211.
Which one of the following precedes re-formation of the nuclear envelope during $$M$$ phase of the cell cycle
A
Decondensation from chromosomes, and reassembly of the nuclear lamina
B
Transcription from chromosomes, and reassembly of the nuclear lamina
C
Formation of the contractile ring, and formation of the phragmoplast
D
Formation of the contractile ring, and transcription from chromosomes
Answer :
Decondensation from chromosomes, and reassembly of the nuclear lamina
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212.
Sporic meiosis occurs in
A
Animals
B
Thallophyta
C
Bryophyta
D
Allplantsexepts thallophyta
Answer :
Allplantsexepts thallophyta
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213.
A somatic cell that has just completed the $$S$$ phase of its cell cycle, as compared to gamete of the same species, has:
A
same number of chromosomes but twice the amount of DNA
B
twice the number of chromosomes and four times the amount of DNA
C
four times the number of chromosomes and twice the amount of DNA
D
twice the number of chromosomes and twice the amount of DNA
Answer :
twice the number of chromosomes and four times the amount of DNA
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214.
Which among the following can be seen only under the electron microscope
A
Chloroplast
B
Ribosome
C
Leucoplast
D
Nucleus
Answer :
Ribosome
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Ribosomes are seen under electron microscope because of highest magnification to more than 200,000x.
215.
Segregation of mendelian factor (Aa) occurs during
A
Diplotene
B
Anaphase I
C
Zygotene/Pachytene
D
Anaphase II
Answer :
Anaphase I
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216.
Meiosis II performs
A
separation of sex chromosomes
B
synthesis of DNA and centromere
C
separation of homologous chromosomes
D
separation of chromatids
Answer :
separation of chromatids
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217.
Which type of division leads to polypoidy
A
Cryptomitosis
B
Meiosis
C
Endomitosis
D
Amitosis
Answer :
Endomitosis
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218.
During cell dicision chromosome move towards different poles due to
A
Centriole
B
Vacuole formation
C
Microtubules
D
Cytokinesis
Answer :
Microtubules
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219.
Eukaryotic cell has
A
One chromatin fiber
B
Definite nucleus
C
Incipient nucleus
D
None of the above
Answer :
Definite nucleus
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220.
What happens in crossing over
A
Duplication of chromosomes
B
Limkage in chromosomes
C
Minimization in genetic material
D
Exchange of genetic material
Answer :
Exchange of genetic material
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