- A) Oxygen
- B) Phosphorus
- C) Nitrogen
- D) Sulfur
AP Biology MCQ
Total MCQ: 70
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52 Which element is considered the backbone of organic molecules?
- A) Oxygen
- B) Hydrogen
- C) Carbon
- D) Nitrogen
53 What is the primary role of nitrogen in living organisms?
- A) Energy storage
- B) Protein synthesis
- C) Oxygen transport
- D) DNA replication
54 Which element is crucial for the production of ATP?
- A) Phosphorus
- B) Sulfur
- C) Nitrogen
- D) Oxygen
55 What is the role of sulfur in proteins?
- A) Energy source
- B) Structural component
- C) Toxicity
- D) Genetic information
56 Which of the following is a function of phosphorus?
- A) DNA structure
- B) Oxygen transport
- C) Carbon storage
- D) Energy release
57 How does hydrogen contribute to cellular processes?
- A) By forming disulfide bonds
- B) By providing energy
- C) By stabilizing proteins
- D) By aiding in water formation
58 What is the primary function of oxygen in cellular respiration?
- A) Energy storage
- B) Final electron acceptor
- C) Protein synthesis
- D) Nitrogen fixation
59 Which element is a major component of nucleotides?
- A) Carbon
- B) Sulfur
- C) Phosphorus
- D) Hydrogen
60 What is the importance of carbon’s tetra-valence?
- A) Increases reactivity
- B) Stabilizes structures
- C) Allows for complex molecules
- D) Aids in energy storage