BitWithBite
MDCAT Worksheet
🧬 Biological Molecules
SCORE___ / 20
NameClassDate
After this worksheet you can
Classify carbohydratesDescribe protein structure levelsDistinguish saturated/unsaturated lipidsCompare DNA and RNA📚 Quick Recap
🎯 What you'll practice: Carbohydrate/protein/lipid classification, the four biochemical tests, and the key DNA vs RNA differences.
🧠 Section A · Concept Check ● BEGINNER 4 × 1 = 4
1Which is a monosaccharide?
2Biuret test turns proteins:
3Unsaturated lipids at room temperature are:
4RNA's sugar is:
🧮 Section B · Problem Solving ● INTERMEDIATE 2 + 3×3 = 11
5Proteins are built from different amino acids.
6The Iodine test detects .
7A triglyceride is made of glycerol plus how many fatty acids?
8Name the bonds that hold together a protein's secondary (α-helix/β-sheet) structure.
9List two bases found in DNA but written differently in RNA (i.e. the base that changes).
🚀 Section C · Challenge ● CHALLENGE 5
10A food sample turns blue-black with iodine but shows no colour change with Benedict's. What macromolecule is present, and why does it not react with Benedict's reagent?
💭 Reflection — the most useful thing I learned:
A ___/4 B ___/11 C ___/5 Total ___/20
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✂ answer key — fold or cut before handing out
1-B 2-B 3-B 4-C | 5 = 20 6 = starch 7 = 3 8 = hydrogen bonds 9 = thymine (DNA) becomes uracil (RNA) | 10 = Starch is present — it is a non-reducing polysaccharide, so it gives no colour change with Benedict's (which only detects reducing sugars) but reacts with iodine to give the classic blue-black complex.