Respiration is an exergonic reaction. An exergonic reaction is one in
which energy is released, and as a result the products of this reaction
will have less energy than the original products. Cellular respiration
can also be referred to as a catabolic pathway, which means bigger
molecules get broken down into smaller molecules and therefore there is
extra energy at the end of the reaction.
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The cell cycle is controlled by many cell cycle control factors, namely cyclins, cyclin-dependent kinases (Cdks) and cyclin-dependent kinase inhibitors (CKIs). Cyclins and Cdks, which are positive regulators of the cell cycle, activate cell cycle factors that are essential for the start of the next cell cycle phase.