Biologia IBPaper 2, listopad 2025, TZ3wzorowane16 pktotwarteśrednie (szac.)
Molecular binding underlies both communication and metabolic regulation. (a) Describe complementary molecules in cell-signalling systems, with examples. (b) Explain causes and consequences of changes to enzyme active sites. (c) Outline how reversible changes…
Biologia IBPaper 1, maj 2023, TZ1wzorowane1 pktzamkniętełatwe (szac.)
An aminoacyl-tRNA synthetase joins a particular amino acid to its matching tRNA using ATP. Why does the same enzyme not normally attach a different amino acid? A. ATP can supply energy to only one chemical reaction in a cell B. The active site has substrate…