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Q31. One of the following compounds is NOT a neurotransmitter (A) Dopamine (B) Glutamic acid (C) Histidine (D) Glycine Answer: (C) Histidine Histidine is not a neurotransmitter, while the others […]

Q30. Amino acids responsible for N-linked and O-linked glycosylation of proteins are (A) Asparagine and Aspartic acid (B) Glutamine and Serine (C) Glutamic acid and Serine (D) Asparagine and Threonine […]

Q29. A DNA-binding motif is (A) Helix-loop-helix (B) Helix-turn-helix (C) Helical wheel (D) Loop-helix-loop Correct Answer: (B) Helix-turn-helix The helix-turn-helix (HTH) motif is the classic DNA-binding motif in transcription factors, […]

Q28. Positive selection of T cells ensures (A) MHC restriction (B) Self tolerance (C) TCR engagements (D) Activation by co-stimulatory signal Positive selection of T cells primarily ensures MHC restriction […]

Q27. In tryptophan operon, tryptophan acts as (A) Repressor (B) Activator (C) Co-repressor (D) Co-activator Correct Answer: (C) Co-repressor Tryptophan serves as a co-repressor in the trp operon, binding to […]

Q.26 Nucleolus is involved in the synthesis of (A) rRNA (B) tRNA (C) DNA (D) mRNA Answer: (A) rRNA The nucleolus is the site of ribosomal RNA (rRNA) synthesis within the […]

Reaction Sequence Problem Q.25 The structure of Y in the above reaction sequence is: (A) Structure A (B) Structure B (C) Structure C (D) Structure D Structure of Y in […]

Reaction Sequence Problem Q.24 The structure of X in the above reaction sequence is: (A) Structure A (B) Structure B (C) Structure C (D) Structure D  Introduction In this reaction […]

The ionization constants of phosphorous acid (H3PO3) are: Ka1 = 3 × 10−2, Ka2 = 1.7 × 10−7 Q.23 The structure of phosphorous acid is: O || HO — P […]

The ionization constants of phosphorous acid (H3PO3) are: Ka1 = 3 × 10−2, Ka2 = 1.7 × 10−7 Q.22 For a dilute solution of phosphorous acid in a pH 5 […]