MCQ Book Questions

Q51640. The distance spanned by one turn of B- form DNA is

Q51641. In a DNA molecule the thymine concen- tration is 30%, the guanosine concentra- tion will be

Q51642. IN a DNA molecule, the guanosine content is 40%, the adenine content will be

Q51643. An increased melting temperature of du- plex DNA results from a high content of

Q51644. A synthetic nucleotide analogue, 4-hydro- xypyrazolopyrimidine is used in the treatment of

Q51645. A synthetic nucleotide analogue, used in the chemotherapy of cancer and viral infections is

Q51646. Histamine is formed from histidine by the enzyme histidine decarboxylase in the presence of

Q51647. Infantile convulsions due to lesser formation of gamma amino butyric acid from glutamic acid is seen in the de- ficiency of

Q51648. Which of the following amino acids pro- duce a vasoconstrictor on decarboxyla- tion?

Q51649. The degradation of RNA by pancreatic ribonuclease produces

Q51650. Intestinal nucleosidases act on nucleo- sides and produce

Q51651. In purine biosynthesis carbon atoms at 4 and 5 position and N at 7 position are contributed by

Q51652. N10-formyl and N5N10-methenyl tetrahy- drofolate contributes purine carbon atoms at position

Q51653. In purine nucleus nitrogen atom at 1 position is derived from

Q51654. The key substance in the synthesis of purine, phosphoribosyl pyrophosphate is formed by

Q51655. In purine biosynthesis ring closure in the molecule formyl glycinamide ribosyl-5- phosphate requires the cofactors:

Q51656. Ring closure of formimidoimidazole carboxamide ribosyl-5-phosphate yields the first purine nucleotide:

Q51657. The cofactors required for synthesis of adenylosuccinate are

Q51658. Conversion of inosine monophosphate to xanthine monophosphate is catalysed by

Q51659. Phosphorylation of adenosine to AMP is catalysed by