BRAINCAKETranscription
Protein synthesis consists of two stages.
In the nucleus the DNA of a single gene is copied as a complementary mRNA strand. This leaves the nucleus through nuclear pores and associates with ribosomes in the cytoplasm.
tRNA molecules attached to amino acids bind temporarily to the mRNA in the order determined by the base sequence on the mRNA.
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Key terms in this lesson
- peptide bond
- The covalent bond formed between two amino acids by a condensation reaction.
- codon
- A sequence of three bases on mRNA that codes for a specific amino acid.
- gene
- A length of DNA that codes for a specific polypeptide.
More in Biological Molecules
- Continuous and Dis-continuous Replication
- Replication Errors
- The Genetic Code
- Protein Synthesis
- The role of tRNA, mRNA and rRNA
- Splicing
- Translation
- ATP
All 63 lessons in Biological Molecules · All OCR AS-level Biology topics