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Архив постов
At alkaline pH, the amino group of an amino acid is:
At acidic pH, an amino acid is mainly in which form?
In the formation of a tetrapeptide from four free amino acids, how many molecules of water are released?
Tyrosine is a precursor for which of the following?
Hydroxyproline and hydroxylysine are important for:
Which amino acid is the direct precursor of serotonin?
Which amino acid contains a phenolic hydroxyl group ?
More than 300 amino acids exist in nature, but proteins are mainly composed of 20 standard α-amino acids.
Which amino acid can exist in both protonated and neutral forms near physiological pH because of its side chain?
Which of the following amino acids is classified as essential?
Which amino acid contains a thioether group in its side chain?
Which amino acid becomes essential when dietary methionine intake is low?
Which amino acid becomes essential in patients with phenylketonuria (PKU)?
Which amino acid is the most abundant free amino acid in the human body?
