Protein Synthesis Practice Worksheet Diagram

Let's solve this Protein Synthesis Practice worksheet step by step.

The diagram illustrates the process of protein synthesis, which includes transcription (in the nucleus) and translation (in the cytoplasm). We need to identify each labeled part in the diagram and label them correctly.

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Step 1: Understand the Diagram

We see:
- A nucleus with a nuclear membrane.
- DNA inside the nucleus.
- RNA being synthesized from DNA (transcription).
- mRNA leaving the nucleus.
- Ribosomes on the rough endoplasmic reticulum (RER) translating mRNA into a protein.
- tRNA bringing amino acids to the ribosome.
- The growing polypeptide chain.

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Step 2: Identify Each Numbered Part

Let’s go through each number:

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#### 1.
This is DNA inside the nucleus. It has the sequence A-T-C-G, which matches the base pairing rules.
✔ Answer: DNA

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#### 2.
This is a messenger RNA (mRNA) strand being synthesized from DNA. It shows U-A-G-C, which corresponds to the complementary RNA strand (uracil replaces thymine).
✔ Answer: mRNA

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#### 3.
This is the nuclear membrane that separates the nucleus from the cytoplasm.
✔ Answer: Nuclear Membrane

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#### 4.
This is a ribosome (a small structure made of rRNA and proteins), shown as two subunits coming together. It's where translation occurs.
✔ Answer: Ribosome

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#### 5.
This is a tRNA molecule carrying an amino acid. It has an anticodon (C-G-U) that pairs with the codon on mRNA.
✔ Answer: tRNA

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#### 6.
This is the amino acid attached to the tRNA. It's the building block of the protein.
✔ Answer: Amino Acid

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#### 7.
This is the codon on the mRNA, which is read by the tRNA. Here it's G-C-C, which codes for an amino acid.
✔ Answer: Codon

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#### 8.
This is the anticodon on the tRNA, which pairs with the mRNA codon. It's C-G-U here.
✔ Answer: Anticodon

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#### 9.
This is the polypeptide chain (growing protein) being formed during translation. It's the chain of amino acids linked together.
✔ Answer: Polypeptide Chain

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#### 10.
This is the endoplasmic reticulum (ER), specifically the rough ER because it has ribosomes attached. This is where proteins are synthesized for secretion or insertion into membranes.
✔ Answer: Rough Endoplasmic Reticulum (RER)

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Final Answers:

| Number | Answer |
|--------|----------------------------------|
| 1 | DNA |
| 2 | mRNA |
| 3 | Nuclear Membrane |
| 4 | Ribosome |
| 5 | tRNA |
| 6 | Amino Acid |
| 7 | Codon |
| 8 | Anticodon |
| 9 | Polypeptide Chain |
| 10 | Rough Endoplasmic Reticulum (RER)|

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Summary of the Process:

1. Transcription: DNA → mRNA in the nucleus.
2. mRNA exits through nuclear pores.
3. Translation: mRNA binds to ribosome on RER.
4. tRNA brings amino acids matching the codons.
5. Peptide bonds form between amino acids, creating a polypeptide chain.

This is a classic representation of eukaryotic protein synthesis.

Let me know if you'd like a labeled version or explanation of any step!