Every chromosome essentially has a primary construction or the ...... , on the sides of which disc shaped structures called .... are present

Options

A. Centrosome, centromere
B. Chromocenter , centromere
C. Centromere , kinetochores
D. Centromere, centromere

Answer

To solve the question, we need to identify the terms that fill in the blanks regarding the structure of a chromosome.

### Step-by-Step Solution:

1. **Understanding Chromosome Structure**:
- A chromosome consists of two sister chromatids joined together. The point where these two chromatids are joined is crucial for chromosome function during cell division.

2. **Identifying Primary Construction**:
- The term "primary construction" refers to the specific region of the chromosome where the two chromatids are connected. This region is known as the **centromere**.

3. **Identifying Disc-Shaped Structures**:
- On either side of the centromere, there are structures that play a vital role during cell division. These structures are called **kinetochores**. Kinetochores are protein complexes that form on the centromere and are essential for the attachment of spindle fibers during mitosis.

4. **Final Answer**:
- Therefore, the complete statement is: "Every chromosome essentially has a primary construction or the **centromere**, on the sides of which disc-shaped structures called **kinetochores** are present."

### Answer:
C. centromere kinetochores

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