What are the 6 essential amino acids?
Essential amino acids cannot be made by the body. As a result, they must come from food.
How many amino acids are in 6 codons?
As there are 64 different codons and only 20 amino acids are encoded by the DNA bases, this is not surprising. For example, six codons specify leucine, serine, and arginine, and four codons specify glycine, valine, proline, threonine, and alanine.
What is the 1st amino acid?
The first few amino acids were discovered in the early 19th century. In 1806, French chemists Louis-Nicolas Vauquelin and Pierre Jean Robiquet isolated a compound in asparagus that was subsequently named asparagine, the first amino acid to be discovered.
What is pK1 and pK2?
pK1 are around 2.2, so at physiological pH the carboxyl groups are deprotonated. • pK2 are around 9.4, so at physiological pH the amino groups are protonated. • Therefore, an amino acid can act as an acid or base, depending on the pH of the solution – substances with this property are called AMPHOLYTES.
Which amino acid is always the first one in a protein?
Methionine is specified by the codon AUG, which is also known as the start codon. Consequently, methionine is the first amino acid to dock in the ribosome during the synthesis of proteins.
What is pK value?
A measure of the strength of an acid on a logarithmic scale. The pK value is given by log10(1/Ka), where Ka is the acid dissociation constant. pK values are often used to compare the strengths of different acids.
Which amino acid has the highest pI value?
| Amino acid | pKa1 | pI |
|---|---|---|
| Glutamic acid | 2.19 | 3.22 |
| Lysine | 2.18 | 9.74 |
| Arginine | 2.17 | 10.76 |
| Histidine | 1.82 | 7.59 |
