1671. For de novo synthesis of purine nucleotides, glycine provides :
A. One nitorgen atom
B. One nitrogen and one carbon atom
C. Two carbon atoms
D. One nitrogen and two carbon atoms *
1672. To form thymine , a methyl group is added to carbon no 5 of :
A. Xanthine
B. Uracil *
C. Cytosine
D. Guanine
E. Adenine
1673. Non-coding sequences in RNA are known as :
A. Cistrons
B. Non sense codons
C. Introns *
D. Exons
E. Promoter regions
1674. The enzyme responsible for the synthesis of mRNAs in eukaryotic cells is :
A. RNA polymerase I
B. RNA polymerase II *
C. RNA polymerase III
D. RNA polymerase Alpha
E. Telomerase
1675. Anticodons are present on :
A. Coding strand of DNA
B. Non-coding strand of DNA
C. mRNA
D. tRNA *
E. rRNA
1676. The one carbon source that converts dump to dTMP IS :
A. N5-methyFH4
B. NIO-Formyl FH4
C. N5,N10-Methylene FH4 *
D. N5, N10 Mehthenyl FH4
E. N5- Formimmo FH4
1677. Replication of DNA is :
A. Conservative
B. Semi-conservative *
C. Non-Conservative
D. None of the above
1678. Ribonucleotides of RNA primer are replaced by deoxyribonucleotides by the enzyme :
A. DNA polymerase I *
B. DNA Polymerase II
C. DNA Polymerase III
D. RNA polymerase II
E. RNA polymerase III
1679. A cofactor in the transformation of dihydroorotate to orotic corrosive, catalyzed by theenzyme dihydroorotate dehydrogenase is :
A. FAD
B. FMN
C. NAD *
D. NADP
E. FH4
1680. Orotic aciduria type I reflects the deficiency of enzymes :
A. Orotate phosphoribosyl transfease and orotidylate decarboxylase *
B. Dihydroorotate dehydrogenase
C. Dihydroorotase
D. Carbamoyl phosphate synthetase
E. Xanthine oxidase