Question

Select the common respiratory substrates.

• A. Glucose and fructose
• B. Trigylcerides and phospholipids
• C. Keratin and melanin
• D. DNA and RNA

Answer 1

The correct option is A Glucose and fructose

Respiratory substrates are those organic substances that are broken down during respiration to liberate energy inside the living cells. The various respiratory substrates are carbohydrates, fats, proteins and organic acids. The most common respiratory substrate is glucose. It is a hexose sugar. It is a monosaccharide. Another related compound is fructose. It is also a hexose monosaccharide.

Triglycerides and phospholipids are types of fats. They are used as respiratory substrates only if the body lacks carbohydrates.

DNA and RNA are nucleic acids.

Keratin and melanin are proteins.