The sequencing in DNA and chemical nature of proteins have been used as the basis of classification by

Options

A. Cytotaxonomist
B. Karyotaxonomist
C. Chemotaxonomist
D. `alpha`-taxonomist

Answer

To solve the question regarding the classification based on DNA sequencing and the chemical nature of proteins, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Components**:
- DNA is composed of nucleotides, which are the building blocks of DNA. The sequence of these nucleotides encodes genetic information.
- Proteins are made up of amino acids, which are linked together in specific sequences to form various proteins.

2. **Identify the Classification Method**:
- The question mentions classification based on the sequencing of DNA and the chemical nature of proteins. This implies a focus on the molecular and chemical characteristics of these biological macromolecules.

3. **Analyze the Options**:
- The first option is "cytotaxonomist," which refers to classification based on the cytoplasm and does not relate to DNA or protein sequencing.
- The second option is "karyotaxonomist," which refers to classification based on the nucleus. Again, this does not pertain to the sequencing of DNA or the chemical nature of proteins.
- The third option is "chemotaxonomist," which relates to the classification of organisms based on their chemical composition, including DNA and proteins.

4. **Select the Correct Answer**:
- Since the question specifically refers to the sequencing of DNA and the chemical nature of proteins, the correct classification method is "chemotaxonomist."

### Final Answer:
The sequencing in DNA and the chemical nature of proteins have been used as the basis of classification by **chemotaxonomists**.

---