ATP is usually referred to as the energy currency of a cell. It is chemically.......(A)....... and the set of elements.............(B)........... forms its structure.

Options

A. `{:((A),"(B)"),("Nucleoside","C,H,O,N, and P"):}`
B. `{:((A),"(B)"),("Vitamin derivative ","C,H,O,N, and P"):}`
C. `{:((A),"(B)"),("Nucleotide","C,H,O,N, and P"):}`
D. `{:((A),"(B)"),("Vitamin derivative ","C,H,O,S, and P"):}`

Answer

To solve the question regarding ATP (adenosine triphosphate) being referred to as the energy currency of a cell, we need to fill in the blanks with the correct terms.

### Step-by-Step Solution:

1. **Identify what ATP is chemically**:
- ATP stands for adenosine triphosphate. It is a type of molecule known as a nucleotide.
- Nucleotides are the building blocks of nucleic acids and consist of three components: a nitrogenous base, a pentose sugar, and phosphate groups.

**Fill in the blank (A)**: "ATP is usually referred to as the energy currency of a cell. It is chemically **a nucleotide**."

2. **Determine the set of elements that form its structure**:
- The structure of ATP includes:
- **Nitrogenous base**: Adenine (which contains nitrogen and carbon).
- **Pentose sugar**: Ribose (which contains carbon, hydrogen, and oxygen).
- **Phosphate groups**: These contain phosphorus and oxygen.
- Therefore, the elements present in ATP are carbon (C), hydrogen (H), oxygen (O), nitrogen (N), and phosphorus (P).

**Fill in the blank (B)**: "The set of elements **carbon, hydrogen, oxygen, nitrogen, and phosphorus** forms its structure."

### Final Answer:
ATP is usually referred to as the energy currency of a cell. It is chemically **a nucleotide** and the set of elements **carbon, hydrogen, oxygen, nitrogen, and phosphorus** forms its structure.

---