1. The amino acid glycine is often used as the main ingredient of a buffer in biochemical experiments. The amino group of glycine, which has a pKa of 9.6, can exist either in the protonated form(-NH3+) or as the free base(-NH2) because of the reversible equilibrium

Why are nearly all amino acids in organisms left-handed(exception is glycine which has no isomer) when abiotic samplestypical have an even mix of left- and right-handed molecules?

28) Random copolymers were synthesized using polynucleotide phosphorylase with only 2 nucleotides present in the ratio 3C:2U.

*What is the expected frequecy of the 5' CUU 3' codon in the resulting RNA molecules?

*Suppose 16% of the amino acids incorporated during polypeptide synthesis in this random copolymer experiment were glycines, what conclusion can be drawn regarding which codon(s) specifiy(ies) glycine? Do not consult the genetic code table since this is a theoretical question.

For an α-helical polyalanine peptide 45.00 residues in length, calculate the melting temperature in °C. Tm= °C

Calculate the melting temperature of a 45.00 amino acid α-helical peptide if that peptide contains all alanines and a single internal glycine residue. Tm= °C

Calcuate the melting temperature if the 45.00 amino acid α-helical peptide contains 5.00 internal glycine residues and a glycine at the N-terminus of the helix. Tm= °C

Calculate the melting temperature for a 45.00 amino acid polyhistidine peptide at physiological pH in a 310-helix. Tm= °C