Carbohydrates, lipids, proteins, and nucleic acids.
It is also known as a rescue agent
To identify the host cell that has taken up the gene of interest
Answer:( answer for number one) an essential nutrient for the production of amino acids, proteins, nucleic acids. ( number 2 ) for the growth, maintenance, and repair of all tissues and cells, and for the production of the genetic building blocks, DNA and RNA
