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Medicine

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Test Information
Test Name

CT-BIOCHEMISTRY-II(MD/MS)

Total Questions

60

Test Type

Examination

Difficulty Level

Difficult

Total Marks

240

Duration

60minutes

Test Question Language:- ENGLISH
(1).

The bond connecting the intiation nucleotide of the mRNA with the 5me-G cap structure is a
a. 3’-5’ phosphodiester bridge
b. 5’-5’ triphosphate bridge
c. 3’-3’ triphosphate bridge
d. 3’-5’ triphosphate bridge
Solution. 1) Ans is b: 5’-5’ triphosphate bridge
Eukaryotic mRNA has capping of 7 methyl guanosine triphosphate at 5’end , hic hi linked to an 2’O-methyl ribonucleoside at it’s 5’hydroxyl through 3 phosphate
[Harper- 30th ed-page 365]
Correct Answer. b

(2).

If the tRNA has the sequence 5’-CAU-3’, what codon would it recognize (ignore wobble base pairing)
a. 3’-UAC-5’
b. 3’-AUG-5’
c. 5’-AU-3’
d. 5’-AUG-3’
Solution. 1) Ans is b: 3’-AUG-5’
Codon on the mRNA are read in 3’-5’ direction and tRNA anticodon is matched in antiparallel sequence
Correct Answer. b

(3).

The large eukaryotic rRNA genes,such as 18 S and 28S RNA encoding genes, are transcribed by which of the following RNA polymerase
a. RNA polymerase III
b. RNA polymerase I
c. RNA polymerase II
d. Mitochondrial RNA polymerase
Solution. 1) Ans is b: RNA polymerase I
RNA polymerase I : rRNA
RNA polymerase II: mRNA. mi RNA
RNA polymerase III: tRNA, 5S rRAN , Sn RNA
Correct Answer. b

Copyright © 2014 Delhi Academy of Medical Sciences, All Rights Reserved.

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(4).

One strand of double strand DNA is found to have 20A, 25G, 30C, 22 T . How many of each base is found in complete double strand DNA
a. A= 40, G=50, C=60, T=44
b. A= 44, G=60, C=50, T=40
c. A= 45, G=45, C=52, T=52
d. A= 42, G=55, C=55, T=42
Solution. 1)

Ans is d: A= 42, G=55, C=55,

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