16. The mitotic spindle is a microtubular structure that is involved in a. Split
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16. The mitotic spindle is a microtubular structure that is involved in a. Splitting of the cell (eytokinesis) following mitosis b. Triggering the compaction and condensation of C. Dissolving the nuclear membrane d. Separation of sister chromatids 17. Metaphase is characterized by a. Aligning of chromosomes on the equator or middle of the cell b. Splitting of the centromeres Cytokinesis Separation of sister chromatids c. d. 18. How is a plant cell cytokinesis different from animal cell cytokinesis? a. Plant cells develop cleavage furrow and animal cells form a cell plate b. Plant cells deposit vesicles containing cell-wall building blocks on the metaphase plate; animal cells form a cleavage furrow The structural proteins of plant cells separate the two cells; in animal cells, a cell membrane separates the two daughter cells c. d. Plant cells divide after metaphase but before anaphase; animal cells divide after anaphase 19. At which phase are centrioles beginning to move apart in animal cells and spindle fibers developing? a. Anaphase b. Prometaphase c. Metaphase d. Prophase 20. Taxal is an anticancer drug extracted from the Pacific yew tree. In animal cells, Taxol disrupts microtubule formation. Surprisingly, this stops mitosis. Specifically, Taxol must affect a. The structure of the mitotic spindle b. Anaphase c. Formation of the chromosomes d. Chromatid assembly 21. Homologous chromosomes a. Are pairs from only the paternal line Carry the same genes b. c. d. Carry the exact same alleles Align on the metaphase plate in meiosis II 22. If meiosis produces haploid cells, how is the diploid number restored for those organisms that spend most of their life cycle in the diploid state? a. DNA replication b. Reverse transcription c. Synapsis d. FertilizationExplanation / Answer
16)option B is the correct answer, as microtubules consists of the tubulin protein which undergoes polymerisation to form the spindle apparatus, this makes development of the spindle from centrioles of both end poles attached to chromosome centromere and pulls to separate the chromatids. Later depolymerization forms the condensation so it drag back towards the poles.
17) option A is the correct answer.
In the cell division phase either mitosis or meiosis the centromeric region pulled by spindle fibres in this stage the chromatids arms hanged at the equitorial plate as V metacentric, J acrocentric, I telocenteic,L sub metacentric forms.
18) option B is the correct answer.
During metaphase golgi apparatus deposit cell wall forming materials from vesicles, this helps in the formation of cell plate, when cytokinesis.
19) option B it's prometaphase, after prophase chromosome are condensed to form stunted structures, centrioles are seggrated at poles and spindle fibres are started emerging towards the centre. In metaphase it start binding and forms equitorial plate at centre.
20) option A, taxal is the anticancer drug which is used to inhibits the mitotic spindle formation, so it is used to inhibits cell division process.
21) option B is th correct answer ..same Genes
Homologous chromosome are chromosome in which same Gene's present in same loci, but alleles may be different. These are derived each from parent maternal and paternal.
22) option D is correct answer. At the end of cell division it forms four haploid cells, these are either sperms or egg cells , pollen or ova cells these are matured and fertilised to form zygote which is diploid in nature,that carry state of living through out the life.
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