Solved Macromolecule Worksheet (Ch. 5) The following | Chegg.com - Free Printable

It looks like you've uploaded a worksheet titled "Macromolecule Worksheet (Ch. 5)" with 15 molecules labeled 1 through 15, and the instructions state that questions are based on these molecules. However, you haven't included the actual questions that go along with this image.

To help you properly, I need to know:

🔍 What specific questions are being asked?

Common types of questions for such a worksheet include:
- Identifying the type of molecule (e.g., monosaccharide, amino acid, fatty acid, nucleotide, etc.)
- Determining which molecules are building blocks of macromolecules
- Identifying functional groups
- Matching molecules to their roles in biological systems
- Identifying polymers vs. monomers
- Recognizing dehydration synthesis or hydrolysis products

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🧪 Let's Analyze the Molecules First

Here’s a quick identification of each molecule based on structure:

| # | Structure Description | Likely Identity |
|---|------------------------|-----------------|
| 1 | Linear chain with multiple OH groups | Glycerol (a triol) |
| 2 | Amino group, carboxyl group, SH group | Cysteine (amino acid) |
| 3 | Two carbon atoms with methyl groups | Ethane or isobutylene? Wait — actually: Propane? No — wait: This is propene? But it's likely an alkane — but more likely not a biological molecule. Actually, this looks like ethane, but two carbons with H and CH₃ — no, it's propane? Wait: H₃C–CH=CH₂? No — it's H₃C–C–CH₃ with two H's → Propane? But not biologically relevant. Maybe an alkane — perhaps butane? Wait: It's CH₃–CH₂–CH₃? No — it's shown as H₃C–C–CH₃, with two H's on central C → that’s propane. But probably not a key biomolecule. Likely not a monomer. |
| 4 | Sugar with 4 carbons, all OH groups | Erythrose or erythrulose? But this looks like erythrose (a tetrose). |
| 5 | Phosphate group attached to sugar + nitrogen base? Wait — this has a long chain of CH₂, then phosphate, then CH₂–N(CH₃)₃ → this looks like choline with phosphate → phosphatidylcholine head group? Yes — this is the polar head of a phospholipid. |
| 6 | Ring structure with OH groups, CH₂OH at one end → Glucose (in ring form)? Wait — it has 5 carbons? No — look: it's a pentose (5-carbon ring), so ribose or deoxyribose? But it has CH₂OH and OH on every carbon → Ribose? Yes — ribose (a pentose sugar). |
| 7 | Amino group, carboxyl group, side chain S — same as #2? No — this one has SCH₃ instead of SH → Methionine (amino acid) |
| 8 | Amino group, carboxyl group, side chain H → Glycine (simplest amino acid) |
| 9 | Long chain of CH₂ groups with COOH at one end → Fatty acid (long-chain saturated fatty acid) |
| 10 | 3-carbon sugar with OH groups → Glyceraldehyde (a triose) |
| 11 | Phosphate group (PO₄²⁻) → Inorganic phosphate |
| 12 | Ring structure with 5 carbons, OH groups, and CH₂OH — similar to #6 → Deoxyribose? But it has OH on C2? Wait — no: if it has OH on C2, it's ribose. If it lacks OH on C2, it's deoxyribose. Here: it has OH on C2 → Ribose? But #6 is also ribose? Wait — maybe both are different? Let's check: #6 has CH₂OH and OH on C1, C2, C3, C4, C5 — yes, ribose. #12: same — but wait, it shows a five-membered ring with OH on C1, C2, C3, C4, and CH₂OH on C5 — that’s ribose again? Or could it be deoxyribose? No — deoxyribose has H instead of OH on C2. So unless marked, this is ribose. But #6 is also ribose? Possibly duplicate? Or maybe #6 is arabinose? Hard to tell without stereochemistry. But likely both are ribose? Wait — let's double-check: #6 has HO–CH–CH–CH–CH–CH₂OH in ring — yes, standard ribose. #12 is identical? Then maybe typo or duplication. But likely #6 = ribose, #12 = deoxyribose? But #12 has OH on C2 — so not deoxyribose. So both are ribose? Possible. |
| 13 | Nitrogen-containing ring with NH₂ — Cytosine (nitrogenous base) |
| 14 | Chain of three ethylene glycol units linked by oxygen — Glycerol triether? Or polyethylene glycol? But more likely a triglyceride backbone? No — this is glycerol with ester linkages? No — it's just ether bonds. So it's a polyether — not biologically significant. But wait — it's O–CH₂–CH₂–O–CH₂–CH₂–O–CH₂–CH₃ — so triethylene glycol? Not a typical biomolecule. But possibly a model for polyester or polymer. |
| 15 | Two glucose rings linked by O — Maltose (disaccharide) |

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✔ Summary of Key Molecules:

| Number | Molecule Type | Name |
|--------|---------------|------|
| 1 | Alcohol | Glycerol |
| 2 | Amino acid | Cysteine |
| 3 | Hydrocarbon | Propane (not biologically relevant) |
| 4 | Sugar | Erythrose (tetrose) |
| 5 | Phospholipid head | Phosphatidylcholine head group |
| 6 | Sugar | Ribose (pentose) |
| 7 | Amino acid | Methionine |
| 8 | Amino acid | Glycine |
| 9 | Fatty acid | Long-chain saturated fatty acid |
| 10 | Sugar | Glyceraldehyde (triose) |
| 11 | Inorganic ion | Phosphate (PO₄³⁻) |
| 12 | Sugar | Ribose or Arabinose? Likely ribose |
| 13 | Nitrogenous base | Cytosine |
| 14 | Polymer-like ether | Polyethylene glycol (not typical biomolecule) |
| 15 | Disaccharide | Maltose (glucose-glucose) |

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🎯 Common Questions You Might Be Asked:

1. Which molecule is a monosaccharide?
→ #4, #6, #10, #12 (all sugars)

2. Which molecule is an amino acid?
→ #2 (Cysteine), #7 (Methionine), #8 (Glycine)

3. Which molecule is a nucleotide component?
→ #6 (ribose), #13 (cytosine), #5 (phosphate + choline → part of phospholipid, not nucleotide), #11 (phosphate)

4. Which molecule is a fatty acid?
→ #9

5. Which molecule is a disaccharide?
→ #15 (maltose)

6. Which molecule is a phospholipid head group?
→ #5 (phosphatidylcholine head)

7. Which molecule is a building block of proteins?
→ #2, #7, #8 (amino acids)

8. Which molecule is a building block of DNA/RNA?
→ #6 (ribose), #13 (cytosine), #11 (phosphate)

9. Which molecule is a triglyceride?
→ None directly — but #1 (glycerol) and #9 (fatty acid) combine to make one.

10. Which molecule is a polymer?
→ #15 (maltose is a disaccharide, small polymer), #14 (polyether chain)

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❓ Please Provide the Actual Questions!

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