281.
During cell division, the spindle fibres attach to the chromosome at a region called
A
chromocentre
B
kinetochore
C
centriole
D
chromomere
Answer :
kinetochore
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282.
Ribonuclease, a mitotic poison, inhibits cell cycle in
A
Interphase
B
Prophase
C
Metaphase
D
Anaphase
Answer :
Interphase
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283.
Synaptonemalcomplexis characteristic of
A
Mitotic chromosomes
B
Leptotene chromosomes
C
Paried meiotic chromosomes
D
Metaphase
Answer :
Paried meiotic chromosomes
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284.
In which stage the Chromosomes combine and begin to separate from each the during meiosis cell division
A
Pachytene
B
Dipolotene
C
Zygotene
D
Diakiness
Answer :
Dipolotene
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285.
A mature plant cell has
A
Cell wall and protoplasm
B
Protoplasm and vacuole
C
Vacuole and cell wall
D
Protoplasm cell wall and vacuole
Answer :
Protoplasm cell wall and vacuole
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286.
Select the correct option with respect to mitosis.
A
Chromatids separate but remain in the centre of the cell in Anaphase
B
Chromatids start moving towards opposite poles in telophase
C
Golgi complex and endoplasmic reticulum are still visible at the end of prophase
D
Chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase
Answer :
Chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase
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287.
Material exchange through nucleopores is faciliate by
A
Lamina propria
B
lipid layer
C
Nucleoplasmin
D
Nucleoles
Answer :
Nucleoplasmin
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288.
Best material for the study of mitosis in laboratory is
A
anther
B
root tip
C
leaf tip
D
ovary
Answer :
root tip
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289.
In Angiosperms, Endomitosis occurs in
A
Ocule
B
Tapetum
C
Endothecium
D
Leaftip
Answer :
Tapetum
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290.
Mitotic Anaphase differs from metaphase in possessing
A
same number of chromosomes and same number of chromatids
B
half number of chromosomes and half number of chromatids
C
half number of chromosomes and same number of chromatids
D
same number of chromosomes and half number of chromatids
Answer :
same number of chromosomes and half number of chromatids
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