Which of the following is a set of essential amino acids?
- Glycine, Alanine, Tyrosine, Glutamic acid
- Glycine, Alanine, Threonine, Lysine
- Tyrosine, Glutamic acid, Valine, Leucine
- Leucine, Threonine, Alanine, Tyrosine
The Correct Option is A
Solution and Explanation
Humans can produce 10 of the 20 amino acids. The others must be supplied with food. Failure to obtain enough of even 1 of the 10 essential amino acids, those that we cannot make, results in degradation of the body's proteins muscle and so forth to obtain the one amino acid that is needed. Unlike fat and starch, the human body does not store excess amino acids for later use. The amino acids must be in the food every day. The 10 amino acids that we can produce are alanine, asparagine, aspartic acid, cysteine, glutamic acid, glutamine, glycine, proline, serine, and tyrosine. Tyrosine is produced from phenylalanine, so if the diet is deficient in phenylalanine, tyrosine will be required as well.
Hence, the correct option is (A): Glycine, Alanine, Tyrosine, Glutamic acid.
Top Questions on Amines
For the reaction sequence given below, the correct statement(s) is(are):
Amines have a lone pair of electrons on the nitrogen atom, due to which they behave as Lewis bases. Greater the value of \( K_b \) or smaller the value of \( pK_b \), stronger is the base. Amines are more basic than alcohols, ethers, esters, etc. The basic character of aliphatic amines should increase with the increase of alkyl substitution. However, it does not occur in a regular manner, as a secondary aliphatic amine is unexpectedly more basic than a tertiary amine in aqueous solutions. Aromatic amines are weaker bases than ammonia and aliphatic amines. Electron-releasing groups such as \( -CH_3 \), \( -NH_2 \), etc., increase the basicity, while electron-withdrawing substituents such as \( -NO_2 \), \( -CN \), halogens, etc., decrease the basicity of amines. The effect of these substituents is more pronounced at the para-position than at the meta-position.
Arrange the following in increasing order of their basic character. Give reason:
- Give plausible explanation for each of the following:
Amides are less basic than amines. - Give plausible explanation for each of the following:
Aromatic primary amines cannot be prepared by Gabriel Phthalimide synthesis. - Arrange the following compounds in increasing order of their boiling point:
\[ \text{(CH}_3\text{)}_2\text{NH, CH}_3\text{CH}_2\text{NH}_2, \text{CH}_3\text{CH}_2\text{OH} \]
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