Answer:
Living cells obtain
energy through respiration. It is the process of generating energy in the form
of ATP molecules by breaking down food molecules like glucose, fats, etc.
The process starts
with glycolysis which occurs in cytoplasm producing pyruvic acid. It is then
converted to acetyl Co-A, which enters mitochondrial matrix. This initiates the
tricarboxylic acid cycle.
This cycle
is said to be amphibolic because many intermediate compounds formed in this
cycle act as precursors for biosynthesis of many important biological
molecules, i.e., co-enzymes, vitamins, hormones. Besides this, many molecules,
i.e., fatty acids, aminoacids, co-enzymes etc, can enter this cycle directly.
Acetyl Co-A
is related to synthesis and breakdown of fatty acids, steroids, carotenoids
terpenes and aromatic compounds, a- ketoglutarate and oxaloacetate are row
materials for synthesis of amino acids like glutamate and aspartate and also
pyrimidines and alkaloids.
Succinyl
forms pyrroole compunds like cytochrome and chlorophyll.
So, it is
the cycle where both breakdown and synthesis reactions keep on going simultaneously,
the following figure shows interrelationship among metabolic pathway showing
respiration mediated break down of different organic molecule.
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