Match List-I with List-II

List-I (Column A)	List-II (Column 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

Choose the correct answer from the options given below:

Correct option is B

Explanation of the Correct Option (b): (A)-(II), (B)-(IV), (C)-(IV), (D)-(III)
(A) DNA is found at the end of the linear eukaryotic chromosome → (II) Telomere
· Telomeres are repetitive DNA sequences at chromosome ends.
· They protect chromosomes from degradation and fusion.
(B) Protein structure on eukaryotic chromosomes where spindle fiber attaches → (IV) Kinetochore
· Kinetochore is a protein complex.
· It serves as the attachment site for spindle microtubules during cell division.
(C) DNA site where kinetochores are found → (I) Centromere
· Centromere is the DNA region on the chromosome.
· Kinetochores assemble on the centromere.
(D) DNA sequence that serves as the template for synthesis and amplification → (III) Nucleolar organizer
· Nucleolar organizer regions (NORs) contain rRNA genes.
· They are responsible for ribosomal RNA synthesis and nucleolus formation.
Explanation of Other Options
Option (a)
· Incorrect because:
· Kinetochores are not DNA sites; they are protein structures.
Option (c)
· Incorrect because:
· Telomeres are not centromeres.
· DNA for nucleolus formation is not at centromere.
Option (d)
· Incorrect because:
· Telomeres are not nucleolar organizers
Key Points Related to the Question
· Telomere → End of chromosome (DNA)
· Centromere → DNA region for kinetochore formation
· Kinetochore → Protein complex for spindle attachment
· Nucleolar organizer (NOR) → rRNA gene cluster