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Which configuration is typically found in most naturally occurring amino acids?
The NCERT text mentions, 'Most naturally occurring amino acids have L-configuration. L-Aminoacids are represented by writing the –NH2 group on left hand side.'
A peptide bond is chemically an amide formed between which two functional groups?
The NCERT text states, 'Chemically, peptide linkage is an amide formed between –COOH group and –NH2 group.'
What is the product formed when three amino acids are linked together by peptide bonds?
According to the NCERT text, 'If a third amino acid combines to a dipeptide, the product is called a tripeptide. A tripeptide contains three amino acids linked by two peptide linkages.'
Amino acids are classified based on the nature of their R group. Which of the following is an example of an acidic amino acid?
The NCERT text (BIOLOGY chapter) explicitly states, 'Based on number of amino and carboxyl groups, there are acidic (e.g., glutamic acid), basic (lysine) and neutral (valine) amino acids.' The Chemistry chapter further classifies, 'more carboxyl groups as compared to amino groups makes it acidic.'
Which of the following amino acids contains a methyl group as its R group?
The NCERT Biology text says, 'The R group in these proteinaceous amino acids could be a hydrogen (the amino acid is called glycine), a methyl group (alanine), hydroxy methyl (serine), etc.'
Amino acids behave like salts rather than simple amines or carboxylic acids due to:
The NCERT Chemistry text explains, 'This behaviour [behaving like salts] is due to the presence of both acidic (carboxyl group) and basic (amino group) groups in the same molecule.'
Which of the following statements is TRUE regarding essential amino acids?
The NCERT Chemistry text defines essential amino acids as 'those which cannot be synthesised in the body and must be obtained through diet.'
What is the general formula of an $\alpha$-amino acid, where R represents the side chain?
The NCERT Chemistry text (Table 10.2: Natural Amino Acids) shows the general structure: H2N - CH(R) - COOH or R - CH(NH2) - COOH. The Biology text also refers to them as substituted methanes with hydrogen, carboxyl, amino, and R groups on the $\alpha$-carbon.
Which of the following amino acids is characterized by a benzene ring in its side chain?
Looking at Table 10.2 (Natural Amino Acids) in the NCERT Chemistry text, Phenylalanine (Phe F) has C6H5-CH2- as its characteristic feature of the side chain, which includes a benzene ring.
An amino acid with an equal number of amino and carboxyl groups is classified as:
The NCERT Chemistry text states, 'Equal number of amino and carboxyl groups makes it neutral...'
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