Question

7 multiple choice 5 points enzymes speed up chemical reactions by lowering the ______.
○ reaction speed
○ substrate amount
○ activation energy
○ product amount
8 multiple choice 5 points the monomers of lipids are:
○ nucleic acids
○ fatty acids
○ amino acids
○ monosaccharides

Explanation:

Question 7

Enzymes act as biological catalysts. Catalysts increase the rate of a reaction by lowering the activation energy (the minimum energy required for a reaction to occur). Reaction speed is what enzymes increase, so lowering it is incorrect. Substrate amount and product amount are not what enzymes lower to speed reactions. So the correct option is activation energy.

Lipids are a diverse group of molecules, and their monomers (building blocks) include fatty acids (and glycerol for some lipids like triglycerides). Nucleic acids are monomers of DNA/RNA, amino acids are monomers of proteins, and monosaccharides are monomers of carbohydrates. So the monomers of lipids are fatty acids.

Answer:

C. activation energy

Question 8