Carbohydrates are organic molecules and contain three elements:
Correct answer: D. Carbon, hydrogen, and oxygen
- A. Carbon, water, and oxygen
- B. Carbon, sulfur, and hydrogen
- C. Carbon, calcium, and hydrogen
- D. Carbon, hydrogen, and oxygen
Explanation
Carbohydrates are organic molecules composed of three elements: carbon (C), hydrogen (H), and oxygen (O). The general formula for carbohydrates is typically represented as Cn(H2O)n, which reflects the ratio of hydrogen to oxygen being 2:1, similar to water. This distinguishes carbohydrates from other organic molecules that might contain different elements or ratios.Option A is incorrect because water is not an element. Option B is incorrect because sulfur is not typically part of carbohydrates. Option C is incorrect because calcium is not a component of carbohydrates.
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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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