Molecular Basis of Inheritance

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

1. Nucleosomes
2. Genes
3. Nucleotides
4. Base pairs

The 3'-5' phosphodiester linkages inside a polynucleotide chain serve to join -

1. One nucleotide with another nucleotide
2. One nitrogenous base with pentose sugar
3. One nucleoside with another nucleoside
4. One DNA strand with the other DNA strand

The lac operon consists of -

1. Three regulatory genes and three structural genes
2. Four regulatory genes only
3. Two regulatory genes and two structural genes
4. One regulatory gene and three structural genes

In eukaryotic cell transcription, RNA splicing and RNA capping take place inside the -

1. Dictyosomes
2. Ribosomes
3. Nucleus
4. ER

Which one of the following statements about the particular entity is true?

1. Nucleosome is formed of nucleotides
2. Centromere is found in animal cells, which produces aster during cell division
3. The gene for producing insulin is present in every body cell
4. DNA consists of a core of eight histones

Which one of the following does not follow the central dogma of molecular biology ?

1. Mucor
2. HIV
3. Chlamydomonas
4. Pea

The one aspect which is not a salient feature of genetic code, is its being –

1. Specific
2. Degenerate
3. Ambiguous
4. Universal

Select the two correct statements out of the four (A–D) statements given below about lac operon. The correct statements are :

1. B and D
2. A and B
3. B and C
4. A and C

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

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

Semi-conservative replication of DNA was first demonstrated in:

1. Drosophila melanogaster
2. Streptococcus pneumoniae
3. Salmonella typhimurium
4. Escherichia coli