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.
| 501. |
Transformation was discovered byA. Meselson and StahlB. Hershey and ChaseC. GriffithD. Watson and Crick |
| Answer» Correct Answer - C | |
| 502. |
Which is not true for virusesA. they are living organismsB. they are larger than bacteriaC. they have DNA or RNAD. they replicate in animal cells only |
| Answer» Correct Answer - C | |
| 503. |
Plant viruses mostly containA. ssRNAB. dsRNAC. ssDNAD. dsDNA |
| Answer» Correct Answer - A | |
| 504. |
DNA can be tested byA. IodineB. Fuelgen reactionC. Rolish testD. Millions reagent |
| Answer» Correct Answer - B | |
| 505. |
Genetic drift operates only inA. Island populationsB. Smaller populationsC. Larger populationsD. Mendelian populations |
|
Answer» Correct Answer - b b) Genetic drift is a random change in gene frequency from one generation to another in a population. |
|
| 506. |
The two strands of DNA are held together by `:`A. Peptide bondsB. Phosphodiester bondsC. Hydrogen bondsD. S - S bonds |
|
Answer» Correct Answer - C The two strands of DNA are held together by hyrogen bonds. |
|
| 507. |
Which one of the following pairs of terms/names mean one and the same thingA. Gene pool-genomeB. Codon-geneC. Cistron-tripletD. DNA fingerprinting -DNA profiling |
| Answer» Correct Answer - D | |
| 508. |
Which one of the following correctly represents the manner of replication of DNAA. B. C. D. |
| Answer» Correct Answer - D | |
| 509. |
Which one of the following pairs of terms/names mean one and the same thingA. Gene pool-GenomeB. Codon-geneC. Cistron-TripletD. DNA fingerprinting-DNA profiling |
|
Answer» Correct Answer - d d) The dark bands on X-rays film represent the DNA fingerprints or the DNA profiles. |
|
| 510. |
A nucleoside differs from a nucleotide in not havingA. PhosphateB. SugerC. Nitrogen baseD. Phosphate and suger |
|
Answer» Correct Answer - a a) I a nucleotide, purine or pyrimidine nitrogenous base is joined by deoxyribose pentose sugar (D), which is further linked with phosphate (P) group to form nucleotides. |
|
| 511. |
Dr. Hargovind Khorana deuced the code for which of the following amino acidsA. Serine and leucineB. Phenylalanine and methionineC. Isoleucine and leucineD. Valine and glutamic acid |
| Answer» Correct Answer - a | |
| 512. |
Operon containsA. Operator + Regulator genesB. Operator + Regulator + Structural genesC. Operator + Regulator + Repressor genesD. Operator + Regulator + Structural + Repressor + Promoter genes |
| Answer» Correct Answer - d | |
| 513. |
In ans inclucible operon, the genes areA. Usually not expressed unless a signal turns them "on"B. Usually expressed unless a signal turns them "off"C. Never expressedD. Alaways expressed |
| Answer» Correct Answer - a | |
| 514. |
Which enzyme/s will be produced in a cell in which there is a nonsese mutation in the lac Y geneA. Lactose permease and transactylaseB. `beta` galactosidaseC. Lactose permeaseD. Tranacetylase |
| Answer» Correct Answer - b | |
| 515. |
Lactose metabolising enzyme, produced in the presence of loctose only isA. Inducible anzymeB. Repressible enzymeC. Regulatory enzymeD. Constitutive enzyme |
|
Answer» Correct Answer - A Lactose metabolising enzyme, produced in the presence of lactose only is inducible enzyme. |
|
| 516. |
Which one of the foil owing have dual function ? It codes for methionine and acts as initiator codonA. AUGB. AUCC. ACUD. ACA |
| Answer» Correct Answer - A | |
| 517. |
Whihc one of the following statement is not correctA. Cysteine is coded by UGU and UCC codonsB. Tyrosine is coded by UGU and UAC codonsC. UAA codon condes for lysineD. UGG codon for trytophan |
| Answer» Correct Answer - c | |
| 518. |
Select the correct match:-A. G.Mendel-TransformationB. T.H. Morgan-TransductionC. `F_(2)xx` Recessive parent-Dihybrid crossD. Ribozyme-Nucleic acid |
| Answer» Correct Answer - D | |
| 519. |
The association of histone `H_(1)` with a nucleosome indicatesA. DNA replication is occurring.B. The DNA is condensed into a Chromatin Fibre.C. The DNA double helix is exposed.D. Transcription is occurring. |
|
Answer» Correct Answer - B The association of histone `H_(1)` with a nucleosome indicates the DNA is condensed into a Chromate Fibre. |
|
| 520. |
Assertion : If a piece of DNA to be propagated during recombinant DNA procedures requires a vector. Reason : Vector provides ori.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. |
|
Answer» Correct Answer - A `**` It is because of the requirement of the origin of replication that a piece of DNA if needed to be propagates during recombinant DNA procedures, requires a vector. `**` The vectors provide the origin of replication. |
|
| 521. |
Assertion : Origin of replication (ori) is a definite region in E. coli DNA where the replication originates. Reason : The vectose in r-DNA procedures provide the origin of replication.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. |
|
Answer» Correct Answer - B `**` Origin of replication (ori) is a definite region in E. coli DNA where the replication originates. `**` The vectors in r-DNA procedures provide the origin of replication. |
|
| 522. |
Which one of the following human genes has the longest stretch of DNA `(~24Mb)`?A. Globin geneB. Histone geneC. Dytrophin geneD. Insulin gene |
| Answer» Correct Answer - C | |
| 523. |
Bacteriophages are viruses that eat away bacteria. They usually haveA. dsDNAB. dsRNAC. ssDNAD. ssRNA |
| Answer» Correct Answer - A | |
| 524. |
Which DNA replication startsA. The leading strand produces Okazaki fragmentsB. The hydrogen bonds between the nucleotides of two strands breakC. The phosphodiester bonds between the adjacent nucleotides breakD. The bonds between the nitrogen base and deoxyribose suger break |
| Answer» Correct Answer - b | |
| 525. |
A gene of operon which forms the repressor protein isA. OperatorB. PromoterC. RegulatorD. Structural |
|
Answer» Correct Answer - C A gene of operon which forms the repressor protein is regulator. |
|
| 526. |
The plane of one base pair stacks over the other in double helix. This providesA. Antiparallel nature to DNA double helixB. Uniform length in all DNAC. Uniform width throughout DNAD. Additional stability to DNA |
|
Answer» Correct Answer - D The plane of one base pair stacks over the other in double helix. This provided additional stability to DNA. |
|
| 527. |
Circular DNA is present inA. E.R. and ribosomesB. ribosomes and chloroplastsC. ribosomes and mitochondriaD. mitochondria and chloroplastis |
| Answer» Correct Answer - D | |
| 528. |
In tryptophan operon, the tryptophan acts asA. corepressorB. promoterC. apo-repressorD. operator |
| Answer» Correct Answer - A | |
| 529. |
Lac operon isA. repressible systemB. inducible systemC. five structural genes control itD. controlled by regular gene |
| Answer» Correct Answer - B | |
| 530. |
On cooling the two separated strands of DNA again recoil. It is calledA. chain reactionB. annealingC. both 1 and 2D. palindrome |
| Answer» Correct Answer - B | |
| 531. |
On a planet from a distant galaxy, the pilot vehicle collected a sample of bacteria-like material. On analysis, it showed proteins having 30 types of mino acids while the DNA has 6 types of bases. In the genetic code, a sequence of how many bases should be serving as a codon?A. 2B. 3C. 4D. 5 |
| Answer» Correct Answer - A | |
| 532. |
Find out the number of nucleosomes present in a human cell.A. 16.50 millionB. 16.50 billionC. 33 millionD. 200 million |
|
Answer» Correct Answer - C One human cell has `6.6xx10^(9)` bp `**" "`200 bp fprms =1 nucleosome `:.` 1 bp forms `=1/200` nucleosome `:. 6.6xx10^(9)` bp forms `=(6.6xx10^(9))/200=3.3xx10^(7)` nucleosome `=33xx10^(6)` nucleosome `=33` million nucleosome |
|
| 533. |
RNA polymerase I catalyses synthesis ofA. rRNAB. t RNAC. mRNAD. Sn RNA |
| Answer» Correct Answer - A | |
| 534. |
Best method to determine paternity isA. Protein analysisB. chromosomes countingC. gene countingD. DNA finger printing |
| Answer» Correct Answer - D | |
| 535. |
A.cell is grown in a solution which contain radioactive nucleotides, so that DNA is labelled with radioactivity . It is issolated from the radioactive solution and grown in a normal medium. So that any new DNA strands it makes will not be radioactive. the cell replicates its DNA and divides in the normal medium . the two daughter cell also replicates their DNA and divide, producing a total four cell. if a dotted line represent a radioactive DNA strand and a solid line repreesents a nonradioactive DNA strand, which of the following depicts the DNA of the four cellA. B. C. D. |
| Answer» Correct Answer - d | |
| 536. |
The processes by which m-RNA is made by DNA and protein by m-RNA are respectively called as `:`A. Translation and transcriptionB. Transcription and replicationC. Transcription and translationD. Replication and traslation |
|
Answer» Correct Answer - C `DNA overset("Transcription")(rarr) RNA overset("Translation")(rarr)` Protein |
|
| 537. |
The transfer of protein from electophoretic gel to nitrocellulose membrane is known asA. TransferaseB. Northern blottingC. Western blottingD. Southern blotting |
|
Answer» Correct Answer - c c) Western blotting technique is used for transfer of protein from poly-acrylamide gel electrophoresis (PAG) ontro nitrocellulose membrane. Northern blotting is used for RNA transfer and southern blotting for DNA transfer. |
|
| 538. |
The process by which `m RNA` is made by DNA and protein by `m RNA` are respectively called asA. Trancription and translationB. Translation and translationC. Synthesis of `m RNA` and proteinD. Replication of `m RNA` and protein |
|
Answer» Correct Answer - a a) Formation of mRNA by DNA in nucleus is called transcription and formation of polypeptide chain on ribosomes with the help of mRNA is called translation. |
|
| 539. |
A complex of attached to a single of RNA is known asA. PolymerB. polypeptideC. okazaki fragmentD. polysome |
|
Answer» Correct Answer - D In prokaryotes , several ribosomes may attach to single mRNA and form a chain called polyribosomes or polysomes. |
|
| 540. |
Isolation and purification of specific DNA segment from a living organism was axhieved byA. CrickB. NirenbergC. KhoranaD. Beckwith and his colleagues |
| Answer» Correct Answer - b | |
| 541. |
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 |
|
| 542. |
Sequence of structural genes of lac operon isA. y, z, aB. z, y, aC. a, y, zD. a, z, y |
|
Answer» Correct Answer - B Sequence of structural gene of lac operon is z, y and a. |
|
| 543. |
An environmental agent that triggers transcription from an operon is a/an:A. InducerB. RegulatorC. RepressorD. Controlling factor |
|
Answer» Correct Answer - A Environmental agent triggering transcription from an operon is inducer. |
|
| 544. |
The codon which has dual function is Or polypeptide synthesis in prokaryotes is initiated byA. UGAB. UUUC. AUGD. AAA |
| Answer» Correct Answer - c | |
| 545. |
After a mutation at a genetic locus the character of an organism chagnes due to the change inA. Protein synthesis patternB. RNA transcription patternC. Protein structureD. DNA replication |
|
Answer» Correct Answer - c c) Changed proteins are formed in mutations due to the reason that mRNA transcribed from the mutated gene and the abnormal mRNA introduce different amino acids in the polypeptide chain formed with changed message. |
|
| 546. |
The telomeres of eukaryotic chromosomes consist of short sequences ofA. thymine rich repeatsB. cytosine rich repeatsC. adenine rich repeatsD. guanine rich repeats |
|
Answer» Correct Answer - D Telomeres have been shown to have unique structures that include short nucleotide sequensec present as tandemly repeated units . In eukaryotes the telomeres terminate with a single- eukaryotes the telomeres terminate with a single- stranded DNA [12-16 nucleotides long) rich in guanine. |
|
| 547. |
After a mutation at a genetic locus the character of an organism changes due to the change in :A. protein structureB. DNA replicationC. protein synthesis patternD. RNA transcription pattern |
|
Answer» Correct Answer - A Normally , genetic information floes from DNA `to` mRNA `to` protein . Hence ,any change in nucloetides due to the mutation , would result in change in the structure of protein/ enzyme which moght result in some change in the organism. |
|
| 548. |
One gene - one enzyme relationship was established for the first time onA. Neurospora crassaB. Salmonella typhimuriumC. Escherichia coilD. Diplococcus pneumoniae |
|
Answer» Correct Answer - A One gene- one enzyme relationship was intially proposed by Beadle and Tatum based on their experiments conducted on Neurospora crassa . They were awarded by Nobel Prize in 1958. |
|
| 549. |
"One gene one enzyme" theory was proposed byA. R FranklinB. Harshey and ChaseC. A GarrodD. Beadle and Tatum |
|
Answer» Correct Answer - D One gene- one enzyme hypothesis was given by Beadle and Tatum [1948] which states that particular gene controls the synthesis of specific enzyme. Later , it was modified to one gene - one polypeptide hypothesis by Yanofsky , et . Al , [1965). |
|
| 550. |
One gene - one enzyme relationship was established for the first time onA. salmonella typhimuriumB. Escherichia coliC. Diplococcus pneumoniaeD. Neurospora crassa |
| Answer» Correct Answer - D | |