Question

Match List-I with List-II
{|p{7cm}|p{7cm}|} List-I (Column A) & List-II (Colums B)
(A) DNA is found at the end of the linear eukaryotic chromosome & (I) Centromere
(B) Protein structure on eukaryotic chromosomes where spindle fiber attaches & (II) Telomere
(C) DNA site where kinetochores are found & (III) Nucleolar organizer
(D) DNA sequence that serves as the template for synthesis and amplification & (IV) Kinetochore

• (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
• (A) - (II), (B) - (IV), (C) - (I), (D) - (III)
• (A) - (I), (B) - (II), (C) - (IV), (D) - (III)
• (A) - (III), (B) - (IV), (C) - (I), (D) - (II)

Hint:

Do not confuse the centromere with the kinetochore:
- Centromere = The DNA region (the landing pad).
- Kinetochore = The protein complex built on that DNA (the anchor for spindle fibers).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
This matching question covers the structural and functional components of eukaryotic chromosomes involved in cell division and genetic organization.

Step 3: Detailed Explanation:
Let us analyze each pair individually:
(A) DNA found at the end of the linear eukaryotic chromosome:
The repetitive, non-coding DNA sequences located at the very tips of linear chromosomes are called telomeres.
They protect the chromosome ends from degradation and fusion.
Hence, (A) matches with (II).
(B) Protein structure where spindle fibers attach:
The kinetochore is a large, disc-shaped protein complex assembled on the centromere.
It serves as the physical attachment site for spindle microtubule fibers during mitosis and meiosis.
Hence, (B) matches with (IV).
(C) DNA site where kinetochores are found:
The centromere is the specialized, constricted region of DNA on a chromosome where the kinetochore protein complex is assembled.
Hence, (C) matches with (I).
(D) DNA sequence serving as a template for synthesis and amplification:
The nucleolar organizer region (NOR) is a chromosomal region containing genes for ribosomal RNA (rRNA), which serves as a template for synthesizing ribosomal components and organizing the nucleolus.
Hence, (D) matches with (III).

Step 4: Final Answer:
The correct matching sequence is:
(A) - (II), (B) - (IV), (C) - (I), (D) - (III).
This matches Option (B).