12th class (Fsc) Biology unit 6 MCQs
26. The strand which elongates towards the replication fork is:
a. Okazaki
b. Leading
c. Primer
d. Lagging
27. mRNA is synthesized by:
a. RNA ligase
b. DNA polymerase
c. None of these
d. RNA polymerase
28. Enzymes are responsible for assembly of:
a. Carbohydrates
b. Nucleic acid
c. Protein
d. All of these
29. In bacteria the newly synthesized mRNA is released in:
a. Nucleus
b. Cytoplasm
c. Mitochondria
d. Both B & C
30. In 1953 F.Sanger described the sequence of amino acid of:
a. Insulin
b. Myoglobin
c. Globulin
d. Keratin
31. A strand of DNA, which is transcribed is called:
a. Antisense
b. Coding strand
c. Conservative strand
d. Sense strand
32. Human cells contain types of tRNA molecules:
a. 195
b. 20
c. 300
d. 45
33. RNA polymerase II synthesize:
a. rRNA
b. mRNA
c. cDNA
d. tRNA
34. he copping of mRNA from DNA is called:
a. Transformation
b. Translation
c. Transcription
d. Transduction
35. Anti codes present on:
a. DNA
b. mRNA
c. rRNA
d. tRNA
36. Amino acid attachment sit of tRNA is:
a. 3’-end
b. G-end
c. 5’-end
d. 2’-end
37. DNA polymerase only adds nucleotides to the end:
a. 2’-end
b. 5’-end
c. 4’-end
d. 3’-end
38. Which of the following polymerase synthesize tRNA?
a. RNA polymerase-III
b. RNA polymerase-I
c. DNA polymerase
d. RNA polymerase-II
39. Strand of DNA which is not transcribed is called as:
a. Coding strand
b. Template
c. Lagging strand
d. Antisense
40. Which of the following is a non-sense codon?
a. AUG
b. UGA
c. AUC
d. UGG
41. Which of the following are nonsense codons?
a. CUA
b. AUG
c. UAA
d. All of these
42. Which of the following is a “Start” condon?
a. UAG
b. AUG
c. UGA
d. UAA
43. Every gene stars with initiation codon AUG which encodes for the amino acid:
a. Proline
b. Lysine
c. Methionic
d. Serine
44. One of the given does not code for any amino acid:
a. GAU
b. AUG
c. UAA
d. ACU
45. A combination of three nucleotides of DNA that specifies an amino Bacid is called:
a. Entron
b. Ciston
c. Genetic code
d. Anticodon
46. Which one of the following is initiation codon:
a. UGA
b. AUG
c. GAC
d. GUA
47. This condition appears as a result of point mutation:
a. Klinefelter syndrome
b. Down syndrome
c. Sicket cell anemia
d. Turner syndrome
48. In sickle cell anemia code for glutamic acid is replaced by:
a. Valine
b. Leucine
c. Proline
d. Histidine
49. If the alternations involve only one or a few base pairs in the coding sequence they are called:
a. Deletion
b. Mutation
c. Inversion
d. Point mutation
50. In sickle cell anemia disease a single thymine is replaced with an adenine in the DNA that codes replaced with an adenine in the DNA that codes for:
a. Glycine
b. Valine
c. Glutamic Acid
d. Histidine
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