Question

7 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. The key concept here is that catalysts speed up reactions by reducing the activation energy, which is the energy needed to start a reaction. Reaction speed is what enzymes increase, not lower. Substrate amount is the reactant quantity, and product amount is the result; enzymes don't lower these. So the correct option is activation energy.

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

Answer:

C. activation energy (assuming the options are labeled A - D with A: reaction speed, B: substrate amount, C: activation energy, D: product amount)

Question 8