2024 aqa as biology 7401/2
paper 2 with 150 questions and
correct detailed answers
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Compare and contrast the DNA in eukaryotic cells with the
DNA in prokaryotic cells -answer-Comparisons
1. Nucleotide structure is identical; 2. Nucleotides joined by
phosphodiester bond; OR Deoxyribose joined to phosphate (in
sugar, phosphate backbone); 3. DNA in mitochondria /
chloroplasts same / similar (structure) to DNA in prokaryotes
Contrasts
4. Eukaryotic DNA is longer; 5. Eukaryotic DNA contain
introns, prokaryotic DNA does not; 6. Eukaryotic DNA is linear,
prokaryotic DNA is circular; 7. Eukaryotic DNA is associated
with / bound to protein / histones, prokaryotic DNA is not
Haemoglobins are chemically similar molecules found in many
different species. Differences in the primary structure of
haemoglobin molecules can provide evidence of phylogenetic
(evolutionary) relationships between species. Explain how -
answer-1. Mutations change base / nucleotide (sequence); 2.
(Causing) change in amino acid sequence; 3. Mutations build up
over time; 4. More mutations / more differences (in amino acid /
base / nucleotide sequence / primary structure) between distantly
related species; OR Few(er) mutations / differences (in amino
acid / base / nucleotide sequence / primary structure) in closely
related species; 5. Distantly related species have earlier common
ancestor; OR Closely related species have recent common
ancestor
Explain why students were unable to make a conclusion from
the table? -answer--missing information -so cannot compare all
stages -no statistical comparison of standard deviations given or
no measure of significant differences
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