Question

fats and oils are constructed from
o a. carboxyl and amino acids
o b. glycerol and amino acids
o c. carboxyl and fatty acids
o d. glycerol and fatty acids

an enzyme is a biological catalyst that alters chemical reactions by
o a. increasing body temperature to allow reactions to occur at a faster rate
o b. increasing the rate of reaction without high temperatures
o c. breaking apart allowing its components to form new bonds
o d. raising the heat energy required to alter chemical bonds

Explanation:

• First question: Fats and oils (triglycerides) are formed by the esterification of glycerol (a polyol) with fatty acids. Amino acids are the building blocks of proteins, and carboxyl is a functional group (-COOH) not a standalone molecule for forming fats/oils.
• Second question: Enzymes are biological catalysts. Catalysts lower the activation energy of a reaction, increasing the rate of reaction without the need for high temperatures (which can be harmful in biological systems). They do not break apart to form new bonds (that's a reaction mechanism not related to catalysis here) and they do not raise the heat energy (activation energy is lowered).

Answer:

• First question: D. glycerol and fatty acids
• Second question: B. increasing the rate of reaction without high temperatures