Read the following four statement.
1. In transcription, adenosine pairs with uracil
2. Regulation of lac operon by repressor is referred to as positive regulation.
3. The human genome has approximately 50,000 genes.
4. Haemophilia is sex-linked recessive disease.

How many of the above statements are right?

Two

Three

Four

One

Solution

Two

Transcription is the process of synthesis of RNA on the DNA template. During transcription adenosine pairs with uracil.
Repressor gene determines the transcription of structural gene. It codes for repressor protein. After synthesis the repressor molecule is diffused from the ribosome and bind to the operator in absence of inducer.
The human genome has approximately 30000 genes with ~ 3.2 billion base pairs.