Molecular Basis of Inheritance

Hershey and Chase experiment proved that:

Taylor and colleagues' experiment proved that DNA replication is:

Which of the following is the correct sequence of events in the transcription?

Removal of introns and joining of exons in a defined order during mRNA processing is called:

DNA fingerprinting involves identifying differences in some specific regions in DNA sequence called as:

In the lac operon, the repressor protein is coded by:

The amino acid attaches to tRNA at its:

In E. coli, the start codon is:

In the lac operon, the z gene codes for ( NEET 2026)

Which of the following statements are correct with reference to a transcription unit? A. A transcription unit in DNA is defined primarily by three regions: promoter, structural gene and terminator. B. The promoter is said to be located towards the 5'-end of the structural gene. C. The promoter is a DNA sequence that provides binding site for RNA polymerase. D. The promoter defines the template and coding strands. E. The terminator is located towards the 3'-end of the coding strand and it defines the end of the process of transcription. ( NEET 2026)

Arrange the following steps of DNA fingerprinting in a correct sequence. A. Isolation of DNA and its digestion by restriction endonucleases. B. Hybridisation using a labelled VNTR probe. C. Transferring of separated DNA fragments to synthetic membranes. D. Detection of hybridised DNA fragments by autoradiography. E. Separation of DNA fragments by electrophoresis. ( NEET 2026)

Which of the following statements are correct with reference to packaging of DNA helix? A. Histones are organized to form a unit of eight molecules called histone octamer. B. Histones are negatively charged basic proteins. C. Histones are rich in the basic amino acid residues - lysine and arginine. D. The positively charged DNA is wrapped around the histone octamer to form nucleosome. E. The packaging of chromatin at higher levels requires an additional set of proteins called non-histone chromosomal proteins. ( NEET 2026)

The sixth mutant codon of beta globin gene causing polymerization of Haemoglobin and change in RBC shape is ( NEET 2026)