Which statement correctly compares nucleic acids and carbohydrates?
A) They both contain phosphorus, but only nucleic acids contain hydrogen.
B) They both contain carbon, hydrogen, and oxygen in a 1:2:1 ratio.
C) They both contain carbon, but only carbohydrates contain oxygen.
D) They both contain carbon, but only nucleic acids contain phosphorous.
The Correct Answer and Explanation is :
The correct answer is D) They both contain carbon, but only nucleic acids contain phosphorus.
Explanation:
Nucleic Acids and Carbohydrates are two fundamental types of macromolecules vital for life, but they serve different functions and have distinct structural components.
1. Composition:
- Nucleic Acids: These include DNA and RNA, which are composed of long chains of nucleotides. Each nucleotide consists of a sugar (deoxyribose in DNA and ribose in RNA), a phosphate group, and a nitrogenous base (adenine, thymine, cytosine, or guanine). Importantly, nucleic acids contain phosphorus, which is a key component of the phosphate backbone that connects nucleotides.
- Carbohydrates: These molecules primarily serve as energy sources and structural components in organisms. They consist of sugar units (monosaccharides) linked together. Common examples include glucose, sucrose, and cellulose. Carbohydrates are composed of carbon, hydrogen, and oxygen, typically in a ratio of 1:2:1, but they do not contain phosphorus.
2. Function:
- Nucleic Acids: Their primary role is to store and transmit genetic information. DNA holds the instructions for building proteins and regulating cellular activities, while RNA plays a crucial role in protein synthesis.
- Carbohydrates: They are primarily energy sources. For instance, glucose is a key fuel for cellular respiration. Carbohydrates can also serve as structural components (e.g., cellulose in plant cell walls).
3. Key Differences:
- One of the fundamental differences is the presence of phosphorus in nucleic acids and its absence in carbohydrates. This distinction is critical in their respective functions and roles in biological systems.
In summary, while both nucleic acids and carbohydrates contain carbon, the presence of phosphorus in nucleic acids distinguishes them from carbohydrates, confirming that option D is the correct comparison.