Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a triplet?

1.	Nirenberg and Matthaei	2.	Hershey and Chase
3.	Morgan and Sturtevant	4.	Beadle and Tatum

Semiconservative replication of DNA was first demonstrated in:

1. Drosophila melanogaster

2. Escherichia coli

3. Streptococcus pneumoniae

4. Salmonella typhimurium

What is not true for genetic code?

1. A codon in mRNA is read in non-contiguous fashion

2. It is nearly universal

3. It is degenerate

4. It is unambiguous

Telomere repetitive DNA sequences control the function of eukaryotic chromosomes because they:

1. act as replicons

2. are RNA transcription initiators

3. help chromosome pairing

4. prevent chromosome loss

Which one of the following pairs of nitrogenous bases of nucleic acids is wrongly matched with the category mentioned against it?

1. Thymine, Uracil - Pyrimidines
2. Uracil, Cytosine - Pyrimidines
3. Guanine, Adenine - Purines
4. Adenine, Thymine - Purines

Molecular basis of organ differentiation depends on the modulation in transcription by:

1. RNA polymerase

2. ribosome

3. transcription factor

4. anticodon

The length of the DNA molecule greatly exceeds the dimensions of the nucleus in eukaryotic cells. How is this DNA accommodated?

1. Deletion of non-essential genes

2. Super-coiling in nucleosomes

3. DNAse digestion

4. Through the elimination of repetitive DNA

During transcription, RNA polymerase holoenzyme binds to a gene promoter and assumes a saddle-like structure. What is its DNA-binding sequence?