Multiple Choice
Which major group of macromolecules serves as the fastest source of energy in biological systems?
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1. Introduction to Biochemistry
Carbohydrates
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Which of the following is a primary function of carbohydrates in biological systems?
A
Catalyzing biochemical reactions as enzymes
B
Facilitating the transport of oxygen in blood
C
Storing genetic information
D
Providing energy through metabolic pathways such as glycolysis
Verified step by step guidance1
Understand the role of carbohydrates in biological systems. Carbohydrates are organic molecules composed of carbon, hydrogen, and oxygen, and their primary function is to provide energy to cells.
Recall that carbohydrates are broken down into simpler sugars, such as glucose, which serve as a primary energy source for cellular processes.
Review the metabolic pathway of glycolysis, where glucose is converted into pyruvate, generating ATP (adenosine triphosphate), the energy currency of the cell.
Eliminate the incorrect options: Enzymes are proteins, not carbohydrates, and are responsible for catalyzing biochemical reactions. Hemoglobin, a protein, facilitates oxygen transport in blood. Genetic information is stored in nucleic acids (DNA and RNA), not carbohydrates.
Conclude that the primary function of carbohydrates is to provide energy through metabolic pathways like glycolysis, making this the correct answer.
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