Quiznetik

Biology | Set 27

1. Which is the energy source for the process of elongation ?

Correct : B. GTP

2. What does a gene consist of ?

Correct : D. All the above

3. Name the enzymes needed for lactose Catabolism in E.coli ?

Correct : A. β - galactosidase, permease transacetylase

4. What does operon contain ?

Correct : D. Regulator gene + promotor gene + operator gene + structural gene

5. Select correct match with respect to lac-operon model ?

Correct : A. Active represser + inducer  Inactive repressor

6. In relation of lac operon in E-coli , Which protein is not regulated by the repressor ?

Correct : A. Tryptophan

7. Which is not correct regarding the activity of helicase during DNA replication ?

Correct : C. separates DNA strands

8. Which of the following enzyme is not produced by E. coli during lactose catabolism ?

Correct : C. Lactose dehydrogenase

9. Which is the incorrect statement regarding HGP ?

Correct : A. HGP is an Indian scientific research project

10. Humans have approximately _____ times more genes than E.coli

Correct : D. 50

11. Which of the following is not according to the chargoff’s rule ?

Correct : D. A + T / G + C =1

12. Select the correct answer / answers from the following 1. Ligase :- Joins short segments of DNA together 2. DNA Polymerase :- cuts DNA at specific sequence 3. Helicase :- Breaks the hydrogen bonds between complementary pairs during DNA replication 4. Gyrase : - Joins weak hydrogen bonds between complementary pairs

Correct : C. 1 and 3 are correct, 2 and 4 false

13. DNA replication in eukaryotes is

Correct : B. Bidirectional with many origin

14. Aminoacids lysine, serine and arginine are coded by how many codons ?

Correct : C. 6 codons

15. Which of the following amino acid is coded by 3 codons ?

Correct : D. Isoleucine

16. How many nucleotides make one okazaki segment in eukaryotes ?

Correct : A. 1000-1500

17. Which of the following enzymes help in the process of formation of phosphodiester bond during reverse transcription ?

Correct : D. RNA - dependant DNA polymerase

18. The two strands of a DNA molecule are separted and one of them is analysed for its A + T / G + C ratio, This is found to be 0.2 What is the A + T / G + C ratio of the other strand

Correct : D. 0.2

19. DNA replication in lagging strand of most of the eukaryotic organis ms is

Correct : B. semi conservative but discontinuous

20. How many bases consist in an average gene ?

Correct : B. 3000

21. Match the following using salient features of Human genome project A B (P) Less than 2 % genome (i) 3 billion nucleotide bases (Q) Chromosome 1 (ii) 231 genes (R) Y chromosome (iii) 2968 genes (S) Human genome (iv) codes for protein

Correct : A. (P - iv) (Q - iii) ( R - ii) ( S - i)

22. State the use of moleculer medicine ?

Correct : D. All the above

23. Among the following which is used for separation of DNA fragments ?

Correct : D. Electrophoresis

24. In Which of the following DNA not directly involved ?

Correct : C. Translation

25. Transcription begins when one of the following enzymes binds to promotor site.

Correct : B. RNA polymerase

26. What dose A & B represent ?

Correct : C. Helicase, Single strand binding protein

27. State the process and mention the labelled protion.

Correct : B. process of Transcription - X-RNA Polymerase- Y-DNA Template- Z- RNA Transcript

28. What do P, Q, R and S regions of t RNA ?

Correct : A. P - Anticodon loop

29. Which state is represent by the above model

Correct : A. Repressed state of lac operon

30. What does X replesent in the above diagram

Correct : A. Released polypeptide chain

31. What does ‘X’ represent

Correct : D. Both A & C

32. Write the codon for the anticodon on the t - RNA

Correct : A. AGU

33. In the genetic code dictionary how many codons are used to code for all the 20 essential amino-acids? (AIPMT - 2003)

Correct : B. 64

34. What would happen if in a gene encoding polypeptide of 50 aminoacids 25th codon (UAU) is mutated to UAA ? (AIPMT - 2003)

Correct : A. A Polypeptide of 24 aminoacids will be formed

35. Which one of the following triplet codes, is correctly matched with its specificity for an aminoacid in protein synthesis or as ‘start’ or ‘stop’ codon ?

Correct : D. UAC - Tyrosine

36. What does “Lac” refer to in what we call the lac operon ? (AIPMT - 2003)

Correct : A. Lactose

37. The following ratio is generally constant for a given species (AIPMT - 2004)

Correct : C. G + C / A + T

38. During transcription if the nucleotide sequence of the DNA strand that is being coded is ATACG then the nucleotide sequence in the m RNA would be (AIPMT - 2004)

Correct : C. U A U G C

39. Which one of the following makes use of RNA template to synthesize DNA (AIPMT - 2005)

Correct : C. Reverse transcriptase

40. Protein synthesis is an animal cell occurs (AIPMT - 2005)

Correct : D. on ribosomes present in cytoplasm as well as in mitochondria

41. E coli cells with a mutant z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because (AIPMT - 2005)

Correct : B. they cannot synthesize functional beta galactosidase

42. Aminoacid Sequence in protein synthesis is decided by the sequence of (AIPMT - 2006)

Correct : C. m RNA

43. Antiparallel strands of a DNA molecule means that (AIPMT - 2006)

Correct : D. The phosphate groups at the start of two DNA strands are is opposite position (Pole).

44. Polysome is formed by (AIPMT - 2008)

Correct : C. several ribosomes attached to a single m RNA

45. Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a “triplet” (AIPMT - 2009)

Correct : D. Nirenberg and Mathai

46. Select the two correct statement out of the four statement given below about “ Lac opern”(AIPMT-2010) (i) Glucose or galactose may bind with the repressor and inactivate it (ii) In the absence of lactose the repressor bind with the operator region (iii) The Z -gene codes for permease (iv) This was elucidated by Francois Jacob and Jacques Monod The correct statements are

Correct : C. ii and iv

47. Which one of the following does not follow the central dogma of molecular biology ? (AIPMT - 2010)

Correct : D. HIV

48. The lac opern consists of (AIPMT - 2010)

Correct : C. Two regulatory genes and three structural genes

49. The 31 - 51Phosphodiester linkages inside a potynucleotide chain serve to join AIPMT - 2010)

Correct : C. One nucleotide with another nucleotide

50. Ribosomal RNA is actively synthesized by

Correct : B. nucleolus

51. If one strand of DNA has the nitrogenous base sequence as ATCTG, What would be the complementary RNA strand Sequence (AIPMT - 2012)

Correct : B. UAGAC

52. Semiconservative DNA replication using 15 N was demonstrated by (AIIMS -1994)

Correct : C. Meselson and stahl

53. In operan concept, the operator gene combines with (AIIMS -1986)

Correct : A. Regulator protein to switch off structural gene transcription

54. Termination of polypeptide chain is brought about by

Correct : B. UAA , UAG and UGA

55. RNA that picks up specific aminoacid from amino acid pool of cytoplasm to carry it to ribosome during protein synthesis is

Correct : A. t RNA

56. Correct sequenceof code transfer during polypeptide formation is (AIIMS -1999)

Correct : A. DNA , mRNA , t RNA and amino acids

57. Best method to determine paternity is

Correct : D. DNA finger printing

58. DNA is copied from m-RNA molecule with help of

Correct : B. Reverse transcriptase

59. Nucleotide arrangement in DNA can be seen by

Correct : A. X - ray crystallography

60. Pneumococcus experiment proved that (AFMC - 1993)

Correct : C. DNA is genetic material

61. A DNA nucletotide chain has A G C T T C G A sequence The nucleotide sequence of other chain would be

Correct : A. T C G A A G C T

62. A functional unit in synthesis of protein is (MPPMT - 1994)

Correct : C. Polysome

63. VNTR is employed for (AMU - 2002)

Correct : B. DNA finger printing

64. Out of 64 codons 61 code for 20 types of aminoacids It is due to (CBSE - 2002)

Correct : B. Degeneracy of genetic code

65. Okazaki fragments are joined by enzyme (Kerala 2005)

Correct : B. DNA ligase

66. Heat killed pathogenic cells and live non pathogenic cells are mixed and injected into Mice The result would be (Kerala - 2001)

Correct : A. Mice develop disease and die

67. Generally Cockroach is .......... or .......... colored insect, however in tropical regions, they havebeen reported to be .........., .......... and .......... colored.

Correct : B. Brown or Black, Yellow, Red and Green

68. In case of common species of Cockroach, Morphologically which statement is correct ?

Correct : D. The size of male is slightly bigger than female.

69. Head of the Cockroach is formed by the fusion of .......... segments.

Correct : C. two

70. Why head of the Cockroach can move easily in all the directions ?

Correct : A. In Cockroach head and thorax fuse to form Cephalothorax.

71. On the head region of Cockroach .......... pairs of .......... and .......... shaped eyes occur.

Correct : A. One pair, sessile compound and kidney shaped

72. Mouthparts of periplaneta are consist of ..........different types of articulations.

Correct : C. six

73. On the lateral side of alimentary canal of cockroach .......... glands are found.

Correct : B. Salivary

74. Each walking leg of periplaneta is made up of ..........segments.

Correct : A. five

75. A segment attached to the ventral side of the thorax nearer to the body of Cockroach is .......... .

Correct : C. Coxa

76. Walking legs of periplaneta are attached to .......... and divided into .......... segments.

Correct : B. Ventral sternum, Five

77. Third segment of walking leg of Cockroach is.......... .

Correct : C. Femur

78. Fifthe segment of walking leg of Cockroach is .......... .

Correct : B. Tarsus

79. What is the name of second segment of walking leg of Cockroach ?

Correct : D. Trochanter

80. Each abdominal segment of Ccokroach are covered with .......... outer layers .......... plearae.

Correct : C. Two, One

81. Howmany segment are present in an abdomen of the Cockroach ?

Correct : B. Ten

82. In Cockroach which tergum possesses a median groove ?

Correct : A. Tenth

83. Which is the peculiarity of ninenth sternum of maleCockroach ?

Correct : B. A piar of anal cerci is associated with it

84. Which number of sternum is boatshaped in the Cockroach ?

Correct : C. Seventh

85. In Cockroach which segment has female genital opening ?

Correct : D. Eighth

86. Which segment has male genital opening is Cockroach ?

Correct : A. Ninth

87. Which structure is sound receptor in Cockroach ?

Correct : B. Anal cerci

88. Which segments joint to form a genital pouch in female Cockroach ?

Correct : C. Eighth and Nineth

89. The distal segment of walking leg of a Cockroach is .......... ?

Correct : D. Tarsus

90. In which succession the three main layers of the body wall of a Cockroach from outer to Inner side are arraged ?

Correct : B. Cuticle, Epidermis and basement membrane

91. The Epidermis of body wall of the Cockroach is made up of.......... ?

Correct : C. Columnar epithelium

92. In Cockroach how many stuctures named after malpighian are present ?

Correct : B. Two

93. In Cockroach the cavities of foregut and hindgut are lined with .......... .

Correct : C. Cuticle

94. In the alimentary canal of Cockroach the shape of region following the mouth is .......... .

Correct : C. Norrow tubula

95. How many secreting lobes are present in each salivary gland of Cockroach ?

Correct : A. Two

96. In Cockroch .......... on salivary glands and .......... reservoirs are present ?

Correct : C. Two, Four

97. Crop of the Cockroach occurs at .......... in almentary canal.

Correct : A. Posterior end of oesophagu

98. In which of the following regions crop of the Cockroach is located ?

Correct : C. Thorax and abdomen

99. In Cockroach, gizzard is .......... organ and .......... occur inside it.

Correct : B. Muscular, six chitinous teeth

100. Where are sieve like structures present in the alimentary canal of Cockroach ?

Correct : D. Posterior end of gizzard