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Hydrogen

Hydrogen

(Science: chemistry, element) hydrogen is a gas element which has an atomic number of 1 and an atomic weight of 1.0079. It combines with oxygen to form water (H20) and is present in all organic compounds. a few types of bacteria can metabolise atmospheric hydrogen (H2). Hydrogen gas itself is not poisonous, but when it mixes with air it can easily ignite or explode. Hydrogen was discovered by henry Cavendish in 1766 and was named by Lavoisier.

there are two main isotopes of hydrogen: deuterium (2H) and tritium (3H, which is radioactive and is used in some glow-in-the-dark paints and as a tracer in biological studies).

Abbreviation: H


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Re: Structure of Chromosomes

Thank you very much, Canalon. However, I do question your notion that DNA should be counted as two molecules. The joining by hydrogen bonds qualifies the structure as a single molecule. By that reasoning you would always be looking at the vast number of single complex molecules that ...

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by bobc2
Fri Sep 04, 2009 7:30 pm
 
Forum: Molecular Biology
Topic: Structure of Chromosomes
Replies: 4
Views: 26

Structure of Chromosomes

... separate DNA molecules. Your first explanation is correct but 1 double helix of DNA is strictly speaking composed of 2 DNA molecules attached by hydrogen bonds (and a lot of them)

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by canalon
Fri Sep 04, 2009 7:02 pm
 
Forum: Molecular Biology
Topic: Structure of Chromosomes
Replies: 4
Views: 26

maping and linkage problems

... and why the following circumstances influence characteristics of temperature-induced DNA melting. a. Percentage of GC base pairs b. Urea (forms hydrogen bonds with bases) c. Sodium chloride (neutralizes negatively charged phosphates) Friends please help me out. i dont get any of those answers. ...

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by hemu0912
Sun Jul 26, 2009 5:59 pm
 
Forum: Genetics
Topic: maping and linkage problems
Replies: 4
Views: 166

DNA question.

actually the greater stability of GC base pairs is due mainly not to the fact that they have more hydrogen bonds, but due to more base stalking in the case of gc base pairs

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by MrMistery
Sat Jul 11, 2009 8:31 pm
 
Forum: Molecular Biology
Topic: DNA question.
Replies: 3
Views: 280

DNA question.

Perfect post by kolean, in terms of hydrogen bonding adenine and thymine are linked by 2 hydrogen bonds while guanine and cytosine are linked with 3 hydrogen bonds, thus the DNA strand with the greater ratio of CG will thus have more hydrogen ...

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by prokaryotics
Sat Jul 11, 2009 9:11 am
 
Forum: Molecular Biology
Topic: DNA question.
Replies: 3
Views: 280
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