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GATE BT-2017 Answer Key | Solutions Discussion
#41
tRNA is not involved in elongation step as amimo avud moved over mRNA chain.
#42
(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
#43
(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?
Sunil Nagpal
MS(Research) Scholar, IIT Delhi (Alumnus)
Advisor for the Biotech Students portal (BiotechStudents.com)
Computational Researcher in BioSciences at a leading MNC


Suggested Reads:
Top Biotech Companies | Top places to work
Indian Biotech Companies and Job Openings
Aiming a PhD in Top Grad School? | These are the Important Points to Consider
Careers in Biotechnology | A list of various Options
Biotechnology Competitive Exams in India
#44
Which of the following is activated by macrophages?
1 basophils
2 CD4+
3 neutrophil
#45
I think basophils is the ans...
#46
In which of the following two cell cycles the chromosome number remains diploid ?
1 G1
2 G2
3 S
4 M
#47
(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.
Sunil Nagpal
MS(Research) Scholar, IIT Delhi (Alumnus)
Advisor for the Biotech Students portal (BiotechStudents.com)
Computational Researcher in BioSciences at a leading MNC


Suggested Reads:
Top Biotech Companies | Top places to work
Indian Biotech Companies and Job Openings
Aiming a PhD in Top Grad School? | These are the Important Points to Consider
Careers in Biotechnology | A list of various Options
Biotechnology Competitive Exams in India
#48
(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.
Sunil Nagpal
MS(Research) Scholar, IIT Delhi (Alumnus)
Advisor for the Biotech Students portal (BiotechStudents.com)
Computational Researcher in BioSciences at a leading MNC


Suggested Reads:
Top Biotech Companies | Top places to work
Indian Biotech Companies and Job Openings
Aiming a PhD in Top Grad School? | These are the Important Points to Consider
Careers in Biotechnology | A list of various Options
Biotechnology Competitive Exams in India
#49
A polypeptide has 4 cysteine residues. How many intra-chain disulphide bond could be made with these 4 residues? (Memory based)
#50
(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..
Sunil Nagpal
MS(Research) Scholar, IIT Delhi (Alumnus)
Advisor for the Biotech Students portal (BiotechStudents.com)
Computational Researcher in BioSciences at a leading MNC


Suggested Reads:
Top Biotech Companies | Top places to work
Indian Biotech Companies and Job Openings
Aiming a PhD in Top Grad School? | These are the Important Points to Consider
Careers in Biotechnology | A list of various Options
Biotechnology Competitive Exams in India
  
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