Search found 68 matches

by cytochromeP
Sun Mar 19, 2006 2:19 pm
Forum: Molecular Biology
Topic: Why only L-AAs
Replies: 13
Views: 9695

New Reason 4 Old Q.s

Hi hrushikesh,

Heres a brand new reason for the old problem - Why more L than D in biology ?

Link:
:arrow: http://www.newscientist.com/article/mg18925404.400

Chk it out ppl. 8)
by cytochromeP
Tue Jan 10, 2006 3:46 am
Forum: Molecular Biology
Topic: WHY INTRONS EXIST?
Replies: 20
Views: 16476

Re: WHY INTRONS EXIST?

Hi,

SHEKHAR wrote:WHY INTRONS EXIST? :?:


So that we biologists may have one more extra term to remember. :wink:
by cytochromeP
Tue Jan 10, 2006 3:38 am
Forum: Molecular Biology
Topic: Why only L-AAs
Replies: 13
Views: 9695

Non-Conservation of Parity

Hi, The reason is 'assymetry of fundamental particles due to the non-conservation of parity of the universe.' Non-conservation of parity means that different laws apply to a hypothetical mirror image of our universe. (watever that means....but sounds really cool...) Reference: Physical Chemistry by ...
by cytochromeP
Tue Jan 10, 2006 3:30 am
Forum: Cell Biology
Topic: Steroid Hormone Entry
Replies: 1
Views: 1794

Steroid Hormone Entry

A steroid hormone must pass through the lipid bilayer. How would a steroid hormone break its stable interaction with the bilayer to enter a region which is aqueous? A sub-question to this would be: Consider an intermediate state in steroid hormone entry when it is exactly within the bilayer. Now, sh...
by cytochromeP
Sat Oct 29, 2005 11:53 am
Forum: Genetics
Topic: Conjugation Mapping Basics
Replies: 0
Views: 3091

Conjugation Mapping Basics

My question is regarding bacterial conjugation between Hfr and F -ve. The transfer of DNA from Hfr begins at oriT. The gene closest to oriT on the donor chromosome enters the recepient cell, followed by successive genes on the donor chromosome. The frequency of a particular gene entering the recepie...
by cytochromeP
Mon Oct 03, 2005 1:48 pm
Forum: Site Suggestions
Topic: Biophysics - Where art thou?
Replies: 17
Views: 11812

Well...

Hi, Biophysics is a kind of subject which one generally encounters at a post-graduation level. Majority of the biology students dont tend to have a liking for maths or physics. They therefore will tend to be scared/dislike/avoid biophysics. I agree that not not many 'biophyiscal' questions are being...
by cytochromeP
Mon Oct 03, 2005 1:29 pm
Forum: Molecular Biology
Topic: DNA Basics
Replies: 5
Views: 4167

Re: DNA Basics

Well the logic u have applied is indeed correct. Oops!! Sorie that I missed it first. The logic you applied is indeed flawed. Well the logic you applied sure does explain why a DNA base pair is made up of one Purine and one Pyrimidine. But this does'nt imply that the two starnds are anti-parallel. ...
by cytochromeP
Sun Oct 02, 2005 3:08 pm
Forum: Molecular Biology
Topic: DNA Basics
Replies: 5
Views: 4167

Re: DNA Basics

the diameter of a b form dna helix is 20 angstrom.so in that space only a bicyclic purine and monocyclic pyrimidine can fit in correctly...and thus the strands bcome complementary.....then they obviously have to be antiparallel rite??? Well the logic u have applied is indeed correct. But the questi...
by cytochromeP
Sun Oct 02, 2005 2:59 pm
Forum: Site Suggestions
Topic: Biophysics - Where art thou?
Replies: 17
Views: 11812

Biophysics - Where art thou?

Dear biology-online.org, Biology is witnessing a tremendous age of new discoveries and inventions and technologies. A large chunk of this success story belongs to a plethora of biophysical techniques - NMR, IR, X-ray cryatallography to name a few. Anyone who has gone through any research paper, in p...
by cytochromeP
Tue Sep 27, 2005 5:29 pm
Forum: Molecular Biology
Topic: DNA Basics
Replies: 5
Views: 4167

Thnx

Thnx loupass.

I wont say that i am thoroughly satisfied but now atleast I have two new sources to look up answers from.

Thnx again :D
by cytochromeP
Fri Sep 16, 2005 9:05 pm
Forum: Molecular Biology
Topic: Bacteriophage Question
Replies: 13
Views: 13308

I guess NOT

Hi, Lets say one somehow managed to get a bacteriophage inside a human cell. In order for a bacteriophage (any virus for that matter) to "infect" a human cell it must be able to replicate its DNA inside the human cell. DNA replication involves many stages - intiation, elongation and termination. Eac...
by cytochromeP
Fri Sep 16, 2005 8:39 pm
Forum: Molecular Biology
Topic: DNA Basics
Replies: 5
Views: 4167

DNA Basics

Why are the two strands of a double stranded DNA molecule anti-parallel?

It would be great if someone could support their reason using some real data - like pointing me to a url or some great book which gives the reason :)