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First respiratory substrate :...

First respiratory substrate :

A

Lipid

B

Protein

C

Carbohydrates

D

both (a) and (c)

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**Step-by-Step Solution:** 1. **Understanding Respiratory Substrates**: - Respiratory substrates are the food molecules that are broken down during respiration to release energy. 2. **Identifying the Primary Function of Carbohydrates**: - The primary function of carbohydrates is to provide energy to the organism. This makes carbohydrates the most important respiratory substrate. 3. **Role of Other Macromolecules**: - While carbohydrates are the primary respiratory substrates, fats and proteins can also serve as substrates under certain conditions. - Fats can be broken down into fatty acids and glycerol, which can then enter the respiration pathway. - Proteins are broken down into amino acids, which undergo deamination to form organic acids that can enter the respiration pathway. 4. **Order of Preference for Respiratory Substrates**: - The order of preference for respiratory substrates is: 1. Carbohydrates (e.g., glucose) 2. Fats 3. Proteins 5. **Conclusion**: - Therefore, the first respiratory substrate is carbohydrates, specifically glucose. ---
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