Grade 9 Macromolecules Review

Identify the functional group highlighted by the turquoise square.

• Hydroxyl

• Methyl

• Carboxyl

• Amine

Which of the molecules pictured are classified as a carbohydrate?

• B only.

• B and C only

• A, B and C

• A and D only

Biuret's test tests for the presence of peptide bonds in a solution. Which of the following results would be correct?

• a solution of amino acids; color change to purple

• A solution of whey protein; color change to purple

• A starch solution; color change to purple

• A solution of albumin (egg whites); no color change

All amino acids have which functional group (s)

• Amine only

• Amine and Hydroxyl

• Hydroxyl and Carboxyl

• Amine and Carboxyl

Which functional group(s) can be found in this structure pictured?

• hydroxyl only

• hydroxyl and carboxyl

• carboxyl only

• amine

Identify the functional group pictured in the turquoise box.

• amine

• hydroxyl

• carboxyl

• methyl

The molecule pictured is a _____ and the class of macromolecules that it belongs to is_______.

• triglyceride; carbohydrate

• tripeptide; protein

• triglyceride; lipid

• trisaccharide; carbohydrate

If I wanted to break the dimer pictured into smaller molecules, what type of reaction would have to occur?

• a dehydration synthesis reaction where a water molecule would be removed

• a dehydration synthesis reaction where a water molecule would be added

• a hydrolysis reaction where a water molecule would be removed

• a hydrolysis reaction where a water molecule would be added.

A glycosidic bond would form though a dehydration synthesis reaction between which two molecules?

• two amino acids

• two fatty acids

• two monosaccharides

• a fatty acid and a glycerol molecule

If I tested starch using Benedict's reagent, what result would I expect?

• There would be a slight color change to green, as there are a limited number of reducing carbons in starch.

• There would be significant color change to dark blue.

• There would be a significant color change to red.

• There would be no color change as there are no reducing carbons in starch.