The Question is from neet-botany cell-cycle-and-cell-division mitosis, and it was created by the author K SURESH KUMAR

Question

The spindle fibers attach to the chromosomes at the:

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: B
## CONCEPT FRAMEWORK
 **Primary Concept**: Cell division, specifically mitosis and meiosis.
 **Related Topics**: Chromosomes, centromeres, kinetochores, telomeres, chromatids, spindle apparatus.
 **Prerequisites**: Basic understanding of cell structure and the process of cell division.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the attachment point of spindle fibers to chromosomes.
  The options are: Centromere, Kinetochore, Telomere, Chromatid.
**Method & Steps**:
 1. Understand the role of spindle fibers in cell division.
  Reasoning: Spindle fibers are responsible for separating sister chromatids during cell division. They achieve this by attaching to specific structures on the chromosomes.
  Formula/Rule: None directly applicable.
 2. Identify the structure where spindle fibers attach.
  Working: The kinetochore is a protein structure located at the centromere of each chromosome.  Spindle fibers attach to the kinetochore, not directly to the centromere itself. The centromere is the region where the two sister chromatids are joined. Telomeres are located at the ends of chromosomes, and chromatids are the two identical copies of a chromosome.
  Key Point:  The kinetochore is crucial for proper chromosome segregation during cell division. 
 3. Select the correct option.
  Result: The correct option is B, Kinetochore.
  Verification: The definition of the kinetochore and its role in cell division confirm the correctness of the answer.
 ## OPTION ANALYSIS
A :x: Centromere: While the centromere is the region where the kinetochore is located, the spindle fibers attach to the kinetochore, not directly to the centromere itself.
B ✓: Kinetochore: This is the correct answer. The kinetochore is a protein complex that assembles on the centromere and serves as the attachment point for spindle fibers.
C :x: Telomere: Telomeres are protective caps at the ends of chromosomes and are not involved in spindle fiber attachment.
D :x: Chromatid: Chromatids are the two identical copies of a chromosome; the spindle fibers attach to the kinetochore on each chromatid.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing centromere and kinetochore:  Remembering that the kinetochore is a *structure* on the centromere helps avoid this mistake.
  2. Focusing on the centromere as the point of attachment: Understanding that the kinetochore mediates the attachment is key.
 **Quick Tips**:
  1. Visualize the structure of a chromosome during mitosis or meiosis, noting the centromere and kinetochore.
  2. Remember the word 'kinetochore'  as it directly implies the attachment point ('kineto' meaning movement).

K SURESH KUMAR · Answer

Centromere

K SURESH KUMAR · Answer

The correct Option is "Kinetochore"

K SURESH KUMAR · Answer

Telomere

K SURESH KUMAR · Answer

Chromatid

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