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What is the abbreviation for the constellation Phoenix?

The abbreviation for the constellation Phoenix is "Phe."


2. For the following peptide determine the products of trypsin digest Ala-Glu-Lys-Phe-Val- Cys-Tyr-Met-Gly-Ph?

The trypsin digest of the peptide Ala-Glu-Lys-Phe-Val-Cys-Tyr-Met-Gly-Phe would yield the following fragments: Ala-Glu-Lys, Phe-Val-Cys-Tyr, Met-Gly, Phe. Trypsin cleaves at the C-terminus of lysine and arginine residues, so the peptide is cleaved at the Lys residue.


In the peptide Ala-Try-Gly-Phe the N- Terminal amino acid is?

The N-terminal amino acid in the peptide Ala-Try-Gly-Phe is alanine (Ala) because it is the first amino acid in the sequence.


What is the amino acid order for the following mRNA that codes for a pentapeptide that is an endorphin called leucine enkephalin AUG UAC GGU GGA UUU CUA UAA?

The amino acid order for the mRNA sequence AUG UAC GGU GGA UUU CUA corresponds to the pentapeptide Met-Tyr-Gly-Gly-Phe, which is the endorphin called leucine enkephalin.


Why 2 4 6 trinitro phenol is termed as Picric acid however it does not contain COOH group?

Phenol (without 'trinitro') is already a weak acid: Its Phe-OH group is protolised in water (= deprotonated), pKa=9.89, a very weak acid. Phe-OH + H2O <--> Phe-O- + H3O+ In 2,4,6-trinitrophenol the acidity is very much stimulated by the presence of these 3 nitrogroups in ortho and para position. pKa=0.38, almost a strong acid. (This can be explained by socalled resonance structure stabilisation of the picrate ion, (NO2)3Phe-O- , but this is far beyond the scope of this question).