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Respiration is an energy-releasing and enzymatically controlled catabolic process

Question:

Respiration is an energy-releasing and enzymatically controlled catabolic process which involves a step-wise oxidative breakdown of organic substances inside living cells.

In this statement about respiration explain the meaning of

(1) Step-wise oxidative breakdown, and

(2) Organic substances (used as substrates).

Solution:

(1) Step-wise oxidative breakdown:

The energy will be released in a stepwise manner during cellular respiration which is moderated enzymatically.

(2) Organic substances (used as substrates):

Organic substances like carbohydrates used as substrates and oxidized during the respiratory process for releasing energy.

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