past paper questions

Question 1

describe how a gene is a code for the production of a polypeptide. do not include information about transcription or translation in your answer. (3)

Answer 1

1- base/nucleotide sequence
2- triplets
3- order of amino acid sequence / primary structure

Question 2

describe how a phosphodiester bond is formed between 2 nucleotides within a DNA molecule. (2)

Answer 2

1- condensation reaction
2- between phosphate & deoxyribose sugar
3- catalysed by DNA polymerase

Question 3

show 3 differences between DNA in the nucleus of a plant cell & DNA in a prokaryotic cell. (3)

Answer 3

1- histones // no histones
2- linear // circular
3- no plasmids // plasmids
4- introns // no introns
5- longer // shorter