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NUCLEIC ACIDS- Part 18
See all quizzes of NUCLEIC ACIDS- Part 18 here:
1 From DNA the genetic message is transcribed
into this compound:
(A) Protein (B) mRNA
(C) tRNA (D) rRNA
2. This compound has a double helical
structure.
(A) Deoxyribonucleic acid
(B) RNA
(C) Flavine-adevine dinucleotide
(D) Nicotinamide adamine dinucleotide
3. The structural stability of the double helix
of DNA is as cribbed largely to
(A) Hydrogen bonding between adjacent purine
bases
(B) Hydrophobic bonding between staked purine
and pyrinuidine nuclei
(C) Hydrogen bonding between adjacent
pyrimidine bases
(E) Hydrogen bonding between purine and
pyrimidine bases
4. Which of the following statements about
nucleic acid is most correct?
(A) Both pentose nucleic acid and deoxypentose
nucleic acid contain the same pyrimidines
(B) Both pentose nucleic acid and deoxypentose
nucleic acid and deoxypentose nucleic acid
Contain the same purines
(C) RNA contains cytosine and thymine
(D) DNA and RNA are hydrolysed by weak alkali
5. Acid hydrolysis of ribonucleic acid would
yield the following major products:
(A) d- deoxyribose, cytosine, adenine
(B) d-ribose, thymine, Guanine
(C) d-ribose, cytosine, uracil, thymine
(D) d-ribose, uracil, adenine, guanine, cytosine
6. RNA does not contain
(A) adenine (B) OH methyl cytosine
(C) d-ribose (D) Uracil
7. Which of the following statements is
correct?
(A) a nucleo protein usually contain deoxy sugars
of the hexose type
(B) Nucleoproteins are usually absent from the
cytoplasm
(C) Nucleoproteins usually are present in the
nucleus only
(D) Nucleoproteins usually occur in the nucleus
and cytoplasm
8. Whcih of the following compound is
present in RNA but absent from DNA?
(A) Thymine (B) Cytosine
(C) Uracil (D) Guanine
9. Nucleic acids can be detected by means
of their absorption maxima near 260 nm.
Their absorption in this range is due to
(A) Proteins
(B) Purines and pyrimidines
(C) Ribose
(D) Deoxyribose
10. Which of the following contains a deoxy
sugar?
(A) RNA (B) DNA
(C) ATP (D) UTP
11. DNA is
(A) Usually present in tissues as a nucleo protein
and cannot be separated from its protein
component
(B) A long chain polymer in which the
internucleotide linkages are of the diester type
between C-3’ and C-5’
(C) Different from RNA since in the latter the
internucleotide linkages are between C-2’ and
C-5’
(D) Hydrolyzed by weal alkali (pH9 to 100°C)
12. Nobody is the name given to
(A) Ribosome (B) Microsome
(C) Centrosome (D) Nucleosome
13. Transcription is the formation of
(A) DNA from a parent DNA
(B) mRNA from a parent mRNA
(C) pre mRNA from DNA
(D) protein through mRNA
14. Translation is the formation of
(A) DNA from DNA
(B) mRNA from DNA
(C) Protein through mRNA
(D) mRNA from pre mRNA
15. Sigma and Rho factors are required for
(A) Replication (B) Transcription
(C) Translation (D) Polymerisation
16. The genine of φ×174 bacteriophage is
interesting in that if contains
(A) No DNA
(B) DNA with uracil
(C) Single stranded DNA
(D) Triple standard DNA
17. Okasaki fragments are small bits of
(A) RNA
(B) DNA
(C) DNA with RNA heads
(D) RNA with DNA heads
NUCLEIC ACIDS 269
18. In addition to the DNA of nucleus there
DNA is
(A) Mitochondrian
(B) Endoplasmic reticulum
(C) Golgi apparatus
(D) Plasma membrane
19. The mitochondrial DNA is
(A) Like the nuclear DNA in structure
(B) Single stranded, linear
(C) Double stranded, circular
(D) Single stranded, circular
20. A synthetic RNA having the sequence of
UUUUUU (Poly U) will give a protein
having poly ______.
(A) Alamine (B) Phenyl alanine
(C) Glycine (D) Methionine
21. Lac operon of E. coli contains _______ is
continuity.
(A) Regulator and operator genes only
(B) Operator and structural genes only
(C) Regular and structural genes only
(D) Regulator, operator and structural genes
22. A mRNA of eukaryotes can code for
(A) Only one polypeptide
(B) Two polypeptides
(C) Three polypeptides
(D) Five polypeptides
23. mRNA of prokaryotes can code for
(A) More than one polypeptide
(B) Only one polypeptide
(C) Many exons and introns
(D) Introns only
24. DNA directed RNA polymerase is
(A) Replicase
(B) Transcriptase
(C) Reverse transcriptase
(D) Polymerase III
25. RNA directed DNA polymerase is
(A) Replicase
(B) Transcriptase
(C) Reversetranscriptase
(D) Polymerase–III
26. RNA synthesis requires
(A) RNA primer (B) RNA template
(C) DNA template (D) DNA primer
27. The mRNA ready for protein synthesis has
the ________ cap.
(A) ATP (B) CTP
(C) GTP (D) UTP
28. mRNA ready for protein synthesis has the
poly _______ toil.
(A) G (B) A
(C) U (D) C
29. The codon for phenyl Alanine is
(A) AAA (B) CCC
(C) GGG (D) UUU
30. Blue print for genetic information residues
in
(A) mRNA (B) tRNA
(C) rRNA (D) DNA
