tRNA is not involved in elongation step as amimo avud moved over mRNA chain.
(02-10-2017, 07:29 PM)ISunilNagpal Wrote: [ -> ]Hi Sangam,
Could you please clean it up a bit? And, the questions which you seek answers for, could you please post them clearly for everyone here?
A separate post (reply) for each question would be useful.
Thanks
In which of the following TWO cell cycles the chromosome number is diploid?
1 G1
2 G2
3 S
4 M
(02-10-2017, 08:15 PM)RONIT SHARMA Wrote: [ -> ]tRNA is not involved in elongation step as amimo avud moved over mRNA chain.
Pardon me Ronit, if I have forgotten the concepts, but isn't elongation about picking up of 'amino-acid containing tRNA (
aa-tRNA)' molecules by (some elongation factors)? And also about the tRNA anticodon matching in this step? Won't this be a major involvement of tRNA in elongation?
Which of the following is activated by macrophages?
1 basophils
2 CD4+
3 neutrophil
I think basophils is the ans...
In which of the following two cell cycles the chromosome number remains diploid ?
1 G1
2 G2
3 S
4 M
(02-10-2017, 09:42 PM)Akshay shinde Wrote: [ -> ]In which of the following two cell cycles the chromosome number remains diploid ?
1 G1
2 G2
3 S
4 M
It's a bit confusing question....ploidy isn't supposed to change in any of the phases. It's the total DNA content that gets doubled in S phase and remains so in G2 phase. So, if by diploid, they mean the original state of cell, then it is
G1 and M (because in S phase, DNA has doubled and it remains so in G2 phase as well, till daughter cells are produced in M phase).
Ideally, cell remains diploid even in S phase as it's the DNA content (in form of new chromatids) that gets doubled, not the number of chromosomes.
(02-10-2017, 09:31 PM)Akshay shinde Wrote: [ -> ]Which of the following is activated by macrophages?
1 basophils
2 CD4+
3 neutrophil
CD4+ are helper T cells (Th cells) and they need macrophages to get activated.
A polypeptide has 4 cysteine residues. How many intra-chain disulphide bond could be made with these 4 residues? (Memory based)
(02-10-2017, 11:33 PM)CHANDA7 Wrote: [ -> ]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..