question 19\nenzymes speed up chemical reactions by.\na breaking the bonds between molecules.\nb lowering…

question 19\nenzymes speed up chemical reactions by.\na breaking the bonds between molecules.\nb lowering the activation energy of the reaction.\nc assembling chemical bonds.\nd increasing the cells metabolism.\ne increasing the activation energy of the reaction.\n\nquestion 20\nanother term for vitamins and minerals is “micronutrients” because they are.\na very small compared to other molecules in the body.\nb only needed in small amounts by our body.\nc used by very few reactions in the body.\nd not very nutritionally dense.\ne used by smaller cells more than by larger cells.

question 19\nenzymes speed up chemical reactions by.\na breaking the bonds between molecules.\nb lowering the activation energy of the reaction.\nc assembling chemical bonds.\nd increasing the cells metabolism.\ne increasing the activation energy of the reaction.\n\nquestion 20\nanother term for vitamins and minerals is “micronutrients” because they are.\na very small compared to other molecules in the body.\nb only needed in small amounts by our body.\nc used by very few reactions in the body.\nd not very nutritionally dense.\ne used by smaller cells more than by larger cells.

Answer

Brief Explanations:

  • For Question 19: Enzymes are biological catalysts. They work by reducing the activation - energy barrier required for a chemical reaction to occur, thus speeding up the reaction.
  • For Question 20: Micronutrients like vitamins and minerals are called so because the body needs them in small quantities for various physiological functions.

Answer:

Question 19: B. lowering the activation energy of the reaction. Question 20: B. only needed in small amounts by our body.