Molecular Basis of Inheritance Biology NEET Quiz Online

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Details of Molecular Basis of Inheritance Biology NEET Quiz Online :
No. of Questions in Quiz35 with Explanation
Time for each Questions60 Seconds
Attempts AllowedUnlimited
Pass Percentage70 %

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#1. All of the following are part of an operon except

  • Enhancer sequences are present in eukaryotes.
  • Operon concept is for prokaryotes.

#2. Adjacent nucleotides in a polynucleotide chain are joined by

Coding strand and mRNA has same nucleotide sequence except, ‘T’ – Thymine is replaced by ‘U’–Uracil in mRNA.

#3. Select the correct match

Francois Jacob and Jacque Monod proposed model of gene regulation known as operon model/lac operon. – Alec Jeffreys – DNA fingerprinting technique. – Matthew Meselson and F. Stahl – Semi-conservative DNA replication in E. coli. – Alfred Hershey and Martha Chase – Proved DNA as genetic material not protein

#4. The experimental proof for semiconservative replication of DNA was first shown in a

Semi-conservative DNA replication was first shown in Bacterium Escherichia coli by Matthew Meselson and Franklin Stahl.

#5. 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?

If deletion occurs at 901 position the remaining 98 bases specifying for 33 codons of amino acids will be altered.

#6. The final proof for DNA as the genetic material came from the experiments of

Hershey and Chase gave unequivocal proof which ended the debate between protein and DNA as genetic material.

#7. The association of histone H1 with a nucleosome indicates

The association of H1 protein indicates the complete formation of nucleosome. Therefore the DNA is in condensed form.

#8. Spliceosomes are not found in cells of

Spliceosomes are used in removal of introns during post-transcriptional processing of hnRNA in eukaryotes only as split genes are absent as prokaryotes.

#9. DNA replication in bacteria occurs

DNA replication in bacteria occurs prior to fission. Prokaryotes do not show well marked S-phase due to their primitive nature.

#10. Which of the following RNAs should be most abundant in animal cell?

rRNA is most abundant in animal cell. It constitutes 80% of total RNA of the cell.

#11. During DNA replication, Okazaki fragments are used to enlongate

Two DNA polymerase molecules work simultaneous 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.

#12. Taylor conducted the experiments to prove semiconservative mode of chromosome replication on

Semiconservative mode of chromosome replication was proved by Taylor in Vicia faba.

#13. The equivalent of a structural gene is

Cistron is a segment of DNA coding for a polypeptide.

Eukaryotic structural gene is monocistronic whereas prokaryotic structural gene is polycistronic.

#14. Which of the following rRNAs acts as structural RNA as well as ribozyme in bacteria?

23S rRNA is a component of larger subunit of ribosome and it act as peptidyl transferase (ribozyme).

#15. DNA-dependent RNA polymerase catalyzes transcription on one strand of the DNA which is called the

The DNA-dependent RNA polymerase catalyze the polymerisation in only one direction that is 5′ → 3′, the strand with polarity 5′ → 3′ act as template and is called as template strand.

#16. Which of the following is required as inducer(s) for the expression of Lac operon?

Lac operon is an inducible operon. Lactose is the substrate for the enzyme beta-galactosidase and it also regulates switching on and off of the operon. Hence, it is termed as inducer.

#17. Which of the following is not required for any of the techniques of DNA fingerprinting available at present?

A zinc finger is a small protein structural motif that characterised by the co-ordination of one or more Zn ions in order to stabilise the folds.

#18. Which one of the following is the start codon?

AUG is the start codon. UAA, UAG and UGA are stop codons.

#19. Identify the correct order of organisation of genetic material from largest to smallest

#20. Satellite DNA is important because it

Satellite DNA are the repetitive DNA which do not code for any protein. They show high degree of polymorphism and form basis of DNA fingerprinting. Since DNA from every tissue from an individual show the same degree of polymorphism, they become very useful identification tool in forensic applications.

#21. Gene regulation governing lactose operon of E.coli that involves the lac I gene product is

Lac operon under control of repressor is a negative regulation. The nature of operon is inducible.

#22. Which one of the followings is wrongly matched?

Operon → Structural, Operator, Promoter and Regulator genes.

#23. Transformation was discovered by

On Diplococcus pneumoniae

#24. Which enzyme/s will be produced in a cell in which there is a nonsense mutation in the lac Y gene?

#25. Removal of RNA polymerase III from nucleoplasm will affect the synthesis of

Polymerase III → Synthesize tRNA

#26. Removal of introns and joining of exons in a defined order during transcription is called

#27. Which one of the following is not a part of a transcription unit in DNA?

Inducer → is a chemical which will trigger the DNA to switch on gene in its presence.

#28. If one strand of DNA has the nitrogenous base sequence as ATCTG, what would be the complementary RNA strand sequence?



#29. PCR and Restriction Fragment Length Polymorphism are the methods for


#30. What is it that forms the basis of DNA fingerprinting?

Satellite DNA occur in highly repeated member.

#31. Which one of the following also acts as a catalyst in a bacterial cell?

#32. What are those structures that appear as 'beads – on – string' in the chromosomes when viewed under electron microscope?

#33. In history of biology, human genome project led to the development of

#34. The unequivocal proof of DNA as the genetic material came from the studies on a

Hershy and Chase experiment on T2 Bacteriophage




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26 thoughts on “Molecular Basis of Inheritance Biology NEET Quiz Online”

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  1. Great quiz at proper neet level
    Thank u very much …it’s really worthy
    Plz make some more for other bio chapters
    And inorganic chemistry also if possible


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