Among the following respiratory substrates,wh | vedclass

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(D) In cellular respiration,various organic compounds are oxidized to release energy. These compounds are known as respiratory substrates. $1$. Carboh

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Carbohydrates

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(D) In cellular respiration,various organic compounds are oxidized to release energy. These compounds are known as respiratory substrates. $1$. Carbohydrates (specifically glucose) are the primary and most preferred respiratory substrates used by cells to generate $ATP$ through glycolysis and the $TCA$ cycle. $2$. Fats are used as respiratory substrates only when carbohydrates are depleted. $3$. Proteins are used as respiratory substrates only under conditions of starvation or extreme stress. $4$. Organic acids are used as respiratory substrates in certain plants (e.g.,succulents). Therefore,carbohydrates are the main source of energy for cellular activities.

Among the following respiratory substrates,which one is the main source of energy?

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