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NEET Biology MCQ
Molecular Basis Of Inheritance Mcq
Quiz 4
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Q.1
Identify the correct order of organization of genetic material from largest to smallest : [ ReAIPMT 2015]
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a) Chromosome, genome, nucleotide, gene
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b) Chromosome, gene, genome, nucleotide
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c) Genome, chromosomes, nucleotide, gene
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d) Genome, chromosome, gene, nucleotide
Explanation
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Q.2
Eukaryotic genome differs from prokaryotic genome in ... ... [ CBSE 1998 ]
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a) DNA is circular and single-stranded in prokaryotes
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b) Intervening sequences are present in eukaryotic DNA
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c) DNA is complex with histone in prokaryotes
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d) DNA is organized into operon in eukaryotes
Explanation
Answer : (b)
Q.3
Which one carries genetic message to ribosomes? [ Odisha 2000 ]
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a) tRNA
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b) rRNA
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c) mRNA
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d) HnRNA
Explanation
Answer : (c)
Q.4
Radioactive fall out is more harmful to future generations than children now living because .... .... [ PbPMT 2005 ]
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a) Infants are more susceptible to radiation
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b) Susceptibility to radiation increases with age
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c) Mutated genes are frequently recessive
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d) Contamination of milk supply is non-cumulative
Explanation
Answer : (c)
Q.5
Types of RNA polymerases operative in eukaryotes are .... ... [CBSE 2001 ]
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a) Four
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b) Three
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c) Two
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d) One
Explanation
Answer : (b)
Q.6
Which one of the following is wrongly matched? ….[AIPMT 2014]
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a) Repressor protein-Binds to operator to stop enzyme synthesis.
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b) Operon–Structural genes, operator and promoter.
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c) Transcription–Writing information from DNA to t-RNA.
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d) Translation-Using information in m-RNA to make protein.
Explanation
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Q.7
Select the correct option : Direction of Direction of reading RNA synthesis of the template DNA …[AIPMT 2014]
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a) 5'----3' 5'----3'
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b) 3'----5' 3'----5'
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c) 5'----3' 3'----5'
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d) 3'----5' 5'----3'
Explanation
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Q.8
Transformation was discovered by:
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a) Griffith
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b) Watson and Crick
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c) Meselson and Stahl
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d) Hershey and Chase
Explanation
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Q.9
Gene regulation governing lactose operon of E.coli that involves the lac I gene product is : …[AIPMT 2015]
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a) Feedback inhibition because excess of galactosidase can switch off transcription
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b) Positive and inducible because it can be induced by lactose
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c) negative and inducible because repressor protein prevents transcription
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d) negative and repressible because repressor protein prevents transcription
Explanation
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Q.10
In sea urchin DNA, which is double stranded, 17 % of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are : …[AIPMT 2015]
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a) G 8.5%, A 50%, T 24.5%
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b) G 34%, A 24.5%, T 24.5%
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c) G 17%, A 16.5%, T 32.5%
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d) G 17%, A 33%, T 33%
Explanation
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Q.11
Which of the following is required as inducer(s) for the expression of Lac operon ? …[AIPMT-2016]
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a) Glucose
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b) Galactose
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c) Lactose
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d) Lactose and galactose
Explanation
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Q.12
A complex of ribosomes attached to a single strand of RNA is known as :- …[AIPMT-2016]
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a) Polysome
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b) Polymer
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c) Polypeptide
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d) Okazaki fragment
Explanation
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Q.13
Which of the following is not required for any of the techniques of DNA fingerprinting available at present ? …[AIPMT-2016]
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a) Polymerase chain reaction
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b) Zinc finger analysis
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c) Restriction enzymes
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d) DNA–DNA hybridization
Explanation
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Q.14
Which of the following is a restriction endonuclease? …[AIPMT-2016]
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a) Hind II
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b) Protease
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c) DNase I
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d) RNase
Explanation
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Q.15
Which one of the following is the starter codon ? …[AIPMT-2016]
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a) AUG
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b) UGA
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c) UAA
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d) UAG
Explanation
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Q.16
The colonies of recombinant bacteria appear white in contrast to blue colonies of non-recombinant bacteria because of …[NEET 2013]
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a) Non-recombinant bacteria containing beta galactosidase
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b) Insertional inactivation of alpha-galactosidase in non-recombinant bacteria
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c) Insertional inactivation of alpha-galactosidase in recombinant bacteria
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d) Inactivation of glycosidase enzyme in recombinant bacteria
Explanation
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Q.17
Which enzyme/s will be produced in a cell in which there is a nonsense mutation in the lac Y gene? …[NEET 2013] Explanation provided please clikc on
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a) β-galactosidase
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b) Lactose permease
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c) Transacetylase
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d) Lactose permease and transacetylase
Explanation
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Q.18
Taylor conducted the experiment to prove semi-conservative mode of chromosome replication on : …[NEET 2016]
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a) Drosophila melanogaster
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b) E. coli
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c) Vinca rosea
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d) Vicia faba
Explanation
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Q.19
The mechanism that causes a gene to move from one linkage group to another is called : …[NEET 2016]
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a) Translocation
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b) Crossing-over
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c) Inversion
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d) Duplication
Explanation
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Q.20
The equivalent of a structural gene is : …[NEET 2016]
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a) Operon
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b) Recon
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c) Muton
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d) Cistron
Explanation
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Q.21
A molecule that can act as a genetic material must fulfill the traits given below, except :- …[NEET 2016]
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a) It should be unstable structurally and chemically
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b) It should provide the scope for slow changes that are required for evolution
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c) It should be able to express itself in the form of 'Mendelian characters'
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d) It should be able to generate its replica
Explanation
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Q.22
DNA-dependent RNA polymerase catalyzes transcription on one strand of the DNA which is called the :- …[NEET 2016]
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a) Alpha strand
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b) Anti-strand
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c) Template strand
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d) Coding strand
Explanation
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Q.23
The final proof for DNA as the genetic material came from the experiments of ….[NEET- 2017]
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a) Griffith
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b) Hershey and Chase
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c) Avery, Mcleod and McCarty
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d) Hargobind Khorana
Explanation
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Q.24
During DNA replication, Okazaki fragments are used to elongate ….[NEET- 2017]
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a) The leading strand towards replication fork
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b) The lagging strand towards replication fork
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c) The leading strand away from replication fork
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d) The lagging strand away from the replication fork
Explanation
Two DNA polymerase molecules work simultaneous at the DNA fork, one on the leading strand and the other on the lagging strand. Each Okazaki fragment is synthesized by DNA polymerase at lagging strand in 5’ →3’ direction. New Okazaki fragments appear as the replication fork opens further. As the first Okazaki fragment appears away from the replication fork, the direction of elongation would be away from replication fork. Answer:(d)
Q.25
Spliceosome are not found in cells of….[NEET- 2017]
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a) Plants
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b) Fungi
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c) Animals
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d) Bacteria
Explanation
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Q.26
The association of histone H1 with a nucleosome indicates: ….[NEET- 2017]
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a) Transcription is occurring
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b) DNA replication is occurring
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c) The DNA is condensed into a Chromatin Fiber
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d) The DNA double helix is exposed
Explanation
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Q.27
DNA fragments are ….[NEET- 2017]
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a) Positively charged
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b) Negatively charged
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c) Neutral
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d) Either positively or negatively charged depending on their size
Explanation
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Q.28
If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered? ….[NEET- 2017]
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a) 1
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b) 11
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c) 33
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d) 333
Explanation
If deletion occurs at 901st position the remaining 98 bases specifying for 33 codons of amino acids will be altered. Answer:(c)
Q.29
Which of the following RNAs should be most abundant in animal cell? ….[NEET- 2017]
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a) r-RNA
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b) t-RNA
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c) m-RNA
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d) mi-RNA
Explanation
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Q.30
The term "linkage" was coined by : [ ReAIPMT 2015]
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a) W.Sutton
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b) T.H. Morgan
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c) T.Boveri
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d) G.Mendel
Explanation
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