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
D. tRNA *

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 :

C. NAD *
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