Choose the pair of terms that correctly completes this sentence: catabolism is to anabolism as is to
a. exergonic; spontaneous
b. exergonic; endergonic
c. free energy; entropy
d. work; energy

exergonic; endergonic.

Explanation:

Exergonic reactions may be defined as the reactions in which the energy is released during the reaction. Endergonic reaction are the reaction in which energy is required for the occurrence of reaction.

Catabolism reaction in which the large substance is broken down into simpler substance. Large amount of energy is released during the reaction and considered as exergonic reaction. Anabolism reaction in which small substance combine together to form a large molecule. A large amount of energy is required in this reaction and considered as endergonic reaction.

Thus, the correct answer is option (b).