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?

Differentiation of organs and tissues in a developing organism is associated with:

1. developmental mutations

2. differential expression of genes

3. lethal mutations

4. deletion of a gene

The Okazaki fragments in DNA chain growth:

The two polynucleotide chains in DNA are:

1. parallel

2. discontinuous

3. antiparallel

4. semiconservative

One gene-one enzyme relationship was established for the first time in:

1. Neurosporacrassa

2. Salmonella typhimurium

3. Escherichia coli

4. Diplococcuspneumonia

A sequential expression of a set of human genes occurs when a steroid molecule binds to the:

1. transfer RNA

2. messenger RNA

3. DNA sequence

4. ribosome

Which antibiotic inhibits the interaction between t-RNA and m-RNA using bacterial protein synthesis?

1. Erythromycin

2. Neomycin

3. Streptomycin

4. Tetracycline