Give the two types of molecule from which a ribosome is made.

Describe the role of a ribosome in the production of a polypeptide. Do not include transcription in your answer.

Table 1 shows the base sequence of part of a pre-mRNA molecule from a eukaryotic cell.

Complete the table with the base sequence of the DNA strand from which this pre-mRNA was transcribed.

In a eukaryotic cell, the base sequence of the mRNA might be different from the sequence of the pre-mRNA.

Explain why.