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NUCLEIC ACIDS- Part 6
See all quizzes of NUCLEIC ACIDS- Part 6 here:
1 Repressor binds to DNA sequence and
regulate the transcription. This sequence
is called
(A) Attenuator (B) Terminator
(C) Anti terminator (D) Operator
2. Okazaki fragment is related to
(A) DNA synthesis (B) Protein synthesis
(C) mRNA formation (D) tRNA formation
3. The region of DNA known as TATA BOX is
the site for binding of
(A) DNA polymerase
(B) DNA topoisomerase
(C) DNA dependent RNA polymerase
(D) Polynucleotide phosphorylase
4. Reverse transcriptase is capable of
synthesising
(A) RNA → DNA (B) DNA → RNA
(C) RNA → RNA (D) DNA → DNA
5. A tetrovirus is
(A) Polio virus (B) HIV
(C) Herpes virus (D) Tobacco mosaic virus
6. Peptidyl transferase activity is located in
(A) Elongation factor
(B) A charged tRNA molecule
(C) Ribosomal protein
(D) A soluble cytosolic protein
7. Ultraviolet light can damage a DNA strand
causing
(A) Two adjacent purine residue to form a
covalently bounded dimer
(B) Two adjacent pyrimidine residues to form
covalently bonded dimer
(C) Disruption of phosphodiesterase linkage
(D) Disruption of non-covalent linkage
8. Defective enzyme in Hurler’s syndrome is
(A) α-L-diuronidase
(B) Iduronate sulphatase
(C) Arylsulphatase B
(D) C-acetyl transferase
9. Presence of arginine can be detected by
(A) Sakaguchi reaction
(B) Million-Nasse reaction
(C) Hopkins-Cole reaction
(D) Gas chromatography
10. A nitrogenous base that does not occur
in mRNA is
(A) Cytosine (B) Thymine
(C) Uracil (D) All of these
11. In nucleotides, phosphate is attached to
sugar by
(A) Salt bond (B) Hydrogen bond
(C) Ester bond (D) Glycosidic bond
12. Cyclic AMP can be formed from
(A) AMP (B) ADP
(C) ATP (D) All of these
13. A substituted pyrimidine base of pharmacological
value is
(A) 5-Iododeoxyuridine
(B) Cytisine arabinoside
(C) 5-Fluorouracil
(D) All of these
14 The ‘transforming factor’ discovered by
Avery, McLeod and McCarty was later
found to be
(A) mRNA (B) tRNA
(C) DNA (D) None of these
15. In DNA, the complementary base of
adenine is
(A) Guanine (B) Cytosine
(C) Uracil (D) Thymine
16. In DNA, three hydrogen bonds are
formed between
(A) Adenine and guanine
(B) Adenine and thymine
(C) Guanine and cytosine
(D) Thymine and cytosine
17. Left handed double helix is present in
(A) Z-DNA (B) A-DNA
(C) B-DNA (D) None of these
18. Nuclear DNA is present in combination
with
(A) Histones (B) Non-histones
(C) Both (A) and (B) (D) None of these
19. Number of guanine and cytosine residues
is equal in
(A) mRNA (B) tRNA
(C) DNA (D) None of these
20. Alkalis cannot hydrolyse
(A) mRNA (B) tRNA
(C) rRNA (D) DNA
21. Codons are present in
(A) Template strand of DNA
(B) mRNA
(C) tRNA
(D) rRNA
22. Amino acid is attached to tRNA at
(A) 5’-End (B) 3’-End
(C) Anticodon (D) DHU loop
23. In prokaryotes, the ribosomal subunits
are
(A) 30 S and 40 S (B) 40 S and 50 S
(C) 30 S and 50 S (D) 40 S and 60 S
24. Ribozymes are
(A) Enzymes present in ribosomes
(B) Enzymes which combine the ribosomal
subunits
(C) Enzymes which dissociate
(D) Enzymes made up of RNA
25. The smallest RNA among the following is
(A) rRNA (B) hnRNA
(C) mRNA (D) tRNA
26. The number of adenine and thymine bases
is equal in
(A) DNA (B) mRNA
(C) tRNA (D) rRNA
27. The number of hydrogen bonds between
adenine and thymine in DNA is
(A) One (B) Two
(C) Three (D) Four
28. The complementary base of adenine in
RNA is
(A) Thymine (B) Cystosine
(C) Guanine (D) Uracil
29. Extranuclear DNA is present in
(A) Ribosomes
(B) Endoplasmic reticulum
(C) Lysosomes
(D) Mitochondria
30. Mitochondrial DNA is present in
(A) Bacteria (B) Viruses
(C) Eukaryotes (D) All of these
