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Find out the correct statement...

Find out the correct statement

A

During mitosis endoplasmic reticulum and nucleolus disappear completely at early prophase.

B

Chromosomes are arranged along the equator during prophase of mitosis

C

Chromosome is made up of two sister chromatids at anaphase of mitosis

D

Small disc shaped structures at the surface of the centromeres that appear during metaphase are kinetochores.

Text Solution

AI Generated Solution

The correct Answer is:
To find the correct statement among the given options regarding mitosis, we will analyze each option step by step. ### Step-by-Step Solution: 1. **Option 1: "Mitosis's endoplasmic reticulum and nucleolus disappear completely at early prophase."** - In early prophase, the nuclear envelope begins to break down, and the nucleolus starts to fade, but they do not completely disappear until late prophase. Therefore, this statement is **incorrect**. 2. **Option 2: "Chromosomes are arranged along the equator during the prophase of mitosis."** - The arrangement of chromosomes along the equatorial plane occurs during metaphase, not prophase. During prophase, chromosomes condense and become visible, but they are not yet aligned at the equator. Thus, this statement is also **incorrect**. 3. **Option 3: "Chromosome is made up of two sister chromatids at anaphase of mitosis."** - During anaphase, the sister chromatids are pulled apart and move towards opposite poles of the cell. At this stage, each chromatid is considered an individual chromosome. Therefore, this statement is **incorrect** as well. 4. **Option 4: "There is a small disc-shaped structure at the surface of the centromere that appears during the metaphase, called kinetochore."** - This statement is correct. The kinetochore is a protein structure that forms on the centromere during metaphase, allowing spindle fibers to attach to the chromosomes for their movement. Thus, this statement is **correct**. ### Conclusion: The correct answer is **Option 4**: "There is a small disc-shaped structure at the surface of the centromere that appears during the metaphase, called kinetochore." ---
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