which is false about naturally occurring a-amino acids?
they belong to the D family of chiral compounds related to D-glyceraldehyde
all are chiral except for glycine
each has a characteristic isoelectric point the ph at which there is no net migration of the amino acid toward either electrode in an electrophoresis experiment
they form salts with both strong acids and strong bases
Is it a-amino acids or amino acids? Try this site on amino acids: (Broken Link Removed)
Sra
alpha-amino
To determine which statement is false about naturally occurring α-amino acids, let's examine each statement individually:
Statement 1: "They belong to the D family of chiral compounds related to D-glyceraldehyde."
This statement is true. Naturally occurring α-amino acids are classified as D-amino acids and are related to D-glyceraldehyde in terms of chirality.
Statement 2: "All are chiral except for glycine."
This statement is true. Chirality refers to an object's ability to exist in two different mirror-image forms, known as enantiomers. All naturally occurring α-amino acids, except for glycine, have chiral centers and exist in the L-form.
Statement 3: "Each has a characteristic isoelectric point, the pH at which there is no net migration of the amino acid toward either electrode in an electrophoresis experiment."
This statement is true. Each α-amino acid has a unique isoelectric point (pI), which is the pH at which the amino acid carries no net electrical charge. At the pI, the amino acid will not migrate towards either the positive or negative electrode in an electrophoresis experiment.
Statement 4: "They form salts with both strong acids and strong bases."
This statement is false. Naturally occurring α-amino acids only form salts with strong acids, not with strong bases. When an α-amino acid reacts with a strong acid, it loses its proton (H+) from the amino group, forming a positively charged amino acid ion or a salt.
Therefore, the false statement about naturally occurring α-amino acids is: "They form salts with both strong acids and strong bases."