DNA is made up of repeating sequences of?

Nucleic Acids

Explanation:

DNA, Deoxyribonucleic acid, is made up up nucleic acids. These nucleic acids are:

Adenine

Guanine

Cytosine

Thymine

Adenine binds to Thymine and Cytosine binds to Guanine. They are then "twisted" into a double helix.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.