Macromolecule structures from Figure 5.8, illustrating various biomolecules such as amino acids, carbohydrates, lipids, and nucleic acids.

It looks like you've uploaded a Macromolecule Worksheet (Chapter 5) that includes 15 molecules labeled from 1 to 15, and the instructions state that questions are based on these molecules. However, you haven't included the actual questions that go with this worksheet.

To help you effectively, I need the specific questions related to Figure 5.8 (the 15 molecules shown). Without them, I can’t solve or explain the problems.

But since you’ve shared the image with the 15 molecules, I can identify and classify each molecule, which will help you answer typical macromolecule-related questions (e.g., identifying monomers, functional groups, types of biomolecules, etc.).

---

🔬 Let's identify and analyze each molecule:

#### 1.
```
H–C–OH
| |
H–C–H
| |
H–C–H
| |
H–C–OH
```
- This is erythrose or a 4-carbon sugar.
- A monosaccharide (aldose).
- Likely erythrose, a tetrose.

✔ Type: Monosaccharide (aldose)

---

#### 2.
```
H₂N–C–COOH
|
CH₂
|
SH
```
- Contains amino group (NH₂), carboxyl group (COOH), and sulfhydryl group (SH).
- This is cysteine.

✔ Type: Amino acid

---

#### 3.
```
H₃C–C–CH₃
|
H
```
- This is propane (C₃H₈), but actually it's isobutane? Wait — structure shows:
- Central carbon bonded to two methyl groups and one hydrogen → 2-methylpropane?
- But written as: `H₃C–C–CH₃` with a single H on central C → propane?

Wait — let's redraw:
```
H₃C
|
H–C–H
|
CH₃
```
This is propane, but the way it's drawn suggests 2-propanol? No — no OH.

Actually, this is just propane: C₃H₈.

But wait — it’s likely propene? No, all bonds are single.

Wait — it's propane, but the formula is incorrect. It should be:
```
H₃C–CH₂–CH₃
```
But here it's:
```
H₃C–C–CH₃
|
H
```
So yes — propane, but this is not a biological monomer.

But perhaps it's meant to be an alkane, not a macromolecule building block.

✘ Probably not a monomer for macromolecules.

---

#### 4.
```
H–C–OH
| |
H–C–H
| |
H–C–OH
| |
H–C–OH
```
- Four carbons, all with OH groups — this is erythrose or threose?
- Actually, this is erythrose (aldotetrose).

Wait — compare to #1: both are similar. But #1 has 4 carbons, #4 also has 4 carbons.

Wait — #1 and #4 look identical? Let's check:

#1:
```
H–C–OH
| |
H–C–H
| |
H–C–H
| |
H–C–OH
```

#4:
```
H–C–OH
| |
H–C–H
| |
H–C–OH
| |
H–C–OH
```

Ah! Difference: in #1, the second carbon has H–C–H, third carbon also H–C–H, fourth has H–C–OH.

In #4: first: H–C–OH, second: H–C–H, third: H–C–OH, fourth: H–C–OH.

So #4 is erythrose, but stereochemistry may differ.

But actually, #4 is a sugar — likely erythrose or threose.

But more importantly — this is a monosaccharide.

✔ Type: Monosaccharide (aldose)

---

#### 5.
A long chain with:
- Phosphate group at top: `O–P–O⁻`, attached to `CH₂–N⁺(CH₃)₃`
- Then a glycerol backbone with two fatty acids (long hydrocarbon chains)
- And a third chain with a phosphate-linked head group

This is a phospholipid — specifically a phosphatidylcholine.

✔ Type: Phospholipid (component of cell membranes)

---

#### 6.
```
CH₂OH
|
HO–C–H
|
H–C–OH
|
H–C–OH
|
CH₂OH
```
- Six-membered ring with five OH groups and one CH₂OH — this is glucose in cyclic form.

✔ Type: Monosaccharide (glucose)

---

#### 7.
```
H₂N–C–COOH
|
CH₂
|
S
|
CH₃
```
- Amino group, carboxyl group, side chain: –CH₂–S–CH₃
- This is methionine

✔ Type: Amino acid

---

#### 8.
```
H–N–C–COOH
|
H
```
- This is glycine — simplest amino acid.

✔ Type: Amino acid

---

#### 9.
```
O=C–C–C–C–C–C–C–H
| | | | | | | |
H H H H H H H H
```
- Long hydrocarbon chain with a carbonyl at one end — this is a fatty acid.

✔ Type: Fatty acid (palmitic acid? C16?)

---

#### 10.
```
H–C–OH
| |
H–C–H
| |
H–C–OH
```
- Three carbons — this is glycerol

✔ Type: Glycerol (backbone of triglycerides)

---

#### 11.
```
O–P–OH
|
O⁻
```
- Phosphate ion — inorganic phosphate

✔ Type: Inorganic phosphate (used in phosphorylation, ATP, etc.)

---

#### 12.
```
HOCH₂–O
\
C–OH
/ \
H H
/ \
OH O
|
H
```
Wait — this is a six-membered ring with:
- Oxygen in ring
- OH groups on various carbons
- CH₂OH at one end

This is fructose in furanose form.

✔ Type: Monosaccharide (ketose)

---

#### 13.
```
H₂N–C–N–CH
| |
N NH
| |
C N
| |
N H
```
This is cytosine — a nitrogenous base.

✔ Type: Nitrogenous base (pyrimidine)

---

#### 14.
```
CH₃–O–O–O–O–O–CH₃
| | |
O O O
| | |
CH₃ CH₃ CH₃
```
Wait — this is a polymer of ethylene glycol — repeating units of –O–CH₂–CH₂–O– linked by ether bonds.

This is polyethylene glycol (PEG) — a synthetic polymer.

✔ Type: Synthetic polymer (not a natural macromolecule)

---

#### 15.
Two glucose rings connected by an oxygen bridge.

This is maltose — a disaccharide made of two glucose molecules.

✔ Type: Disaccharide

---

✔ Summary Table:

| # | Molecule Name | Type |
|---|------------------------|----------------------------|
| 1 | Erythrose (tetrose) | Monosaccharide (aldose) |
| 2 | Cysteine | Amino acid |
| 3 | Propane (alkane) | Hydrocarbon (not a monomer)|
| 4 | Threose/Erythrose | Monosaccharide (aldose) |
| 5 | Phosphatidylcholine | Phospholipid |
| 6 | Glucose | Monosaccharide |
| 7 | Methionine | Amino acid |
| 8 | Glycine | Amino acid |
| 9 | Palmitic acid (fatty acid) | Fatty acid |
|10 | Glycerol | Alcohol (triglyceride backbone) |
|11 | Phosphate ion | Inorganic phosphate |
|12 | Fructose (furanose) | Monosaccharide (ketose) |
|13 | Cytosine | Nitrogenous base |
|14 | Polyethylene glycol | Synthetic polymer |
|15 | Maltose | Disaccharide |

---

🧩 Common Questions You Might Be Asked:

Since you didn’t include the questions, here are likely ones and their answers:

---

#### ❓ 1. Which molecule is a phospholipid?
✔ Answer: 5

---

#### ❓ 2. Which molecule is a nucleotide component?
✔ Answer: 13 (cytosine) — a nitrogenous base; often paired with ribose and phosphate to make nucleotide.

But note: none show full nucleotide. So 13 is part of a nucleotide.

---

#### ❓ 3. Which molecule is a disaccharide?
✔ Answer: 15 (maltose)

---

#### ❓ 4. Which molecule is a fatty acid?
✔ Answer: 9

---

#### ❓ 5. Which molecule is a monosaccharide?
✔ Answer: 6 (glucose), 12 (fructose), 1 (erythrose), 4 (threose)

---

#### ❓ 6. Which molecule is a glycerol?
✔ Answer: 10

---

#### ❓ 7. Which molecule is an amino acid?
✔ Answer: 2 (cysteine), 7 (methionine), 8 (glycine)

---

#### ❓ 8. Which molecule is a polysaccharide?
✔ Answer: None — 14 is a synthetic polymer, but not a natural polysaccharide. 15 is a disaccharide, not a polysaccharide.

So none are polysaccharides.

---

#### ❓ 9. Which molecule is a nucleotide?
✔ Answer: None — only 13 is a base. No sugar or phosphate shown together.

---

#### ❓ 10. Which molecule is a steroid?
✔ Answer: None — steroids have four fused rings; none shown.

---

✔ Final Note:

If you can provide the actual questions from the worksheet (e.g., "Which molecule is a monosaccharide?", "Which molecule forms a peptide bond?", etc.), I can give precise answers with explanations.

But based on the structures, I’ve classified all 15 molecules and provided likely answers to common questions.

Please reply with the questions so I can solve them step-by-step!