsible for the structure of hair and wool is

In the peptide Ala-Try-Gly-Phe, the N-terminal amino acid is

Hydrophobic interactions help to stabilize the ________ structure(s) of a protein.

Insulin is a transport protein.

A zwitterion of any amino acid has a net charge of ________.

Collagen can be classified as a ________ protein.

In the peptide Ser-Cys-Ala-Gly, the C-terminal end is

What kinds of interactions are NOT part of tertiary protein structure?

Which of the following is an example of a secondary protein structure?

Consider a mixture of the amino acids lysine (pI = 9.7), tyrosine (pI = 5.7), and glutamic acid (pI = 3.2) at a pH 5.7 that is subjected to an electric current. ________ will migrate towards the positive electrode(+).