Key Area 1.3: Essay Questions

Question 1

Give an account of gene expression under the following headings:

a) - Transcription of DNA
b) - Translation of mature mRNA

Answer 1

a) - DNA unwinds and unzips
- RNA polymerase adds complementary RNA nucleotides
- to make a primary transcript
- introns are removed
- exons spliced to make mRNA
b) - mRNA goes to ribosome
- tRNA carries specific amino acids
- anti codons on tRNA align with codons on mRNA
- amino acids aligned in correct sequence
- amino acids linked by peptide bonds