A-Level BiologyYear 2017Q5
Page 04 5. The diagram shows a molecule of tRNA. Region Z Bond Y Region X A C U Which row in the table identifies Region X, Bond Y and Region Z? Region X Bond Y Region Z A amino acid attachment site hydrogen anticodon B anticodon hydrogen amino acid attachment site C amino acid attachment site peptide anticodon D anticodon peptide amino acid attachment site 6. New species have evolved when two populations have become A isolated by a behavioural barrier B unable to interbreed to produce fertile offspring C very different due to directional selection D very different due to disruptive selection.
Paper Source:NH_Biology_all_2017.pdf
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Exam Specification Info
This question is part of the UK A-Level Biology syllabus. In the actual exam, structured questions typically require linking specific keywords to gain full marks. Applaa helps you drill these topics.
Syllabus levelAdvanced Level (A-Level)
SubjectBiology
Official MarksVariable (2–6 marks)