Saved Bookmarks
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
DNA polymerase III catalyses `:`A. repair of DNAB. replication of DNAC. translation of m-RNAD. joining of ends of DNA |
| Answer» Correct Answer - B | |
| 52. |
DNA repair in eukaryotes is carried out mainly by `:`A. DNA polymerase `delta`B. DNA polymerase `alpha`C. DNA polymerase `beta`D. DNA polymerase `epsilon` |
| Answer» Correct Answer - D | |
| 53. |
DNA replication in eukaryotes commences `:`A. from centromere to either endB. from one end of chromosome to otherC. from both ends of a chromosome simultaneouslyD. several sites along DNA of a chromosome simultaneously |
| Answer» Correct Answer - D | |
| 54. |
During DNA replication in prokaryotes DNA is anchored to `:`A. ribosomeB. nucleolusC. mesosomeD. chromosome |
| Answer» Correct Answer - C | |
| 55. |
Okazaki fragments are synthesized on `:`A. both leading and laggind strands of DNAB. leading strand of DNA onlyC. lagging strand of DNA onlyD. complementary DNA |
| Answer» Correct Answer - C | |
| 56. |
Okazaki fragments are `:`A. DNA fragments resulted on the lagging strandB. Short DNA fragments on the lagging strandC. Short DNA fragments on the leading strandD. DNA fragments produced due to radiation action |
| Answer» Correct Answer - B | |
| 57. |
Which of the following statements regarding a double - helical molecule of DNA is true ?A. Each strand is identicalB. Each strand replicates itselfC. Bases are perpendicular to the axisD. All hydroxyl groups of pentose are involved in linkages. |
|
Answer» Correct Answer - C In the double helical model of DNA proposed by Watson and Crick, the nitrogenous bases attached to the pentose sugar backbone are perpendicular to the axis and parallel to each other. |
|
| 58. |
Which of the following statements is false ?A. Rotation per bp in Z-DNA is `+36.0^(@)`B. The helical diameter of A-DNA is `23Å`C. There are 12 base - pairs per turn in Z-DNAD. Z-DNA is left-handed whereas A,B and C-DNA are right -handed |
|
Answer» Correct Answer - A Rotation per bp in Z-DNA is `+30.0^(@)`. |
|
| 59. |
Which type of DNA is found in bacteria ?A. Helical DNAB. Straight DNAC. Circular free DNAD. Membrane bound DNA |
| Answer» Correct Answer - C | |
| 60. |
Prokaryotic DNA is `:`A. single stranded straightB. single stranded circularC. double stranded straightD. double stranded circular |
| Answer» Correct Answer - D | |
| 61. |
The following ratio is generally constant for a given species `:`A. `A=C//T+G`B. `G+C//A+T`C. `T+C//G+A`D. `A+G//C+T` |
| Answer» Correct Answer - B | |
| 62. |
Who gave the concept that for a double stranded DNA the ratio between `A=T` and `G=C` are equal and constant ?A. ChargaffB. Watson and CrickC. Wilkins and FranklinD. Wilkins and Chargaff |
| Answer» Correct Answer - A | |
| 63. |
Which is false ?A. `A+G=C+T`B. `A+T=C+G`C. `A//T` is equal to oneD. `C//G` is equal to one |
| Answer» Correct Answer - B | |
| 64. |
Which one is not ture ?A. A=G,T=CB. A=T,G=CC. C=G,T=AD. G=C,A=T |
| Answer» Correct Answer - A | |
| 65. |
Which of the following scientists demonstrated that in DNA, A=T and G=C ?A. Erwin ChargaffB. Frederick GriffithC. Meselson and StahlD. Hershey and Chase |
| Answer» Correct Answer - A | |
| 66. |
The amount of DNA in a diploid cell is `:`A. variable for a give speciesB. same in all species of plantsC. constant fro a given speciesD. same in all species of animals |
| Answer» Correct Answer - C | |
| 67. |
Which of the following processes results in a change of the cellular amount of DNA ?A. BlastulationB. FertilizationC. CytokinesisD. Spore formation |
| Answer» Correct Answer - B | |
| 68. |
DNA is present in `:`A. nucleus onlyB. chloroplast onlyC. mitochondrion onlyD. all of these |
| Answer» Correct Answer - D | |
| 69. |
Transfer of genetic information from one generation to the other is accomplished by `:`A. DNAB. Triplet codonC. Transfer RNAD. Messenger RNA |
| Answer» Correct Answer - A | |
| 70. |
Characters are transferred from parents to offspring through `:`A. RNAB. DNAC. LipidD. Protein |
| Answer» Correct Answer - B | |
| 71. |
Cell division requires that the genetic material be able to `:`A. be replicatedB. undergo rare mutationsC. store informationD. all of these |
| Answer» Correct Answer - A | |
| 72. |
Experiments using `.^(15)N` ( heavy nitrogen ) to confirm the semiconservative replication of DNA were carried out by `:`A. Watson and CrickB. Hershey and ChaseC. Beadle and TatumD. Meselson and Stahl |
| Answer» Correct Answer - D | |
| 73. |
The Experimental Proof Of ReplicationA. Joh CairnsB. Herbert TaylorC. Watson and CrickD. Meselson and Stahl |
| Answer» Correct Answer - C | |
| 74. |
The process of DNA replication is `:`A. dispersiveB. conservativeC. semiconservativeD. nonconservative |
| Answer» Correct Answer - C | |
| 75. |
During DNA replication, the torques are relieved by the enzyme `:`A. DNA ligaseB. DNA polymerase IC. DNA helicaseD. DNA gyrase |
| Answer» Correct Answer - D | |
| 76. |
Nucleosome contains `:`A. only DNAB. only histone proteinC. both DNA and RNAD. both DNA and histone protein |
| Answer» Correct Answer - D | |
| 77. |
Genetic informatiosn are carried in form of long chain of molecules made of `:`A. RNAB. NucleotidesC. Amono acidsD. Polypeptides |
| Answer» Correct Answer - B | |
| 78. |
What is the common point of similarity between DNA and RNA ?A. Both are double strandedB. Both are polymers of nucleotidesC. Both have identical sugar moleculesD. Both have identical pyrimidine bases |
| Answer» Correct Answer - B | |
| 79. |
A molecule to act as a genetic material has the following properties. (i) should be able to replicate (ii) should be structurally more stable (iii) shoulbe be more reactive and labile (iv) shoulde provide scope for slow charnges Choose the correct option `:`A. (i),(ii) and (iii) are correctB. (i),(ii) and (iv) are correct.C. (iii) and (iv) are correct.D. (iii) alone is correct. |
| Answer» Correct Answer - B | |
| 80. |
Assertion (A) : Adenine cannot pair with cytosine. Reason ® `:` Because there wold be two hydrogen atoms in one of the bonding and none at the other.A. Both (A) and (R ) are true and (R ) is the correct explanation of (A )B. Both (A ) and (R ) are true but (R ) is not the correct explanation of (A)C. (A ) is true statement but (R ) is falseD. Both (A ) and (R ) are false |
| Answer» Correct Answer - A | |
| 81. |
A- DNA isA. rarely double strandedB. rarely single strandedC. always single strandedD. always double stranded |
| Answer» Correct Answer - B | |
| 82. |
You are studying a bacterial virus and found its base composition to be `A=22%,T=28%,G=20%` and `C=30%` . What is your conclusion regarding its genetic material ?A. Single stranded RNAB. Double stranded RNAC. Single stranded DNAD. Double stranded DNA |
|
Answer» Correct Answer - C Double-helical DNA would have a base composition in which A=T and G=C. Thid DNA does not, thus virus must not have double -stranded DNA as its genetical material |
|
| 83. |
Nucleotides have a sugar consisting of `:`A. 3 carbon atomsB. 2 carbon atomsC. 6 carbon atomsD. 5 carbon atoms |
| Answer» Correct Answer - D | |
| 84. |
A short length of DNA molecule has 80 thymine and 80 guanine bases. The total number of nucleotides in the DNA fragment is `:`A. 40B. 80C. 160D. 320 |
| Answer» Correct Answer - D | |
| 85. |
In a sample of DNA the base composition (mole ratio) is found to A=40 , T=22,G=21 and C=17 `:`A. DNA is linear duplexB. DNA is circular duplexC. DNA is single strandedD. DNA has high melting point |
| Answer» Correct Answer - C | |
| 86. |
Number of carbon in ring of deoxyribose sugar is `:`A. sixB. fourC. fiveD. three |
| Answer» Correct Answer - C | |
| 87. |
A given double stranded DNA molecule is 10000 base-pairs long. The length of this DNA molecule will be `:`A. `10^(4)` nmB. 10000 nmC. `3.4 xx 10^(4)` nmD. 200000 nm |
| Answer» Correct Answer - C | |
| 88. |
In DNA percentage of thymine is 20, then what is the percentage of guanine ?A. 20B. 30C. 40D. 60 |
| Answer» Correct Answer - B | |
| 89. |
If an isolated strain of DNA is kept at 82- `90^(@)` C , thenA. no effectB. it changes into RNAC. it uncoils and strands separateD. it divides into one million pieces |
| Answer» Correct Answer - C | |
| 90. |
Which of the following is not true for DNA ?A. Direct synthesis of proteinsB. Direct synthesis of DNAC. Direct synthesis of RNAD. None of the above |
| Answer» Correct Answer - A | |
| 91. |
The length of one full turn of DNA is `:`A. `3.4 Å`B. `34.0Å`C. `20.0 Å`D. `3.04 Å` |
| Answer» Correct Answer - B | |
| 92. |
The length of DNA having 23 hase pairs isA. `78 Å`B. `78.4 Å`C. `74.2 Å`D. `74.8 Å` |
| Answer» Correct Answer - C | |
| 93. |
Which of the following is correct pair of pyrimidine basesA. Adenine and thymineB. Adenine and guanineC. Guanine and cytosineD. thymine and cytosine |
| Answer» Correct Answer - D | |
| 94. |
Which of the following sugar is found in nucleic acid ?A. GlucoseB. DextroseC. LevoloseD. Deoxyribose |
| Answer» Correct Answer - D | |
| 95. |
Pentose sugar in nucleic acid was discovered byA. KosselB. FischerC. LeveneD. Chargaff |
| Answer» Correct Answer - C | |
| 96. |
Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by `:`A. base- sugar -OHB. Sugar -phosphateC. base-sugar-phosphateD. (base-sugar-phosphate)n |
| Answer» Correct Answer - C | |
| 97. |
In 3.2 Kbp long piece of DNA, 820 adenine bases were found. What would be the number of cytosine bases ?A. 780B. 740C. 1480D. 1560 |
| Answer» Correct Answer - A | |
| 98. |
Hydrogen bonds between cytosine and guanine are `:`A. 1B. 2C. 3D. 4 |
| Answer» Correct Answer - C | |
| 99. |
In the double helix modle of DNA , how far is each base pair from the next base pairA. 34 nmB. 2.0nmC. 3.4 nmD. 0.34 nm |
| Answer» Correct Answer - D | |
| 100. |
DNA has `:`A. left-handed coiling and parallelB. right -handed coiling and parallelC. left-handed coiling and antiparallelD. right-handed coiling and antiparallel |
| Answer» Correct Answer - D | |