The daughter DNA that was extracted from the culture one generation after the transfer from ¹⁵N to ¹⁴N medium had:

1.	Low density
2.	Intermediate density
3.	High density
4.	One had low and another had high density

A failure in cell division after DNA replication results in:

What is another name for thymine?

In Griffith's experiment, which of the following bacterial strains was capable of causing pneumonia in mice?

What facilitates the opening of the helix during the elongation step of transcription?

The repressor of the lac operon is:

The base pairing in a double stranded DNA is correctly described as:

Any mistakes during DNA replication by the enzyme would result into:

In a transcription unit, RNA polymerase binds to:

The distance between a base pair in the DNA double helix is approximately: