[CHANDA7]

A polypeptide has 4 cysteine residues. How many intra-chain disulphide bond could be made with these 4 residues? (Memory based)

Disulfide needs a pair of residues, so it should be 2 bonds..

Hi Sunil sir.... I can't memorize the question clearly...May be it was how many different types....That's why I answered 6..... What do you think if it is how many "different" types?

[SunilNagpal]

If it is about number of different ways those 2 bonds can form between the 4 residues, then it should be 3 ways (i think so...not sure though...) 6 is number of combinations of residue pairs possible, while there is one way of bonding per 2 pairs of residues....so it should be 3 ways of bonding...

a-------a---------a---------a

way1: a1-a2 a3-a4

way2: a1-a3 a2-a4

way 3: a2-a3 a1-a4

This exhausts all possible combinations...

3 ways it should be...

[CHANDA7]

If it is about number of different ways those 2 bonds can form between the 4 residues, then it should be 3 ways (i think so...not sure though...) 6 is number of combinations of residue pairs possible, while there is one way of bonding per 2 pairs of residues....so it should be 3 ways of bonding...

a-------a---------a---------a

way1: a1-a2 a3-a4

way2: a1-a3 a2-a4

way 3: a2-a3 a1-a4

This exhausts all possible combinations...

3 ways it should be...

Okkay.... Thanks....

[SãñGáM Mìshra]

3; way right ans.

[SãñGáM Mìshra]

And in q,s of cell cycle .... Main theme is ... The completion of genome duplication and before mitosis begin....it must be duplicated in end of G2 phase . so ans. Is s and G2.

[SunilNagpal]

And in q,s of cell cycle .... Main theme is ... The completion of genome duplication and before mitosis begin....it must be duplicated in end of G2 phase . so ans. Is s and G2.

Hello sangam,
Thanks for the input but I couldn't understand the theme suggested by you...could you please elaborate? And was the question about DNA content or about the ploidy?

[SãñGáM Mìshra]

And in q,s of cell cycle .... Main theme is ... The completion of genome duplication and before mitosis begin....it must be duplicated in end of G2 phase   . so ans. Is s and G2.

[quote pid='11517' dateline='1486744676']
Hello sangam,

Thanks for the input but I couldn't understand the theme suggested by you...could you please elaborate? And was the question about DNA content or about the ploidy?
[/quote]

Nither dna content nor ploidy . only .. End of which phases of cell cycle ( mitosis ) the completion of genome duplication takes place..

[SunilNagpal]

And in q,s of cell cycle .... Main theme is ... The completion of genome duplication and before mitosis begin....it must be duplicated in end of G2 phase   . so ans. Is s and G2.

[quote pid='11517' dateline='1486744676']
Hello sangam,

Thanks for the input but I couldn't understand the theme suggested by you...could you please elaborate? And was the question about DNA content or about the ploidy?

Nither dna content nor ploidy . only .. End of which phases of cell cycle ( mitosis ) the completion of genome duplication takes place..
[/quote]
In that case S and G2 are indeed the two phases..

[SãñGáM Mìshra]

Thnxx......little more SIR

BEST REGARDS,
SANGAM MÌSHRÅ

[RONIT SHARMA]

Thnxx......little more SIR

BEST REGARDS,
SANGAM MÌSHRÅ

I guess question was: At the end of which phase of cell cycle there is "2n" number of chromosomes.