Which domain is considered to be the oldest?

10 Oldest Domains on the Internet

sri.com. ...

xerox.com. ...

northrop.com. Date of Domain Registration: November 7, 1985. ...

mcc.com. Date of Domain Registration: July 11, 1985. ...

think.com. Date of Domain Registration: May 24, 1985. ...

bbn.com. Date of Domain Registration: April 24, 1985. ...

Symbolics.com. Date of Domain Registration: March 15, 1985. ...

Darpa (. net, .

Explanation:

hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh  

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure