Amino acids and proteins

The general components of an amino acid are

• amino group

• carboxylic acid group

• alpha carbon

• R group side chain

• all of the above

The lead acetate relies on the coordination of copper ions with the lone pairs of nitrogens in the amino acids

• True

• False

Why do most proteins test positive using the lead acetate test?

• lead is a very dense heavy metal

• lead coordinates with the nitrogen lone pairs of amino acids

• cysteine is a super common amino acid contained in most proteins

Running the xanthoproteic test on this compound would yield what result?

• Alanine; yellow

• Phenylalanine; purple

• Tyrosine; purple

• Phenol; yellow

Electrophoresis is defined as

• the movement of electrons through pores

• the movement of charged or ionic particles under the influence of an electric field

• the movement of proteins under the influence of a field

• the movement of amino acids through an agarose gel

A protein is effectively deprotonated by a buffer leaving a net [blank] charge and a tendency to migrate toward the

• negative; anode

• positive; anode

• negative; cathode

• positive; cathode

Which is the major protein component in serum and displays the most prominent absorbance band in an electrophoretic separation of serum proteins?

• albumin

• alpha-1

• beta

• gamma

Why does an amino acid yield a negative biuret test result?

• it depends on the side group

• because there are no peptide bonds present

• because it's not a reducing sugar

• because it is a charged compound