Molecular Basis of Inheritance 2

In E. colt, the lac operon gets switched on when

• lactose is present and it binds to the repressor

• repressor binds to operator

• RNA polymerase binds to the operator

• lactose is present and it binds to RNA polymerase.

In DNA strand, the nucleotides are linked together by

• glycosidic bonds

• phosphodiester bonds

• peptide bonds

• hydrogen bonds.

If a double stranded DNA has 20% of cytosine, what will be the percentage of adenine in it ?

• 20%

• 40%

• 30%

• 60%

If the sequence of bases in one strand of DNA is ATGCATGCA, what would be the sequence of bases on complementary strand ?

• ATGCATGCA

• AUGCAUGCA

• TACTACGT

• UACGUACGU

How far is each base pair from the next one in DNA double helix model ?

• 2 nm

• 3.4nm

• 34 nm

• 0.34 nm

Synthesis of DNA from RNA is explained by

• central dogma reverse

• reverse transcription

• feminism

• all of these.

Histone proteins are

• basic, positively charged

• basic, negatively charged

• acidic, positively charged

• acidic, negatively charged

The structure in chromatin seen as ‘beads-on string’ when viewed under electron microscope are called

• nucleotides

• nucleosides

• histone octamer

• nucleosomes.

Find out the wrong statement about heterochromatin,

• It is densely packed

• It stains dark.

• It is transcriptionally active.

• It is late replicating.

They year 2003 was celebrated as the 50th anniversary of discovery of

• transposons by Barbare Me Clintock

• structure of DNA by Watson and Crick

• Mendel’s laws of inheritance

• biotechnology by Kary Muliis.