Short answerEasy1 mark
1(g)
Expand the following biological abbreviations:
ATP
Topic: ATP
Previous-year question practice database
Answer
Exam answer
ADENOSINE TRIPHOSPHATE.
Explanation
ATP is the ENERGY CURRENCY of the cell. Energy is STORED when a third phosphate is added to ADP, and RELEASED when it is removed.
ADP + phosphate + ENERGY → ATP
The prefix names the number of phosphates: DI- two (ADP), TRI- three (ATP). In photosynthesis, ATP is made in the LIGHT reaction by photophosphorylation and spent in the DARK reaction to build glucose.