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.

Get full Socratic AI guidance on this question — free in the Applaa desktop app
Appy Buddy guides you step-by-step toward the answer without giving it away. Type your attempt and get instant, mark-scheme-aware clues that teach you to think like an examiner.
Join Applaa Community
Create your own games, learn AI concepts, program interactive apps, and share with a kid-safe community approved by parents. Free forever on Windows and Mac.
Available for Windows and macOS · COPPA Compliant
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.
While Other Kids Get an AI Head Start, Is Yours Falling Behind?
Give your child the same AI app-building, exam prep and tutoring edge — free for the first month, no credit card needed.
Join 10,000+ students building their first AI-powered apps with Applaa