1. Activation energy is the energy move molecules together. b. lost to the environment. c. required to start a reaction. d. released by a reaction. available to do work. а. е. 2. A catalyst lowers the...

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Extracted text: 1. Activation energy is the energy move molecules together. b. lost to the environment. c. required to start a reaction. d. released by a reaction. available to do work. а. е. 2. A catalyst lowers the activation energy by a. reducing the overall temperature. b. destabilizing bonds in the substrate. c. changing the order of amino acids. d. adding energy to the substrate. all of the above. е. 3. Which of these factors does NOT affect the nature of a catalyst? а. extreme temperature b. high level of H* ions c. metal ions d. concentration e. high level of OH¯ ions


Extracted text: 11. Which of the following would indicate that facilitated diffusion was taking place? A) A substance was moving from a region of low concentration into a region of higher concentration. B) Substances were moving against the diffusion gradient. C) A substance was slowing as it moved down its concentration gradient. D) ATP was being rapidly consumed as the substance moved. E) A substance was diffusing much faster than the physical condition indicated it should. 12. Osmosis, the diffusion of water is distinct from the diffusion of oxygen because water is a solvent. b. water is non-polar. water is a large molecule. d. oxygen is a dissolved gas. oxygen is highly polar. а. с. е. 13. Celery stalks that are immersed in fresh water for several hours become stiff and hard. Similar stalks left in a salt solution become limp and soft. From this we can deduce that the cells of the celery stalks are A) hypertonic to both fresh water and the salt solution. B) hypotonic to both fresh water and the salt solution. C) hypertonic to fresh water but hypotonic to the salt solution. D) hypotonic to fresh water but hypertonic to the salt solution. E) isotonic with fresh water but hypotonic to the salt solution. 14. Animal cells are most likely to experience damage from а. an aqueous solution. b. an isotonic solution. a hypotonic solution. a hypertonic solution. None of these. с. d. е. 15. Energy is required to transport molecules if they are charged, like chloride ions. b. against the concentration gradient. c. if they are large, like amino acids. d. dissolved gases needed for respiration. water when it is needed for photosynthesis. а. е.