AP BIOLOGY

Detailed explanation-1: -ATP hydrolysis provides the energy needed for many essential processes in organisms and cells. These include intracellular signaling, DNA and RNA synthesis, Purinergic signaling, synaptic signaling, active transport, and muscle contraction.

Detailed explanation-2: -The energy required for cellular respiration to begin is supplied by two ATP molecules. This occurs in the first part of cellular respiration, called glycolysis. This diagram shows that ATP is used in the first and third steps of glycolysis.

Detailed explanation-3: -Cells do not use the energy from oxidation reactions as soon as it is released. Instead, they convert it into small, energy-rich molecules such as ATP and nicotinamide adenine dinucleotide (NADH), which can be used throughout the cell to power metabolism and construct new cellular components.

Detailed explanation-4: -If a cell needs to spend energy to accomplish a task, the ATP molecule splits off one of its three phosphates, becoming ADP (Adenosine di-phosphate) + phosphate. The energy holding that phosphate molecule is now released and available to do work for the cell.

Detailed explanation-5: -All cells use chemical energy. is the energy stored in the bonds between atoms of every molecule. To stay alive, cells must be able to release the chemical energy in the bonds. A major energy source for most cells is stored in a sugar molecule called When you need energy, cells release chemical energy from glucose.