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Difficulty: HardCell Biology, Genetics, and Evolution

Match the cellular structures and molecular machinery listed in List-I with their corresponding specialized biological functions listed in List-II:

  • PeroxisomeDecomposition of hydrogen peroxide and oxidative β\beta-oxidation of fatty acids
  • NucleolusTranscription and assembly of ribosomal RNA (rRNArRNA) subunits
  • SpliceosomeExcising non-coding intron sequences from precursor mRNA (pre-mRNApre\text{-}mRNA)
  • CentrosomeOrganization of microtubule arrays and regulation of mitotic spindle formation

Answer

Peroxisome matches with decomposition of hydrogen peroxide and oxidative β\beta-oxidation of fatty acids; Nucleolus matches with transcription and assembly of ribosomal RNA (rRNArRNA) subunits; Spliceosome matches with excising non-coding intron sequences from precursor mRNA (pre-mRNApre\text{-}mRNA); Centrosome matches with organization of microtubule arrays and regulation of mitotic spindle formation.
Each cellular component is accurately mapped to its primary physiological role: Peroxisomes carry out β\beta-oxidation and peroxide detoxification; the Nucleolus synthesizes ribosomal RNA subunits; Spliceosomes carry out RNA splicing by excising introns; and Centrosomes act as microtubule organizing centers for spindle formation.

Step-by-Step Solution

1
Identify the metabolic role of Peroxisomes
Peroxisomes house oxidative enzymes including catalase to metabolize toxic H2O2H_2O_2 and break down fatty acids through β\beta-oxidation.
This differentiates peroxisomes from lysosomes, which focus on hydrolytic digestion of macromolecules.
2
Identify the sub-nuclear region function of the Nucleolus
The nucleolus specifically transcribes rRNArRNA genes and initial subunit construction.
Protein translation itself occurs in the cytoplasm or rough endoplasmic reticulum, while ribosome building originates in the nucleolus.
3
Determine the nuclear ribonucleoprotein function of the Spliceosome
Spliceosomes catalyze post-transcriptional splicing, removing non-coding introns from eukaryotic pre-mRNA.
Prokaryotes lack spliceosomes due to co-transcriptional translation and lack of spliceosomal introns.
4
Establish the structural role of the Centrosome
Centrosomes contain centrioles (in animal cells) and organize the microtubule spindle during mitosis and meiosis.
Spindle fibers attach to kinetochores to segregate chromosomes during cell division.

Key Concept

Eukaryotic Cell Organelle and Molecular Machinery Specialization
Estimated Time:1m 30s
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Topics

Cell Biology, Genetics, and Evolution

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