bch 3025 module 1 Questions and Correct Answers

A dynamic steady state results when A. a molecule stops being degraded. B. an organism is at equilibrium with its surroundings. C. there is no net energy transfer. D. the rate of intake or synthesis of a molecule equals the rate of its disappearance Answer- Choice D is correct. A dynamic steady state results when the rate of synthesis or intake of a molecule equals the rate of its breakdown, consumption, or conversion into some other product. For example, a dynamic steady state in the blood maintains constant levels of hemoglobin and glucose. An open system is one A. that exchanges neither matter nor energy with its surroundings. B. that exchanges energy but not matter with its surroundings. C. that exchanges both matter and energy with its surroundings. D. that exchanges matter but not energy with its surroundings. Answer- Choice C is correct. If a system exchanges energy and matter with its surroundings, it is called an open system. A living organism, for example, is an open system because it exchanges matter and energy with its surroundings. Which of the following is true about the energy from sunlight? A. All organisms obtain their energy directly from the radiant energy of sunlight. B. Photosynthetic cells use light energy to drive electrons from one molecule to another. C. Photosynthetic cells use light energy to produce CO2 that can be used as energy by non-photosynthetic cells. D. Photosynthetic cells absorb light energy and use it to break down compounds such as starch and sucrose. Answer- Choice B is correct. Photosynthetic cells absorb light energy and use it to drive electrons from water to carbon dioxide to form energy-rich products such as glucose, starch, and sucrose Which of the following is true about carbon bonding