Question

general concepts: match reagents with molecules detected
match each reagent with the type of macromolecule that it can be used to detect
1 biuret
2 iodine
3 benedicts
match each of the options above to the items below.
simple sugars.
protein.
starch.

Explanation:

Biuret reagent is used to detect proteins as it reacts with peptide bonds. Iodine solution is used to detect starch as it forms a blue - black complex with it. Benedict's reagent is used to detect simple sugars (reducing sugars) as it reacts with the aldehyde or ketone groups in them.

Answer:

simple sugars: 3. Benedict's
protein: 1. biuret
starch: 2. iodine