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NUCLEIC ACIDS- Part 1
See all quizzes of NUCLEIC ACIDS- Part 1 here:
1. A nucleoside consists of
(A) Nitrogenous base
(B) Purine or pyrimidine base + sugar
(C) Purine or pyrimidine base + phosphorous
(D) Purine + pyrimidine base + sugar +
phosphorous
2. A nucleotide consists of
(A) A nitrogenous base like choline
(B) Purine + pyrimidine base + sugar +
phosphorous
(C) Purine or pyrimidine base + sugar
(D) Purine or pyrimidine base + phosphorous
3. A purine nucleotide is
(A) AMP (B) UMP
(C) CMP (D) TMP
4. A pyrimidine nucleotide is
(A) GMP (B) AMP
(C) CMP (D) IMP
5. Adenine is
(A) 6-Amino purine
(B) 2-Amino-6-oxypurine
(C) 2-Oxy-4-aminopyrimidine
(D) 2, 4-Dioxypyrimidine
6. 2, 4-Dioxypyrimidine is
(A) Thymine (B) Cystosine
(C) Uracil (D) Guanine
CHAPTER 9
NUCLEIC ACIDS
7. The chemical name of guanine is
(A) 2,4-Dioxy-5-methylpyrimidine
(B) 2-Amino-6-oxypurine
(C) 2-Oxy-4-aminopyrimidine
(D) 2, 4-Dioxypyrimidine
8. Nucleotides and nucleic acids concentration
are often also expressed in terms of
(A) ng (B) mg
(C) meq (D) OD at 260 nm
9. The pyrimidine nucleotide acting as the
high energy intermediate is
(A) ATP (B) UTP
(C) UDPG (D) CMP
10. The carbon of the pentose in ester linkage
with the phosphate in a nucleotide structure
is
(A) C1 (B) C3
(C) C4 (D) C5
11. Uracil and ribose form
(A) Uridine (B) Cytidine
(C) Guanosine (D) Adenosine
12. The most abundant free nucleotide in
mammalian cells is
(A) ATP (B) NAD
(C) GTP (D) FAD
236 MCQs IN BIOCHEMISTRY
13. The mean intracellular concentration of
ATP in mammalian cell is about
(A) 1 mM (B) 2 mM
(C) 0.1 mM (D) 0.2 mM
14. The nucleic acid base found in mRNA but
not in DNA is
(A) Adenine (B) Cytosine
(C) Guanine (D) Uracil
15. In RNA moleule ‘Caps’
(A) Allow tRNA to be processed
(B) Are unique to eukaryotic mRNA
(C) Occur at the 3’ end of tRNA
(D) Allow correct translation of prokaryotic mRNA
16. In contrast to eukaryotic mRNA,
prokaryotic mRNA
(A) Can be polycistronic
(B) Is synthesized with introns
(C) Can only be monocistronic
(D) Has a poly A tail
17. The size of small stable RNA ranges from
(A) 0–40 nucleotides
(B) 40–80 nucleotides
(C) 90–300 nucleotides
(D) More than 320 nucleotides
18. The number of small stable RNAs per cell
ranges from
(A) 10–50,000
(B) 50,000–1,00,000
(C) 1,00,000–10,00,000
(D) More than 10 lakhs
19. Molecular weight of heterogenous nuclear
RNA (hnRNA) is
(A) More than 107 (B) 105 to 106
(C) 104 to 105 (D) Less than 104
20. In RNA molecule guanine content does not
necessarily equal its cytosine content nor
does its adenine content necessarily equal
its uracil content since it is a
(A) Single strand molecule
(B) Double stranded molecule
(C) Double stranded helical molecule
(D) Polymer of purine and pyrimidine ribonucleotides
21. The nitrogenous base present in the RNA
molecule is
(A) Thymine (B) Uracil
(C) Xanthine (D) Hypoxanthine
22. RNA does not contain
(A) Uracil (B) Adenine
(C) Thymine (D) Ribose
23. The sugar moiety present in RNA is
(A) Ribulose (B) Arabinose
(C) Ribose (D) Deoxyribose
24. In RNA molecule
(A) Guanine content equals cytosine
(B) Adenine content equals uracil
(C) Adenine content equals guanine
(D) Guanine content does not necessarily equal
its cytosine content.
25. Methylated purines and pyrimidines are
characteristically present in
(A) mRNA (B) hnRNA
(C) tRNA (D) rRNA
26. Thymine is present in
(A) tRNA (B) Ribosomal RNA
(C) Mammalian mRNA(D) Prokaryotic mRNA
27. The approximate number of nucleotides
in tRNA molecule is
(A) 25 (B) 50
(C) 75 (D) 100
28. In every cell, the number of tRNA molecules
is at least
(A) 10 (B) 20
(C) 30 (D) 40
29. The structure of tRNA appears like a
(A) Helix (B) Hair pin
(C) Clover leaf (D) Coil
30. Although each specific tRNA differs from the
others in its sequence of nucleotides, all tRNA
molecules contain a base paired stem that
terminates in the sequence CCA at
(A) 3′ Termini (B)5′ Termini
(C) Anticodon arm (D) 3′5′ -Termini
