Carbohydrates are composed of:
Correct answer: D. Carbon, hydrogen and oxygen
- A. Carbon, nitrogen and oxygen
- B. Carbon, hydrogen, oxygen and phosphorus
- C. Carbon, hydrogen, oxygen and nitrogen
- D. Carbon, hydrogen and oxygen
Explanation
Carbohydrates are organic compounds consisting of carbon, hydrogen, and oxygen. The general formula for carbohydrates is often Cn(H2O)m, reflecting the 'hydrated carbon' nature, where hydrogen and oxygen are usually present in a 2:1 ratio, similar to water. This distinguishes them from other biomolecules like proteins and nucleic acids, which include nitrogen, and lipids, which may include phosphorus. Options A, B, and C include elements not typically found in carbohydrates.
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About Biological Molecules
The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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