Why is sickle celled anaemia called molecular disease ?

A person with sickle cell anaemia is:

Which of the following is a molecular disease?

Why is the frequency of sickle cell anaemia more in the malaria prone areas?

Thalassemia and sickle cell anaemia are caused due to a problem including molecules synthesis. select the correct statement.

Why is alcohol called an anaesthetic?

Why are communicable diseases called infectious diseases ?

Why is tetanus also called lockjaw disease?

Why is Trypanosomiasis called endemic disease?