Preview of a biology worksheet on proteins and amino acids.

It looks like you've uploaded a worksheet titled "Proteins: Amino Acids" that covers topics related to amino acids, peptide bond formation, and protein functions. However, the image contains a "PREVIEW" watermark, which means the actual content is not fully visible or accessible.

To help you effectively, I need to see the specific question or task from the worksheet. Since the text and images are obscured, I can't directly solve the problem unless you provide:

1. The exact question(s) or task(s) from the worksheet.
2. Any diagrams or structures (e.g., amino acid structures, peptide bond formation).
3. What you're being asked to do — for example:
- Draw the structure of a dipeptide?
- Identify functional groups in amino acids?
- Explain how proteins function?

Common Tasks on This Type of Worksheet

Here are typical problems found in such worksheets, along with explanations:

---

#### 1. Forming a Dipeptide
You may be asked to:
- Show how two amino acids join via a condensation (dehydration synthesis) reaction.
- Draw the peptide bond formed between the carboxyl group (–COOH) of one amino acid and the amino group (–NH₂) of another.
- Remove a water molecule (H₂O) during this process.

Example:
If glycine and alanine form a dipeptide:
- Glycine: H₂N–CH₂–COOH
- Alanine: H₂N–CH(CH₃)–COOH
After bonding:
H₂N–CH₂–CO–NH–CH(CH₃)–COOH + H₂O

---

#### 2. Amino Acid Structure
You might be asked to:
- Label parts of an amino acid: amino group, carboxyl group, side chain (R group), and central carbon.
- Draw the general structure:
H
|
H₂N–C–COOH
|
R

---

#### 3. Glutamic Acid Structure
You could be asked to draw the structure of glutamic acid, which has a –CH₂–CH₂–COOH side chain (acidic).

Structure:
```
H
|
H₂N–C–COOH
|
CH₂
|
CH₂
|
COOH
```

---

#### 4. Functions of Proteins
Common answers include:
- Enzymes (catalyze reactions)
- Structural support (collagen, keratin)
- Transport (hemoglobin)
- Defense (antibodies)
- Hormones (insulin)
- Movement (actin, myosin)

---

How to Proceed

Please provide:
- The exact question you're stuck on.
- Any diagram or structure you need help interpreting.
- Or type out what's written in the boxes.

Once I have that, I’ll give you a clear, step-by-step solution with explanations!