● The `color{Brown}"complete combustion of glucose"`, which produces `CO_2` and `H_2O` as `color{violet}"end products"`, yields `color{violet}"energy"` most of which is given out as `color{violet}"heat"`.
● If this `color{violet}"energy is to be useful"` to the cell, it should be able to `color{violet}"utilise it to synthesise"` other molecules that the `color{violet}"cell requires"`.
● The strategy that the`color{violet}" plant cell uses"` is to `color{Brown}"catabolise the glucose"` molecule in such a way that `color{violet}"not all the liberated energy"` goes out as `color{violet}"heat"`.
● The key is to `color{violet}"oxidise glucose"` not in one step but in `color{violet}"several small steps"` enabling `color{violet}"some steps"` to be `color{violet}"just large enough"` such that the energy released can be `color{violet}"coupled to ATP"` synthesis.
● How this is done is, essentially, the `color{violet}"story of respiration"`.
● During the `color{violet}"process of respiration"`, `color{violet}"oxygen"` is utilised, and `color{violet}"carbon dioxide"`, water and energy are released as products.
● The `color{violet}"combustion reaction"` requires oxygen.
● But some `color{violet}"cells live"` where `color{violet}"oxygen"` may or may not be `color{violet}"available"`.
● There are `color{violet}"sufficient reasons"` to believe that the `color{violet}"first cells on this planet"` lived in an atmosphere that `color{violet}"lacked oxygen"`.
● Even among `color{violet}"present-day living organisms,"` we know of several that are `color{Brown}"adapted to anaerobic"` conditions.
● Some of these organisms are `color{Brown}"facultative anaerobes"`, while in others the requirement for an`color{violet}"aerobic condition"` is `color{Brown}"obligate"`.
● In any case, `color{violet}"all living organisms"` retain the enzymatic machinery to `color{violet}"partially oxidise glucose"` without the help of oxygen.
● This breakdown of `color{violet}"glucose to pyruvic acid"` is called `color{brown}"glycolysis."`
● The `color{Brown}"complete combustion of glucose"`, which produces `CO_2` and `H_2O` as `color{violet}"end products"`, yields `color{violet}"energy"` most of which is given out as `color{violet}"heat"`.
● If this `color{violet}"energy is to be useful"` to the cell, it should be able to `color{violet}"utilise it to synthesise"` other molecules that the `color{violet}"cell requires"`.
● The strategy that the`color{violet}" plant cell uses"` is to `color{Brown}"catabolise the glucose"` molecule in such a way that `color{violet}"not all the liberated energy"` goes out as `color{violet}"heat"`.
● The key is to `color{violet}"oxidise glucose"` not in one step but in `color{violet}"several small steps"` enabling `color{violet}"some steps"` to be `color{violet}"just large enough"` such that the energy released can be `color{violet}"coupled to ATP"` synthesis.
● How this is done is, essentially, the `color{violet}"story of respiration"`.
● During the `color{violet}"process of respiration"`, `color{violet}"oxygen"` is utilised, and `color{violet}"carbon dioxide"`, water and energy are released as products.
● The `color{violet}"combustion reaction"` requires oxygen.
● But some `color{violet}"cells live"` where `color{violet}"oxygen"` may or may not be `color{violet}"available"`.
● There are `color{violet}"sufficient reasons"` to believe that the `color{violet}"first cells on this planet"` lived in an atmosphere that `color{violet}"lacked oxygen"`.
● Even among `color{violet}"present-day living organisms,"` we know of several that are `color{Brown}"adapted to anaerobic"` conditions.
● Some of these organisms are `color{Brown}"facultative anaerobes"`, while in others the requirement for an`color{violet}"aerobic condition"` is `color{Brown}"obligate"`.
● In any case, `color{violet}"all living organisms"` retain the enzymatic machinery to `color{violet}"partially oxidise glucose"` without the help of oxygen.
● This breakdown of `color{violet}"glucose to pyruvic acid"` is called `color{brown}"glycolysis."`