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Problem : Fill in the blanks. A reaction that is energetically favorable will _________ energy while one that is energetically unfavorable will _________ energy.

Release. Consume.

Problem : What is the name given to organisms that acquire external energy from the sun? What about those that acquire energy from the ingestion of food?

Organisms, such as plants, that acquire energy from the sun's light are called phototrophs. Humans are chemotrophs and acquire energy from the ingestion of external food sources.

Problem : Fill in the blanks. Metabolic reactions that involve the degradation of molecules are classified as _________ while those that involve the synthesis of molecules are called __________.

Catabolic. Anabolic.

Problem : Which class of metabolic reaction involves the loss of electrons?

Oxidation.

Problem : Which class of metabolic reaction does not actually change to atomic composition of a molecule?

Isomerization.
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