Name the specific component(s) that form deoxyadenosine.

Options

A. A phosphate group
B. adenine
C. both a and b
D. thymine

Answer

To answer the question "Name the specific component(s) that form deoxyadenosine," we can break down the components involved in its formation step by step.

### Step-by-Step Solution:

1. **Understanding Deoxyadenosine**:
- Deoxyadenosine is a nucleoside that is composed of three main components: a sugar, a nitrogenous base, and a phosphate group.

2. **Identifying the Sugar**:
- The sugar in deoxyadenosine is **deoxyribose**. The term "deoxy" indicates that this sugar lacks one oxygen atom compared to ribose, which is found in RNA.

3. **Identifying the Nitrogenous Base**:
- The nitrogenous base present in deoxyadenosine is **adenine**. Adenine is one of the four primary bases found in nucleic acids.

4. **Identifying the Phosphate Group**:
- Deoxyadenosine can also be linked to a **phosphate group**. This phosphate group is essential for forming nucleotides, which are the building blocks of DNA.

5. **Combining the Components**:
- Therefore, deoxyadenosine is formed by the combination of:
- Deoxyribose (sugar)
- Adenine (nitrogenous base)
- Phosphate group (linkage)

### Final Answer:
The specific components that form deoxyadenosine are:
- Deoxyribose (sugar)
- Adenine (nitrogenous base)
- Phosphate group