Identifying biomolecules via specific reagent tests

Steps:

• Recall standard tests: iodine turns blue-black for starch; Benedict's gives red precipitate for glucose (reducing sugar); Biuret yields violet for protein.
• Analyze solution 1: positive iodine result indicates starch; negative Benedict's and Biuret confirm no glucose or protein.
• Analyze solution 2: positive Benedict's and Biuret indicate glucose and protein; negative iodine confirms no starch.
• Match results to option C's table, which shows this exact pattern for the two solutions.

Why C is correct:

• C displays the precise test outcomes aligning with starch in solution 1 (iodine positive) and glucose/protein in solution 2 (Benedict's and Biuret positive), per standard biochemical identification methods.

Why the others are wrong:

• A: Alternating positives mismatch specific test reactivities for starch vs. glucose/protein.
• B: All negatives fail to detect any biomolecules present.
• D: Incorrect result pattern does not correspond to expected positives for the molecules.

Final answer: C