Wednesday, June 16, 2010

Quotes - Wilbur D. Nesbit



Your flag and my flag,



And how it flies to-day



In your land and my land



And half a world away!



Rose-red and blood-red



The stripes for ever gleam;



Snow-white and soul-white



The good forefathers dream;



Sky-blue and true-blue, with stars to gleam aright



The gloried guidon of the day; a shelter through the night.

Tuesday, June 15, 2010

Amity University

This is my University where i learned a lot during my 4 years of professional course. i make many close friends who help me out in my troubles............

Monday, June 14, 2010

DNA vs RNA


                                                         DNA


                                   RNA
1. DNA is the usual genetic material
1. RNA is the genetic material   of some viruses.
2. DNA is usually double-stranded, (In certain viruses DNA is single stranded, e.g. φ X 174).
2. Most cellular RNA is single stranded. (Some viruses e.g. reovirus, have double stranded RNA).
3. The pentose sugar is deoxyribose.
3. The pentose sugar is ribose.
4. The common organic bases are adenine, guanine, cytosine and thymine.
4. The common organic bases are adenine, guanine, cytosine and uracil.
5. Base pairing: adenine pairs with thymine and guanine with cytosine.
5. Adenine pairs with uracil and guanine with cytosine.
6. Pairing of bases is throughout the length of the molecule.
6. Pairing of bases is only in the helical region
7. There are fewer uncommon bases
7. There are more uncommon bases.
8. DNA is only of one type
8. There are three types of RNA messenger ribosomal and transfer RNA.
9. Most of the DNA is found in the chromosomes. Some DNA is also found in the cytoplasm e.g. in mitochondria and chloroplasts.
9. Messenger RNA is formed on the chromosomes, and is found in the nucleolus and cytoplasm. rRNA and tRNA are also formed on the chromosomes, and are found in cytoplasm.
10. Denaturation (melting) is partially reversible only under certain conditions of slow cooling (renaturation).
10. Complete and practically in­ stantaneous reversibility of the process of melting.
11. Sharp, narrow temperature interval of transition in melting.
11. Broad temperature interval of transition in melting.
12. DNA on replication forms DNA, and on transcription forms RNA.
12. Usually RNA does not repli­cate or transcribe. (In certain viruses RNA can synthesize an RNA chain).
13. Genetic messages are usually encoded in DNA.
13. The usual function of RNA is translating messages en­coded in DNA into proteins.
14. DNA consists of a large number of nucleotides, up to 4.3 million
14. RNA consists of fewer nucleotides, up to 12,000