Question

The chromatids of a chromosome are attached at a point called

• A. Centriole.
• B. Centromere.
• C. Chromomere.
• D. Centrosome.

Answer 1

The correct option is B

Centromere.

The correct option is B:

Explanation of the correct option.

1. During cell division, the centromere connects two sister chromatids.
2. The centromere is the point where the chromatids of a chromosome are attached.
3. It's a section of DNA that's crucial for their separation throughout cell division's latter phases.
4. They are still regarded one chromosome as long as the sister chromatids are linked at the centromere.

Explanation of the incorrect options

Option A:

1. Centrioles are two barrel-shaped organelles found near the nuclear envelope in the cytoplasm of animal cells.
2. Centrioles are a crucial component of centrosomes and play a role in the cytoplasmic structure of microtubules.
3. They help to determine the nucleus' and other organelles' positions within the cell.

Option C:

1. Chromomeres are tiny bead-shaped aggregates of coiled chromatin that are linearly distributed along the chromosome and are strongly stained.
2. A chromomere, also known as an idiomere, is one of the eukaryotic chromosome's serially aligned beads or granules formed by local coiling of a continuous DNA thread.
3. Chromomeres are chromatin areas that have been compressed by localized contraction.

Option D:

The centrosome, which consists of two centrioles surrounded by an electron-density matrix and pericentriolar material, is the principal microtubule-organizing centre (MTOC) in eukaryotic cells.

Final answer:

The chromatids of a chromosome are attached at a point called Centromere.