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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.
| 701. |
For transformation, micro- particales coated with DNA to be bombarded with ghene gun are made up ofA. Silver or PlatinumB. Platinum or ZincC. Silicon or PlatinumD. Gold or Tungsten |
| Answer» Correct Answer - d | |
| 702. |
what is antisense technologyA. When a piece of RNA that is complementary in sequence is used to stop expression of a specific geneB. RNA polymerase producing DNAC. A cell displaying a foreion antigens used for synthesis of antigensD. Production of somaclonal variants in tissue cultures |
| Answer» Correct Answer - a | |
| 703. |
Antisense technology isA. Use of complementary RNA to stop expression of specific geneB. RNA polymerse producing DNAC. A cell with foreign antigen used for synthesis of antigensD. Production of somaclonal variants in tissue culture |
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Answer» Correct Answer - A Antisence technology is use of complementary RNA to stop expression of specific gene. |
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| 704. |
Whose experiments cracked DNA and discovered triolet nature of genetic code ?A. Beadle and TatumB. Hershey and ChaseC. Morgan and SturtevantD. Nirenberg and Matthaei |
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Answer» Correct Answer - D Nitrenberg and Matthaei cracked DNA and discovered triplet nature of genetic code. |
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| 705. |
What is not true for genetic code ?A. It is degenerateB. It is nearly universalC. A code in mRNA is real in a non-contiguous fashionD. It is unambiguous |
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Answer» Correct Answer - C A code in mRNA is read in a contiguous fashion. |
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| 706. |
Removal of introns and joining the exons in a defined order in a transcription unit isA. SplicingB. CappingC. TailingD. Transformation |
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Answer» Correct Answer - A Remooval of introns and joining the exons in a transcription unit is splicing. |
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| 707. |
Operon isA. Sequence of three nitrogen bases determining single amino acidB. A set of closely placed gened regulating a metabolic pathway in prokaryotesC. Segment of DNA specifying a polypeptideD. Gene responsible for switching on and switching off of other genes |
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Answer» Correct Answer - B Operon is a set of closely placed genes regulating a metabolic pathway in prokaryotes. |
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| 708. |
if a bacteriophage having `S^(35)` infects a bacterium growing on normal medium, the bacteriophages produced after the death of bacterium willA. incorporate `S^(35)` into their nucleic acidB. incorporate `S^(35)` into their particlesC. not incorporate `S^(35)` into their particlesD. incorporate `S^(35)` into their protein coat as protein is genetic |
| Answer» Correct Answer - C | |
| 709. |
if it is wanted to have `T_(2)` bacteriophages with protein cover labelledwith `.^(35)S`, it is desirable toA. grow bacteriophages in medium containing `.^(35)S` labelled amino acidsB. introduce `T_(2)` in bacterium having `.^(35)S` labelled proteinC. obtain a single phage with `.^(35)S` labelled protein and allow it to multiplyD. all are correct |
| Answer» Correct Answer - B | |
| 710. |
A unit lac-operon which in the absence of lactose, suppresses the activity of operator gene isA. Structural geneB. Regulatory geneC. Repressor proteinD. Promoter gene |
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Answer» Correct Answer - B A unit lac-operon which in the absence of lactose suppresses the activity of operator gene is regulatory gene. |
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| 711. |
What is not true for genetic code :-A. It is degerateB. It is unambiguousC. A codon in mRNA is read in a non-contiguous fashionD. it is nearly universal |
| Answer» Correct Answer - C | |
| 712. |
Write the full form of VNTR. How is VNTR different from probe? |
| Answer» VNTR stands for variable number of tandem repeats. | |
| 713. |
(a) What is a genetic code ? |
| Answer» The sequences of base triplets in DNA molecule. | |
| 714. |
Name three nonsense codons. |
| Answer» Correct Answer - UAA, UAG and UGA . | |
| 715. |
Dr. Hargovind Khorana deuced the code for which of the following amino acidsA. Serine and leucineB. Leucine and isoleucineC. Valine and glutamic acidD. Phenylalanine and methionine |
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Answer» Correct Answer - A Hargobind Khorana deduced code for amino acid serine and leucine. |
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| 716. |
Hargovind Khorana is known forA. Discovery of DNAB. Discovery of DNA ligaseC. Discovery of tRNAD. Synthesis of proteins |
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Answer» Correct Answer - B Hargobind Khorana is known for discovery of DNA ligase. |
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| 717. |
During translation , activated amino acids get linked to tRNA. This process is commonly called asA. charging of tRNAB. discharging of tRNAC. aminocylation of tRNAD. |
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Answer» Correct Answer - d |
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| 718. |
What does the following equation denote? Amino acid + ATP `rarr` Aminoacyl AMP + PPA. Chain terminationB. Activation of amino acidsC. Elongation of chainD. None of the above |
| Answer» Correct Answer - B | |
| 719. |
Which amino acid is specified by genetic codes ACU, ACC, ACA, ACG showing degeneracy ?A. LeucineB. MethionineC. GlycineD. Threonine |
| Answer» Correct Answer - D | |
| 720. |
Which one of the following sequence represents m-RNA coded from a DNA segment with base pairs as `:` GA GC GC ACA CT CG CG TGTA. GAGCGCACAB. CUCCGCUGUC. CTCGCGTGTD. CUCCGCUCC |
| Answer» Correct Answer - a | |
| 721. |
Describe the structure of a RNA polynucleotide chain having four different types of nucleotides. |
| Answer» A RNA nucleotide has three main components-a nitrogenous base, a ribose sugar and a phosphate group. 1. The ribose sugar and the phosphates form the backbone of a polynucleotide chain with nitrogenous base linked to sugar moiety and projecting from the backbone. | |
| 722. |
A molecule that can act as a genetic material must fulfill the traits given below, exceptA. It should be unstable structurally and chemicallyB. It should provide the scope for slow changes that are required for evolutionC. It should be able to express itself in the from of Mendelian for charactersD. It should be able to generate its replica |
| Answer» Correct Answer - A | |
| 723. |
What are histones? What are their functions? |
| Answer» Histones are a set of positively charged basic proteins associated with DNA helix. | |
| 724. |
Given below is the presentation of a kind of chromosomal mutation : What is the kind of mutation represented A. deletionB. duplicationC. inversionD. reciprocal translocation |
| Answer» Correct Answer - C | |
| 725. |
In DNA, guanine and cytosine are bonded with how many hydrogen bonds ? (a) 1 (b) 2 (c) 3 (d) 4 |
| Answer» Correct Answer - (c) | |
| 726. |
Why does cytosine make pair with guanine and not with adenine ?A. Polar natural of C and AB. `C-A` pair would not reach across the double helixC. `C-A` pair would be wider than doubleD. Hydrogen bond forming functional groups are not complementary between C and A |
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Answer» Correct Answer - D Cytosine make pair with guanine and not with adenine because hydrogen bond forming functional groups are not complementary between C and A. |
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| 727. |
In DNA helix, cytosine is paired with guanine byA. covalent bondB. phosphate bondC. three hydrogen bondsD. two hydrogen bonds |
| Answer» Correct Answer - C | |
| 728. |
Assertion. During DNA replication, the discontinuous synthesized fragments are joined by DNA polymerase. Reason. A RNA sequence provides binding site for RNA polymerase.A. If both A and R are true and R is the correct explanation of A.B. If both A and R are true but R is not the correct explanation of A.C. If A is true but R is false.D. If both A and R are false. |
| Answer» Correct Answer - D | |
| 729. |
During transcription holoenzyme RNA polymerase binds to a DNA sequence and the DNA assumes a saddle like structure at that point. What is that sequence called ?A. AATIB. CACCC. TATAD. TTAA |
| Answer» Correct Answer - C | |
| 730. |
The enzyme DNA polymerase was discovered byA. KornbergB. OkazakiC. Watson and CrickD. Jacob and Monod |
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Answer» Correct Answer - a a) DNA polymerase was discovered by kornberg and his colleagues in 1955. |
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| 731. |
The reverse transcriptase is also calledA. RNA dependent DNA polymeraseB. DNA dependent RNA polymeraseC. DNA primaseD. None of these |
| Answer» Correct Answer - A | |
| 732. |
Protein for virus protein coat is synthesized inA. Ribosome of virusB. Ribosome of hostC. Mitochondria of hostD. Nucleus of host |
| Answer» Correct Answer - B | |
| 733. |
In lysogeny a virus isA. temperate but is capable of virulenceB. virulentC. completely harmless to hostD. multiplies rapidly |
| Answer» Correct Answer - A | |
| 734. |
Prophage isA. stage of meiosisB. integrated viral genome with host chromosomeC. inactive virus outside the living cellD. none of the above |
| Answer» Correct Answer - B | |
| 735. |
Oncogenic viruses are harmful and can cause tumor inA. provirus stateB. lytic phaseC. virion stateD. hybrid state |
| Answer» Correct Answer - A | |
| 736. |
During protein synthesis in an organism at one point the process comes to a halt. Select the group of the three codons from the following, from which anyone of the three could bring about this halt `:`A. UUU, UCC, UAUB. UUC, UUA, UACC. UAG, UGA, UAAD. UUG, UCA, UCG |
| Answer» Correct Answer - C | |
| 737. |
The genes are responsible for growth and differentiation in an organism through regualtion ofA. TranslocationB. TransformationC. Translation and translationD. Translation and translation |
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Answer» Correct Answer - d d) By the process of translation and transcription proteins are formed, which are responsible for growth and differentiation. |
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| 738. |
Assertion : DNA polymerase -I acts as proofreader. Reason : DNA polymerase-I removes mismatched nucleotides.A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion.B. If both the assertion and reason are true but the reason is not a correct explanation of the assetionC. If the assertion is true but the reason is falseD. If the both the assertion and reason are false |
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Answer» Correct Answer - a a) DNA polymerase I can also remove thymine dimers produced due to UV irradiation and fill the gap due to exicision. The newly formed segment is sealed by DNA ligase. |
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| 739. |
Assertion :rRNA is a constituent of ribosomes. Reason : rRNA is a constituent of ribosomes.A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion.B. If both the assertion and reason are true but the reason is not a correct explanation of the assetionC. If the assertion is true but the reason is falseD. If the both the assertion and reason are false |
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Answer» Correct Answer - b b) The amount of rRNA is 70-80% of total RNA. It is a constituent of ribosomes. RNAs of eukaryotes are of four types - 28s, 18 S, 5.8S and 5S. Prokaryotic ribosomes have three type of RNAs - 23S, 16 S and 5S. |
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| 740. |
What is the criterion for DNA fragment movement on agarose gel during gel electrophoesisA. the larger the fragment size, the farther it movesB. The smaller the fragment size, the farther it movesC. Positive charged fragment moves to farther endD. Negatively charged fragments do not move |
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Answer» Correct Answer - b b) During electrophoresis, DNA is filtered through pores, based on size. It moves towards anode. |
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| 741. |
Match list I and II and select the answer using the code given below the lists.A. 1,2 and 3 are correctB. 1 and 2 are correct, 3 is falseC. 1 is correct, 2 and 3 are falseD. 1 and 3 are correct, 2 is false |
| Answer» Correct Answer - a | |
| 742. |
Match the names of the scientists with their contributions and choose the correct answer A. A-2, B-1, C-4, D-3, E-5B. A-3, B-4, C-1, D-2, E-5C. A-1, B-3, C-2, D-4, E-5D. A-4, B-3, C-2, D-1, E-5 |
| Answer» Correct Answer - b | |
| 743. |
The net electric charge on DNA and histones isA. both positiveB. both negativeC. negative and positive, respectivelyD. zero |
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Answer» Correct Answer - c |
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| 744. |
The net electric charge on DNA and histones isA. Both positiveB. Both negativeC. Negative and positive respectivelyD. zero |
| Answer» Correct Answer - c | |
| 745. |
A triplet codon means `:`A. A sequence of three nitrogen bases on mRNAB. A sequence of three nitrogen bases in tRNAC. A sequence of three bases in rRNAD. The presence of only three bases in mRNA |
| Answer» Correct Answer - a | |
| 746. |
Barr body in mammals representA. One of the two X chromosomes in somatic cells of femalesB. All heterochmatin of male and female cellsC. Y chromosomes of maleD. All heterochromatin of female cells |
| Answer» Correct Answer - A | |
| 747. |
All of the following are part of an operon expectA. an operatorB. structural genesC. an enhancerD. a promoter |
| Answer» Correct Answer - C | |
| 748. |
All of the following are part of an operon expectA. An operatorB. Structural genesC. An enthancerD. A prometer |
| Answer» Correct Answer - c | |
| 749. |
The process by which DNA of nucleus passes genetci information of m RNA OR Which is transfer of DNA to RNA calledA. TranlocationB. TranscriptionC. TranslationD. Transportation |
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Answer» Correct Answer - b b) Transcription is the formation of RNA over the template of DNA. It creates single stranded RNA which has a coded information similar to the sense or coding strand of DNA with the exception that T is replaced by U. |
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| 750. |
Information transfer from RNA to DNA is `:`A. TranscriptionB. TransilationC. ReplicationD. Reverse transcription |
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Answer» Correct Answer - D Information transfer from RNA to DNA is reverse transcription. |
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