Question

Which statement is true? CTP hydrolysis can be a source of chemical energy. dATP is the most common source of chemical energy in cells. Hydrolysis of ATP to ADP and phosphate releases about 14 kJ/mol of free energy. Hydrolysis of the α, β and β, γ phosphoester bonds of a nucleotide is used as a source of chemical energy.

Answer 1

1. Statement A is true.

When GTP is hydrolysed, the free energy of hydrolyses is used to power or drive reactions that are favourable energetically.

2. Statement B it true.

ATP is a complex chemical that gives energy for the activities in many living cells. During hydrolyses, chemical energy stored in the energy-rich phosphoanhydride is released. Hence its a common source of chemical energy in cells.

3. Statement C is false.

The hydrolyses of ATP to ADP in the presence of phosphate, releases one mole of ATP which is estimated to be -57Kj/mol not 14Kj/mol. Below is the equation;

ATP + H20 -----> ADP + Pi + Free energy.

4. Statement D is false.

GTP stands for guanosine triphosphate.

ATP stands for adenosine triphosphate

ADP stands for adenosine diphosphate.