DNA has a triplet code 0.2 Explain how the Learning activities: Past exam which is universal, weeks DNA base material: remind students that there are and sequence is able to 20 amino acids and only 4 BIOL2 June 12 Q5b degenerate. Rich questions: code for the primary bases. Ask how many bases BIOL2 June 2011 structure of a – Much of eukaryotic DNA What is by the would have to code for an Q3a polypeptide. does not code for terms: amino acid to give sufficient Explain the terms polypeptides. are BIOL2 Jan 2010 Q3 degenerate? combinations – degenerate, non-coding regions of teacher explanation of the universal and multiple base repeats triplet code and the fact that between genes. There universal? there is degeneracy (as well Explain why much are also introns within as the fact it is universal and of eukaryotic DNA genes which separate A polypeptide is non-overlapping) can be considered coding sequences made of 24 amino ask the rich question: how as non-coding. (exons). acids. What is the many bases code for a Explain what is minimum number of polypeptide of 24 amino acids meant by an intron bases that the gene explain why the answer in and an exon. coding for it must fact be more than 72 as there have had? are introns in the gene. Introduce the idea of introns and also non-coding regions between genes exam questions. Skills developed by learning activities: MS 0.3 students – calculate the percentage of human DNA which does code for polypeptides, when
DNA has a triplet code which is universal, and degenerate. Much of eukaryotic DNA does not code for polypeptides. are non-coding regions of multiple base repeats between genes. There are also introns within genes which separate coding sequences (exons). 0.2 weeks Explain how the DNA base sequence is able to code for the primary structure of a polypeptide. Explain the terms degenerate, universal and Explain why much of eukaryotic DNA can be considered as non-coding. Explain what is meant by an intron and an exon. Learning activities: remind students that there are 20 amino acids and only 4 bases. Ask how many bases would have to code for an amino acid to give sufficient combinations teacher explanation of the triplet code and the fact that there is degeneracy (as well as the fact it is universal and non-overlapping) ask the rich question: how many bases code for a polypeptide of 24 amino acids explain why the answer in fact be more than 72 as there are introns in the gene. Introduce the idea of introns and also non-coding regions between genes exam questions. Skills developed by learning activities: MS 0.3 – students calculate the percentage of human DNA which does code for polypeptides, when Past exam material: BIOL2 June 12 Q5b BIOL2 June 2011 – Q3a BIOL2 Jan 2010 – Q3 Rich questions: What is by the terms: degenerate? universal? A polypeptide is made of 24 amino acids. What is the minimum number of bases that the gene coding for it must have had?
AQA-7401-SOW.DOCX