Lab Amino Acids, Proteins, and Carbs

Question 1

A powerful oxidizing agent that reacts with amino acids to form a purple colored compound

Answer 1

Ninhydrin

Question 2

Positively reacts with Ninhydrin to produce a purple color

Answer 2

Glycine, Tryptophan and Tyrosine

Question 3

Compounds that contain hydroxy benzene Rgroup react with what to form red complexes

Answer 3

Millon’s Reagent

Question 4

Reacts positively with Millon’s Reagent

Answer 4

Tyrosine

Question 5

Compounds containing sulfur can be detected by

Answer 5

ppt that is black colored (Cystine)

Question 6

Compounds that contain the indole group give colored complexes when reacting with

Answer 6

Ehrlich’s reagent (Tryptophan turns magenta)

Question 7

Compounds containing two or more peptide bonds to give a violet colored complex when reacted with

Answer 7

Alkaline copper sulfate (Albumin dark purple)

Question 8

Two of the most abundant disaccharides found in the biosphere are

Answer 8

Sucrose and Lactose

Question 9

This test for carbs reacts to give a blue-green complex

Answer 9

Anthrone Test (Ribose or Fructose)

Question 10

Pentoses yield a blue green color when they react with

Answer 10

Orcinol (Ribose)

Question 11

Ketoses condense and form an orange to red complex when heated in acid and reacted with

Answer 11

Reorcinol (fructose)

Question 12

Starch give a blue color and glycogen (partially degraded starch) gives a blue-brown to black color when reacted with

Answer 12

Iodine (Starch and Glycogen)