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There should be five peaks. In the process of bombarding the Br2 molecule with electrons to charge it, the molecule can fragment into 2 Br atoms. We should therefore expect to see peaks at 79 and 81 m/z. ...

Prophase, metaphase, anaphase, and telophase.

This is a typical A-level Spanish question which requires the candidate to use the past tense.

An antibody is a chemical released during an infection by lymphocytes that attach to specific antigens.

This is a typical A Level or Pre-U style Spanish discursive writing or oral question which requires the candidate to respond using a range of tenses and sophisticated vocabulary to talk about things relev...