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Is the amino group composed of one nitrogen and two hydrogen atoms?
The -NH2 group is called an amino group. All the amino acids found in proteins are alpha amino acids. Of the 20 amino acids that are coded for by DNA, 19 have an -NH2 group on the alpha carbon (the carbon adjacent to the carboxyl group). The other amino acid, proline, is similar but the N contributes to a ring formed with the side-chain, and is therefore -NH- .
Is histidine a pyrimidine?
no .....it is a amino acid .though it has imidizole ring it is considered as amino acid.
What amino acid is technically not an amino acid?
proline is not an amino acid it is an imino acid
What is the only amino acid with a double ring?
Tryptophan has a double ring.
Why proline is called imino acid?
The proline side chain forms a closed ring with it's closest carbonyl of the polypeptide backbone. - this is a debated term for referring to proline and hydroxyproline, and is a rather erroneous and antiquated usage. More accurately, proline is an alpha amino acid that has a secondary amino group, rather than the primary amino group found in the other 19 natural amino acids. A secondary amino group is one in which the nitrogen is single bonded to a hydrogen and two sp3-hybridized carbons, whereas a primary amino group is one in which the nitrogen is single bonded to two hydrogens and one sp3-hybridized carbon. An imino acid is a compound that has an imino group and a carboxylic acid group. An imino group is when nitrogen is double bonded to a carbon atom and single bonded to either a hydrogen atom or an sp3-hybridized carbon atom.
Can tryosine is a aliphatic amino acid?
No, tyrosine is not an aliphatic amino acid. It is actually classified as an aromatic amino acid due to its aromatic ring structure. Aliphatic amino acids do not contain aromatic rings in their side chains.
What is an alpha-lactam?
In organic chemistry, an alpha-lactam is a lactam - the nitrogen analogue of a lactone - with a three-membered ring structure.
Is proline aromatic?
Proline is not aromatic. While the ring does have 2+4n free electrons (from the nitrogen), the fact that the carbon adjacent to the nitrogen has three sigma bonds means that there is not an open pi orbital for electrons to resonate in.
What amino acid has a phenyl group as its R group?
The R-group in the phenylalanine amino acid is: CH2-benzene ring
What is the amino acid responsible for the Hopkins-cole reaction?
The amino acid responsible for the Hopkins-Cole reaction is the tryptophan because of its indole ring that in the reaction forms a violet color upon treatment of the sample with glyoxylic acid and sulfuric acid.
Which amino acids in protein contain a phenolic group?
Tyrosine is the amino acid in proteins that contains a phenolic group. Phenolic groups are characterized by a hydroxyl group attached directly to an aromatic ring. Tyrosine has an aromatic ring with a hydroxyl group attached to it, making it a phenolic amino acid.
Which amino acid has a ring?
Histidine is an amino acid that contains an imidazole ring in its side chain. The imidazole ring gives histidine unique chemical properties, making it important in enzyme catalysis and protein structure.
