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Select the CORRECT statement from the fo...

Select the CORRECT statement from the following.

A

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

B

Chromosomes are arranged along the equator during prophase

C

Chromosomes is made up of two sister chromatids at anaphase of mitosis .

D

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

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze each of the provided statements regarding mitosis and identify which one is correct. Let's break down each statement step by step: ### Step 1: Analyze the first statement **Statement:** "During mitosis, endoplasmic reticulum and nucleolus disappear completely at early prophase." - **Analysis:** The endoplasmic reticulum and nucleolus do not disappear completely at early prophase. They typically disappear during late prophase. Therefore, this statement is incorrect. ### Step 2: Analyze the second statement **Statement:** "Chromosomes are arranged along the equator during prophase." - **Analysis:** Chromosomes are not arranged along the equator during prophase; they align at the metaphase plate during metaphase. Hence, this statement is also incorrect. ### Step 3: Analyze the third statement **Statement:** "Chromosomes are made up of two sister chromatids at anaphase of mitosis." - **Analysis:** At anaphase, sister chromatids are separated and pulled to opposite poles of the cell. Therefore, chromosomes are not made up of two sister chromatids at this stage; they are individual chromatids. This statement is incorrect. ### Step 4: Analyze the fourth statement **Statement:** "Small disc-shaped structures at the surface of centromeres that appear during metaphase are kinetochores." - **Analysis:** Kinetochores are indeed the disc-shaped structures that form at the centromere of each chromosome during metaphase. They are crucial for the attachment of spindle fibers to chromosomes. This statement is correct. ### Conclusion After analyzing all the statements, the correct answer is: **Correct Statement:** "Small disc-shaped structures at the surface of centromeres that appear during metaphase are kinetochores." ### Final Answer **The correct statement is:** "Small disc-shaped structures at the surface of centromeres that appear during metaphase are kinetochores." ---
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