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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.
| 451. |
If a bacteriophage having `P^(32)` infects a baterium growing on normal medium thenA. some of the bacteriophages produced shall incorporate `P^(32)`B. all the newly produced bacteriophages shall incorporate `P^(32)`C. none of the bacteriophages produced shall incorporate `P^(32)`.D. none of these |
| Answer» Correct Answer - A | |
| 452. |
The template for protein synthesis isA. DNAB. mRNAC. rRNAD. tRNA |
| Answer» Correct Answer - B | |
| 453. |
Wobble hypothesis establishes `:`A. Peptide chain formationB. Initiation of peptide chainC. Termination of peptide chainD. Economy in tRNA molecules |
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Answer» Correct Answer - D Wobble hypothesis established economy in tRNA molecules. |
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| 454. |
Wobble hypothesis was given byA. F.H.C CrickB. NirenbergC. HolleyD. Khorana |
| Answer» Correct Answer - A | |
| 455. |
The sequence of nitrogen bases (triple) on t RNA isA. AnticodonB. Terminating codonC. Degenerate codonD. Initating codon |
| Answer» Correct Answer - a | |
| 456. |
Bases composition in RNA isA. A+ T = G + CB. A + G = T + CC. A + U = G + CD. A + G = U + C |
| Answer» Correct Answer - d | |
| 457. |
Which of the following statements is the most appropriate for sickle cell anaemiaA. it cannot be treated with iron supplementsB. It is a molecular diseaseC. It confers resistance to acquiring malariaD. All of the above |
| Answer» Correct Answer - d | |
| 458. |
Which of the following statement is the most appropriate for sickle cell anaemia ?A. It cannot be treated with iron supplementsB. It is a molecular diseaseC. It confers resistance to acquiring malariaD. all of the above |
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Answer» Correct Answer - d |
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| 459. |
Genetic code of nucleic acid depends uponA. Number of nucleic acidB. Position of nucliec acidC. Sequence of nucleic acidD. all the above |
| Answer» Correct Answer - c | |
| 460. |
What will be the corect gene expression pathwayA. Gene - m RNA -transcripation - translation -proteinB. Trancription -Gene -translation -m RNA -proteinC. Gene -translation -m RNA -transcription- proteinD. Gene -translation -m RNA - transcription -protein |
| Answer» Correct Answer - c | |
| 461. |
The structure of one nucleotide is given below Or Which of the following figure shows two nucleotides correctly joined together A. B. C. D. |
| Answer» Correct Answer - b | |
| 462. |
Assertion. Ionizing radiations are harmful for the living organisms. Reason. They form toxic photo products in the cells.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 - C | |
| 463. |
Which one of these statements is not correct during protein synthesis.A. UAA codon codes for lysineB. UGG codon codes for tryptophanC. Cysteine is coded by UGU and UGC codonesD. tyrosine is coded by UAU and UAC codons |
| Answer» Correct Answer - A | |
| 464. |
Nitrogenous bases present in DNAA. Adenine Guanine Cytosine, ThymineB. Adenine Guanine Cytosine UracilC. Adenine Thymine UracilD. Guanine and Uracil |
| Answer» Correct Answer - A | |
| 465. |
A DNA molecule having `A+G//C+T=0.71` shows that the molecule is:A. LinearB. CircularC. Single-strandedD. Double-stranded |
| Answer» Correct Answer - C | |
| 466. |
In a DNA molecule distance between two bases isA. `2 nm//20 Å`B. `0cdot2 nm//2 Å `C. `3cdot4 nm//34 Å`D. `0cdot34 nm//3cdot4 Å` |
| Answer» Correct Answer - D | |
| 467. |
Chromatin is chemically made ofA. Nucleic acid, histone and non-histone proteinsB. Nucleic acid and histone proteinsC. Nucleic acid and non-histone proteinsD. Nucleic acid |
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Answer» Correct Answer - A Chromatin is chemically made of nucleic acid, histone and non-histone proteins. |
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| 468. |
The haploid content of human DNA isA. `3.3xx10^(9)` bpB. `3.3 xx 10^(9)` kbpC. 4.6 xx 10^(6) bpD. 48502 bp |
| Answer» Correct Answer - a | |
| 469. |
A scientist was studying an in vitro euckaryotic transcription system, which produced both capped and uncapped mRNAs. For an experiment, he incubated these mRNAs with mammalian cell nuclear extract and quantified the different products as shown . Which of the following graphs represents the expected result correctly ?A. B. C. D. |
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Answer» Correct Answer - d |
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| 470. |
C-value is the characteristic DNA content in a haploid cell of a given species. Earlier it was considered that C-value correlates with organism complexity. However, it is now evident that C-value varies enormously among species and this bears no correlation with the complexity of hte organisms . For example, the cells of some salamanders may contain 40 times more DNA than those of humans. Which of the following explains this C-value paradox?A. PolyploidyB. Chromosomal mutationC. Non-coding DNAD. Coding DNA |
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Answer» Correct Answer - c |
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| 471. |
Variable part of DNA molecule isA. PhosphateB. SugarC. Nitrogen baseD. Both (B) and (C) |
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Answer» Correct Answer - C Variable part of DNA molecule is nitrogen base, it may be A, G, T or C. |
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| 472. |
Which one of the following ratios is variable but constant for a species?A. `([A+T])/([G+C])`B. `([A+G])/([T+C])`C. `([A+U])/([G+C])`D. None of these |
| Answer» Correct Answer - A | |
| 473. |
Smallest gene affected by mutation isA. MutonB. CistronC. ReconD. Exon |
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Answer» Correct Answer - A Smallest gene affected by mutation is muton. |
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| 474. |
Polyribosomes are formed when ribosomes are connected byA. rRNAB. mRNAC. tRNAD. All of the above |
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Answer» Correct Answer - B Polyribocomes are formed when ribosomes are connected by mRNA. |
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| 475. |
The term gene was coined byA. McClintockB. MorganC. JohannsenD. De Duve |
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Answer» Correct Answer - C The term gene was coined by Johannsen. |
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| 476. |
Termination of polypeptide chain is brought about byA. UUG, UAG and UCGB. UAA, UAG and UGAC. UUG, UGG and UCAD. UCG, GCG and ACC |
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Answer» Correct Answer - B Termination of polypeptide chain is brought about by UAA, UAG and UGA. |
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| 477. |
Which amino acid determines by four gentic codesA. Leucine (Leu)B. Proline (Pro)C. Seine (Ser)D. Tyrosine (Tyr) |
| Answer» Correct Answer - b | |
| 478. |
The first codon discovered by Nirenberg and Matthaei wasA. GGGB. CCCC. UUUD. AAA |
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Answer» Correct Answer - C The first codon discovered by Nirenberg and Matthaei was UUU. |
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| 479. |
Genetic code determinesA. Sequence of amino acids in protein chainB. VariationsC. Constancy of morphological traitsD. Structural pattern |
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Answer» Correct Answer - A Genetic code determines sequence of amino acids in protein chain. |
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| 480. |
Three dimensional shape of tRNA isA. Inverted-shapedB. Clover leaf-likeC. X-shapedD. Y-shaped |
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Answer» Correct Answer - A Three dimensional shape of tRNA is L-shaped/more correctly inverted L-shaped. |
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| 481. |
Transcription involvesA. Synthesis of RNA over DNAB. Joining of amino acids in a polypeptideC. Synthesis of RNA over ribosomeD. Synthesis of DNA |
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Answer» Correct Answer - A Transcription involves synthesis of RNA over DNA. |
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| 482. |
Which one is correct matching RNA ?A. Anticodon - Site of tRNA having complementary bases to a codon ofB. Transcription - Synthesis of proteinC. Ribosomal RNA - Carries amino acid to site of protein synthesisD. Translation - Process of mRNA carrying information from nucleus to ribosome |
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Answer» Correct Answer - A `**" "`Translation - Synthesis of protein `**" "`tNA - Carries amino acid to site of protein synthesis `**" "`Transcription - Process of mRNA carrying information from nucleus to ribosome |
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| 483. |
Genetic code was discovered byA. Nirenberg and MatthaeiB. Nirenberg and HolleyC. Holley and OchoaD. Holley, Nirenberg and Khorana. |
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Answer» Correct Answer - D Genetic code was discovered by Holley, Nirenberg and Khorana. |
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| 484. |
Genetic code was discovered by `:`A. Nirenberg and mathaeiB. Hershey and ChaseC. Morgan and SturtevantD. Beadle and Tatum |
| Answer» Correct Answer - a | |
| 485. |
In 125 amino acid sequence if codeon for` 25 ^`(th) amino acid is mutated to UAA , thenA. A polypeptide of 24 amino acids is formedB. A polypeptide of 124 amino is formedC. No polypeptide are formedD. A polypeptide of 25 amino acids is formed |
| Answer» Correct Answer - a | |
| 486. |
Central dogma of genetic information is modified by the discovery ofA. Reverse transcriptaseB. DNA polymeraseC. RNA polymeraseD. Ligase |
| Answer» Correct Answer - A | |
| 487. |
The central dogma of protein synthesis in teminious isA. `g. RNA to DNA to m - RNA to protein`B. `DNA to G-RNA to m-RNA to protein `C. `DNA to DNA to m-RNA to protein`D. `m-RNA to g.RNA to DNA to Protein` |
| Answer» Correct Answer - a | |
| 488. |
The enzyme responsible for transcription is :-A. RNaseB. EndonucleasesC. RNA polymeraseD. DNA polymerase |
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Answer» Correct Answer - C Enzyme required for transcription is DNA dependent RNA polymerase. |
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| 489. |
Reverse transcription was discovered byA. Beadle and TatumB. Temin and BaltimoreC. Watson and CrickD. Khorana |
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Answer» Correct Answer - B Reverse transcription was discovered by Temin and Baltimore. |
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| 490. |
The enzyme responsible for reverse transcription isA. RNA polymeraseB. Reverse transcriptaseC. DNA polymeraseD. Transcriptase |
| Answer» Correct Answer - b | |
| 491. |
Match the enzymes in column I and column II with its function in coulmn II and select the correct option A. A-2,B-1,C-4,D-3B. A-3,B-4,C-1,D-2C. A-2,B-4,C-1,D-3D. A-1,B-2,C-4D-3 |
| Answer» Correct Answer - b | |
| 492. |
The enzyme reverse trasncriptase isA. RNA dependent RNA polymeraseB. RNA dependent DNA PolymeraseC. DNA dependent DNA PolymeraseD. DNA dependent RNA Polymerase |
| Answer» Correct Answer - b | |
| 493. |
Initiation of polypeptide chain in eukaryotic protein synthesis in incduced byA. Methionine (AUG)B. LeucineC. LysineD. Glycine |
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Answer» Correct Answer - a a) Methionine is coded by initation codon of AUG. |
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| 494. |
To which of the following factors, RNA polymerase binds transiently to initiate transcriptionA. RHOB. BetaC. GammaD. Sigma |
| Answer» Correct Answer - d | |
| 495. |
Operon isA. A set of closely linked genes regulating a metabolic pathways in prokaryotesB. The sequence of three nitrogen bases determining a single amino acidC. The sequeace of nitrogen bases in mRNA which codes for s single amino acidD. A gene responsible for switching on or off other genes |
| Answer» Correct Answer - a | |
| 496. |
Code of m- RNA and proteins areA. CoplanarB. ColinearC. NonlinearD. Irregular |
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Answer» Correct Answer - b b) both polypeptide and DNA or mRNA have a linear arrangement of their compnents. |
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| 497. |
Transformation was discovered byA. Watson and crickB. Meselson and stahlC. Hershey and chaseD. Griffith |
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Answer» Correct Answer - D In lactose operon of E. coli, the lac I gene product is the repressor which blocks the operator gene so that the structural genes are unable to form mRNAs. Thus, regulation of lac operon by repressor is referred to as negative regulation. Due to the repressor the lac operoon remains in inactive state and is thus inducible. |
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| 498. |
Which one of the following is wrongly matched ?A. Transcription - Writing information from DNA to tRNAB. Translation - Using information in mRNA to make proteinC. Repressor protein - Binds to operator to stop enzyme synthesisD. Operon - Structural genes, operator and promoter |
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Answer» Correct Answer - A Statement (a) is wrongly matched bacause transcription is a process of mRNA synthesis from a DNA template . It involves three main events, i.e. initiation (binding of RNA polymerase to as DNA), elongation (development of a short stretch of DNA) and termination (recognition of the transcription termination sewuence and the release of RNA polymerase). |
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| 499. |
Which one of the following is wrongly matchedA. Repressor protein- Binds to operator to stop enzyme synthesisB. Operon - Structural genes, operator and promoterC. Transcription -Writing information from DNA to t-RNAD. Translation- Using information in m-RNA to make protein |
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Answer» Correct Answer - b b) Operon consistof - regulator gene, promoter, gene, opertor gene and structural gens. |
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| 500. |
Which one of the following is wrongly matched ?A. Transcription - Writing information from DNA to t-RNAB. Translation - Using information in m-RNA to make proteinC. Repressor protein - Binds to operator to stop enzyme synthesisD. Operon - Structural genes, operator and promoter |
| Answer» Correct Answer - A | |