Question

order the steps of protein synthesis.

dna is transcribed.
rna is modified into mrna.
amino acids are lined up in a sequence.
chemical bonds are formed and a protein is produced.
a ribosome binds to mrna.

Explanation:

Analyze the steps of protein synthesis

The question asks to order the steps of Protein Synthesis Pathway. Let's examine the five given events:

1. DNA is transcribed.
2. RNA is modified into mRNA.
3. Amino acids are lined up in a sequence.
4. Chemical bonds are formed and a protein is produced.
5. A ribosome binds to mRNA.

Sequence the transcription phase

Transcription occurs first in the nucleus, where DNA is used as a template to synthesize RNA.

• First step: "DNA is transcribed."
• Second step: The newly synthesized pre-RNA must be processed before leaving the nucleus: "RNA is modified into mRNA."

Sequence the translation phase

Once the mature mRNA enters the cytoplasm, translation begins.

• Third step: "A ribosome binds to mRNA."
• Fourth step: Transfer RNA (tRNA) molecules bring amino acids to the ribosome, matching codons to anticodons: "Amino acids are lined up in a sequence."
• Fifth step: Peptide bonds form between the amino acids to build the polypeptide chain: "Chemical bonds are formed and a protein is produced."

Answer:

1. DNA is transcribed.
2. RNA is modified into mRNA.
3. A ribosome binds to mRNA.
4. Amino acids are lined up in a sequence.
5. Chemical bonds are formed and a protein is produced.