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#kinetochores

9 public questions tagged with this topic.

BOTANY

What is the role of kinetochores during ll division?

Kinetochores are protein structures at the ntromere that facilitate chromosome movement by attaching to spindle fibers. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Botany section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Botany portion (Latest NCERT Textbooks for Academic Session 2026-27 -

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Cell Division

How many kinetochores are present in a human cell at mitosis?

Kinetochore count reflects chromosome and chromatid numbers fundamental to ploidy understanding. Human diploid somatic cell harbors 46 chromosomes, each defined by single centromere region where kinetochore assembles providing attachment site to spindle microtubules and checkpoint signaling platform. In G1, each chromosome contains one chromatid and one functional centromere kinetochore assembly site. During S phase, DNA replication converts each chromosome into two sister chromatids held together by cohesin, each sister chromatid retains its own centromere capable of assembling independent ki

Ref: Cleveland et al., Cell 2003, Centromere and Kinetochore Number. Alberts 7th ed., Chapter 17.

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Cell Division

How do mitotic spindles attach to chromosomes?

Faithful chromosome segregation depends on physical linkage between centromeric DNA and spindle microtubules via kinetochore large protein machine exceeding 100 components organized into layered architecture. Inner kinetochore permanently bound to centromere during cell cycle contains constitutive centromere-associated network including CENP-C that recognizes CENP-A nucleosome, plus CENP-T-W-S-X tetramer forming DNA binding module with histone-like fold. Outer kinetochore assembled specifically in mitosis contains KMN network: Knl1 scaffold with MELT motifs recruiting checkpoint proteins, Mis1

Ref: Cheeseman & Desai, Annu Rev Cell Dev Biol 2008, Kinetochore Structure. Musacchio & Desai, Biology 2017.

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