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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.
| 201. |
Match the following A. A-R, B-S, C-P, D-QB. A-Q, B-S, C-P, D-RC. A-Q, B-P, C-S, D-RD. A-S, B=P, C-Q, D-R |
| Answer» Correct Answer - b | |
| 202. |
Nucleotide arrangement in DNA can be seen byA. X- ray crystallographyB. Electron microscopeC. UltracentrifugeD. Light microscope |
| Answer» Correct Answer - a | |
| 203. |
The two polynucleotide chains in DNA areA. ParallelB. DiscontiuousC. AntiparallelD. Semiconservative |
| Answer» Correct Answer - c | |
| 204. |
The two polynucleotide chains in DNA areA. DiscontinuousB. AntiparallelC. SemiconservativeD. Parallel |
| Answer» Correct Answer - B | |
| 205. |
DNA gyrase is a type ofA. DNA topoisomeraseB. DNA ligaseC. DNA polymeraseD. Reverse transcriptase |
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Answer» Correct Answer - A DNA gyrase is a type of DNA topoisomerase. |
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| 206. |
Assertion. Adenine cannot pair with cytosine. Reason. Adenine and cytosine do not have a perfect match between hydrogen donor and hydrogen acceptor sites. Hence, they cannot pair.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 - A | |
| 207. |
Assertion : Deoxyribonucleoside triphosphate act as substrates and also provides energy for polymerisation. Reason : Deoxyribonucleoside triphosphate act as substrates and also provides energy for polymerisation.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - A `**` Deoxyribonucleoside triphosphates sreve dual purposes. `**` In addition to acting as substrates, they provide energy for polymerisation reaction (the two terminal phosphates in a deoxynucleoside triphosphates are high-energy phosphates, same as in case of (ATP). |
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| 208. |
Break throught if the year 2002A. cDNAB. 16 SrRNAC. rDNAD. miRNA |
| Answer» Correct Answer - d | |
| 209. |
Okazaki segments are formed during or DNA multiplication is calledA. TransductionB. TranscriptionC. ReplicationD. Translation |
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Answer» Correct Answer - C Okazaki segments are formed during replication. |
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| 210. |
DNA duplication or multiplication in known asA. ReplicationB. TranscriptionC. TransductionD. Translation |
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Answer» Correct Answer - A DNA duplication or multiplication is known as replication. |
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| 211. |
DNA fingerprinting requiresA. Restriction endonucleaseB. Taq polymeraseC. Oligonucleotide PrimersD. All of the above |
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Answer» Correct Answer - D DNA finger printing requires restriction endonuclease, taq polymerase and oligonucleotide Primers. |
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| 212. |
Select the correct statement regarding the human genome projectA. Y-chromosome has maximum number of genesB. There are 3164.7 million genes in human bodyC. The average gene consists of 3000 bases.D. Repeated sequence make up very small portion of human genome. |
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Answer» Correct Answer - C Y chromosome has minimum no. of genes (231) while chromosome no. 1 has maximum no. of genes (2968). There are 3164.7 million nucleotides bases and not base pairs. |
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| 213. |
Telomerase is an enzyme which is aA. repetitive DNAB. RNAC. simple proteinD. ribonucleoprotein |
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Answer» Correct Answer - D Ends of an eukaryotic chromosome are known as telomeres. Telomerase , which is a special ribonucleoprotein molecule (enzymatic in nature) is responsible for the synthesis of these telcomeres. |
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| 214. |
Which of the following blotting methods involves the transferring of proteins from a gel to membranes, then probiing them using antibodies to specific protein?A. northerm blottingB. southern blottingC. western blottingD. eastern blotting |
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Answer» Correct Answer - C Eastern blotting does not stand for any procedure. |
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| 215. |
During transcription, DNA site at which RNA polymerase binds is calledA. PromoterB. ReceptorC. RegulatorD. Enhancer |
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Answer» Correct Answer - A During transciption, DNA site at which RNA polymerase binds is called promoter. |
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| 216. |
One of the following is true with respect to AUG.A. It codes for methionine onlyB. It is also an initiation codonC. It codes for methionine in both prokary- otes and eukaryotesD. All of the above |
| Answer» Correct Answer - d | |
| 217. |
One of the following is true with respect to AUGA. it codes for methionine onlyB. it is also an initiation codonC. It codes for methionine in both prokaryotes and eukaryotesD. all of the above |
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Answer» Correct Answer - d |
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| 218. |
Genetic material fo reovirus isA. ds DNAB. ss DNAC. ds RNAD. ss RNA |
| Answer» Correct Answer - C | |
| 219. |
Nucleotide arrangement in DNA can be seen byA. X - ray crystallographyB. electron microsecopeC. ultracentrifugeD. light microscope |
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Answer» Correct Answer - A Astbury by his X- ray diffraction studies suggested 3- D configuration for DNA molecules which was confirmed by Wilkins and Franklin in 1952 and then in 1953 Waston and Crick designed the model of DNA molecule. |
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| 220. |
Which is not directly involved in protein synthesis ?A. TranscriptionB. InitiationC. ElongationD. Termination |
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Answer» Correct Answer - A Transcription is the synthesis of RNA on DNA template . It is not involved in protein synthesis (translation0. |
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| 221. |
DNA is not directly involved with the synthesis of the followingA. `m- RNA`B. `r- RNA`C. `t -RNA`D. Protein |
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Answer» Correct Answer - d d) DNA does not move to the site of protein synthesis to directly guide the process. Instead it transfers its information to mRNA molecules which move to the ribosomes to direct protein synthesis. |
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| 222. |
Transcription unitA. Starts at initiator region and end at stop region starts at operator region and ends at telomeric endB. Starts at promoter region and ends at terminator regionC. Starts at CAA box and ends at TATA boxD. |
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Answer» Correct Answer - C Transcription starts at promoter region & ends at terminator region. |
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| 223. |
Who proposed that genes control production of enzymes ?A. R. d. KornbergB. Beadle and TatumC. A.E. GarrodD. T.H. Morgan |
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Answer» Correct Answer - B Beadle and Tatum proposed that genes control production of enzymes. |
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| 224. |
An anticodon of t-RNA can recognize more than one codon of m-RNA . It is `:`A. Wobble hypothesisB. Gene flow hypothesisC. Template hypothesisD. Richmond and Lang effect |
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Answer» Correct Answer - A An anticodon of tRNA can recognise more than one codon of mRNA. It is wobble hypothesis. |
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| 225. |
which of the following two codons have doublei functions?A. AUG,GUGB. UAA,UGAC. UGA,GUGD. UAA,AUG |
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Answer» Correct Answer - A As AUG and GUG are starting codons as well as code for methionine and valine amino acids. |
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| 226. |
UTRs are the untranslated regions present onA. rRNAB. tRNAC. mRNAD. hnRNA |
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Answer» Correct Answer - c |
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| 227. |
In codon in DNA is AAA, what will be the anticodon for it.A. UUUB. AAAC. TTTD. AUG |
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Answer» Correct Answer - B DNA is AAA. Its mRNA will be UUU. The anticodon for UUU will be AAA. |
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| 228. |
Given below are the steps of protein synthesis. Arrange them in correct sequence and select the correct option. (i) Codon- anticodon reaction between mRNA and aminoacyl tRNA complex. (ii) Attachment of mRNA and smaller sub-unit of ribosome. (iii) Charging or aminoacylation of tRNA . (iv) Attachment of larger sub-unit of ribosome to the mRNA-tRNA `_("Met")` complex. (v) Linking of adjacent amino acids. (vi) Formation of polypeptide chain.A. `(ii)to(i)to(iii)to(v)to(iv)to(vi)`B. `(v)to(ii)to(i)to(iii)to(iv)to(vi)`C. `(iii)to(ii)to(iv)to(i)to(v)to(vi)`D. `(iii)to(ii)to(i)to(iv)to(v)to(vi)` |
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Answer» Correct Answer - d |
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| 229. |
Transcription of genetic code occurs from DNA molecule to aA. DNA moleculeB. RNA moleculeC. ProteinD. Both DNA and RNA |
| Answer» Correct Answer - b | |
| 230. |
Anticodon isA. Paired triplet of bases on messenger RNAB. Unpaired triplet of bases on rRNAC. Paired triplet of bases on rRNAD. An unpaired triplet of bases in a exposition of tRNA |
| Answer» Correct Answer - d | |
| 231. |
Protein synthesis in an animal cell occursA. Only on the ribosomes present in cytosolB. On ribosomes present in cytoplasm as well as in mithochondiraC. Only ribosomes attached to the nuclear envelope and endoplasmic reticulumD. On ribosomes present in the nucleolus as well as in cytoplasm |
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Answer» Correct Answer - b b) On ribosomes present in cytoplasm as well as in mitochondria, mitochondria and choroplast alao have their own DNA, RNA and ribosomes so can synthesis half of their required protein. |
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| 232. |
DNA elemaets, which can switch their position , are calledA. ExonsB. IntronsC. CistronsD. Transposns/Jumping genes |
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Answer» Correct Answer - d d) Transposons are genetic elements which were originally discovered in maize plant by B. McClintock. It is responsible for turning the expression of gener on or off. |
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| 233. |
DNA parts which can switch their position areA. exonsB. intronsC. cistronsD. transposons |
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Answer» Correct Answer - D Transposons are genetic elements varying from 750 base pairs to 40 kilo base pairs on length and can move from a site in one genome to another site in the same or in a differeny genome. |
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| 234. |
Protein synthesis in an animal cell, takes placeA. only in the cytoplasmB. in the nucleolus as well as in the mitochondriaC. in the cytoplasm as well as in mitochondriaD. only only on ribosomes attached to a nucleus |
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Answer» Correct Answer - C Protein synthesis is a complex process it essentially involves DNA for the synthesis of mRNA (transcription) which containsn information for the synthesis of proteins (translation). The process of translation takes place on ribosomes which are found in cytoplasm (in attached form on ER) and in mitochondria ( in the free form). |
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| 235. |
Genes that are involved in turning on or off the transcription of set of structural genes are called Or Functioning of structural genes is controlled byA. Polymorphic genesB. Operator genesC. Redundant genesD. Regulatory genes |
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Answer» Correct Answer - b b) Operatorr gene controls the activity of structrual gene which synthesizes m-RNA (Transcription). |
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| 236. |
Genes that are involved in turning on or off the transcription of set of structural genes are called Or Functioning of structural genes is controlled byA. polymorphic genesB. operator genesC. reductant genesD. regulatory genes |
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Answer» Correct Answer - D The switching on and off of an operator is controlled by respressor protein which is coded by the regulator gene R. |
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| 237. |
The lac operon is turned on when allolactose molecules bind toA. Operator geneB. mRNAC. Repressor proteinD. Promoter site |
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Answer» Correct Answer - C Lac operon is turned on when lactose or allolactose binds to repressor protein. |
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| 238. |
Assertion : Nucleotide triphosphates acts as substrates during transcription. Reason : Transcription and translation takes place at different sites in prokaryotes.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false. |
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Answer» Correct Answer - D `**` Nucleoside triphosphates acts as substrates during transcription. `**` Transcription and translation takes place at different sites in eukaryotes (transcription in nucleus and translation in cytoplasm). |
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| 239. |
In the lac operon, the structural genes are switched off whenA. Repressor binds to poeratorB. Repressor binds to promotorC. Repressor binds to regularD. Repressor binds to inducer |
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Answer» Correct Answer - a a) A short sequence of DNA where the repessor binds preventing RNA polymerase from attaching to the promoter this is called on/off switch of transcription. |
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| 240. |
In operon model, RNA polymerase binds toA. Structural geneB. Promoter geneC. RegulatorD. Operator gene |
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Answer» Correct Answer - B In operon model, RNA polymerase binds to promoter gene. |
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| 241. |
The sequence of structural genes in lac operon isA. Lac A , Lac Y , Lac ZB. Lac A , Lac Z , Lac yC. Lac Y, Lac Z, LAC AD. Lac Z , Lac Y, Lac A |
| Answer» Correct Answer - d | |
| 242. |
During expression of an operon , RNA polymerase binds toA. structural geneB. regulator geneC. operatorD. promoter |
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Answer» Correct Answer - d |
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| 243. |
Match column I with II column II and select the correct option from the given codes . `{:("Column I","Column II"),(A."Operator site",(i)"Binding site for RNA polymerase"),(B."Promoter site",(ii)"Binding site for repressor molecule"),(C."Regulator gene",(iii)"Codes for protein/enzyme"),(D."Structural gene",(iv)"Codes for repressor molecule"):}`A. A-(ii), B-(i), C-(iii), D-(iv)B. A-(ii), B-(i), C-(iv), D-(iii)C. A-(iv), B-(iii), C-(i), D-(ii)D. A-(ii), B-(iii), C-(i), D-(iv) |
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Answer» Correct Answer - b |
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| 244. |
What is correct gene expression pathway ?A. Gne - mRNAB. Transcription - gene - translation - mRNA - proteinC. Gene - transcription - mRNA - translation - proteinD. Gene - translation - mRNA - transcription - protein |
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Answer» Correct Answer - C Gene expression pathway is : Gene - transcription - mRNA - translation - protein. |
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| 245. |
Operon model of gene regulation and organisation of prokaryotes was proposed byA. Messelson and FranklinB. Wilkins and FranklinC. Beadle and TatumD. Jacob and Monod |
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Answer» Correct Answer - D Operon model of gene regulation and organisation of projaryotes was proposed by Jacob and Monad. |
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| 246. |
DNA fragments areA. Negatively chargedB. NeutralC. Either positively or negatively charged depending on their sizeD. Positively changed |
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Answer» Correct Answer - A DNA fragments are negatively charged. |
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| 247. |
In lac operon , the genes a, I, y and z code respectively forA. Repressor protein, permease,` beta` - galactosidase,B. Transacetylase, permease, `beta`- galactosidase , repressor proteionC. Permease, transacetyase , repressor Protein,`beta` - galactosidaseD. Transacetylase, repressor protein, permease, `beta` - galactosidase |
| Answer» Correct Answer - e | |
| 248. |
Both deoxyribose and ribose belong to a class of sugars calledA. TriosesB. HexosesC. PentosesD. Polyaccharides |
| Answer» Correct Answer - c | |
| 249. |
Genetic information in a DNA molecule is coded in theA. No of basesB. Sequence of nucleotidesC. Length of DNAD. Number of nucleosides |
| Answer» Correct Answer - b | |
| 250. |
A complex of ribosome attached to a single RNA is known asA. PolysomeB. PolymerC. PolypeptideD. Okazaki fragment |
| Answer» Correct Answer - a | |