Name the part of a cell in which many chemical reactions occur with the help of enzymes.

Name the part of a cell in which a network of chromatin fibres occurs.

A chemical reaction cannot occur at all if its

State three characteristics that show a chemical reaction has occurred.

An enzyme promotes a chemical reaction by

An enzyme promotes a chemical reaction by

Name two elements which show chemical reactions similar to magnesium.

Substances that take part in a chemical reaction

In the diagram drawn alongside (i) Label the parts a, b and c. (ii) In which part does the light reaction occur? (iii) Name the part which the dark phase of photosynthesis occur in.

Name a cell that has many nuclei

Enzymes increase rate of chemical reaction by