HW 8
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HW 8

Course Number: BIO 311C, Spring 2010

College/University: University of Texas

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HW8 Sathasivan (49750) This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page nd all choices before answering. 001 10.0 points Leaves contain openings known as stomata, which allow gas exchange with the outside environment. Which phrase best represents the net ow of gases involved in photosynthesis that would go through a leafs stomata on a sunny day? 1....

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Sathasivan HW8 (49750) This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page nd all choices before answering. 001 10.0 points Leaves contain openings known as stomata, which allow gas exchange with the outside environment. Which phrase best represents the net ow of gases involved in photosynthesis that would go through a leafs stomata on a sunny day? 1. Oxygen moves in while nitrogen moves out. 2. Carbon dioxide moves in while oxygen moves out. correct 3. Water and ozone move in while carbon dioxide moves out. 4. Carbon dioxide and oxygen move in while ozone moves out. Explanation: Carbon dioxide is a reactant in photosynthesis, it needs to move into the plant. Oxygen is a byproduct of photosynthesis, so the plant would release it. 002 10.0 points Which statement accurately reects the process of glycolysis? 1. Glycolysis is most likely one of the earliest of all biochemical reaction to evolve. It uses molecular oxygen; however, it occurs in aerobic environments. 2. Glycolysis is most likely one of the earliest of all biochemical reaction to evolve. It uses molecular oxygen and occurs in the cytoplasm. 3. Glycolysis is most likely one of the earliest of all biochemical reaction to evolve. It uses molecular oxygen and occurs in the mitochondria. 1 4. Glycolysis is most likely one of the earliest of all biochemical reaction to evolve. It does not use molecular oxygen, and all its reactions occur free in the cytoplasm. correct 5. Glycolysis is most likely one of the earliest of all biochemical reactions to evolve. It uses molecular oxygen; however, it occurs in anaerobic environments. Explanation: Glycolysis does not use O2 and occurs in the cytoplasm. 003 10.0 points The light reactions happen in/on and the Calvin cycle happens . 1. chloroplast, cytoplasm 2. stoma, thylakoid 3. thylakoid, stroma correct 4. inner membrane, matrix 5. thylakoid, stomata Explanation: 004 10.0 points Which statement best describes the function of adenosine tri-phosphate (or ATP) in a cell? 1. ATP transports molecules against their concentration gradient in the process of active transport. 2. ATP stores energy produced by respiration for use by proteins around the cell to do cellular work. correct 3. ATP stores the genetic information of the cell. 4. ATP is used by the mitochondria to break down glucose in respiration. Explanation: ATP stores energy in the phosphate bonds. in/on HW8 Sathasivan (49750) gives It energy to proteins to do cellular work when those phosphate bonds are broken, and it is regenerated when mitochondria do cellular respiration. 005 10.0 points Which statement best describes cellular respiration? 1. It is the excretion of materials out of the cells of an organism. 2. It is the conversion of light energy into chemical energy. 3. It is the release of oxygen from the cells of an organism. 4. It is the release of stored chemical energy in food to produce ATP. correct Explanation: Respiration produces energy for the cell (in the form of ATP) by breaking down food. 006 10.0 points During cellular respiration carbon skeletons are broken down and converted to other forms: I) lipids; II) polysaccharides; III) proteins. Which of these are sources of carbon skeleton? 1. II only 2. I only 3. I, II and III correct 4. III only 5. I and II only Explanation: Proteins, polysaccharides and lipids are carbon sources. 007 10.0 points 2 Scientists are trying to determine the function of an organelle in a plant cell. They observe that water and carbon dioxide enter the organelle, and oxygen and glucose exit the organelle. This organelle is most likely 1. a mitochondria. 2. a chloroplast. correct 3. a ribosome. 4. a nucleus. 5. an endoplasmic reticulum. Explanation: These chemicals are the ingredients for photosynthesis. Water and carbon dioxide are reactants, and oxygen and glucose are products. This chemical reaction takes place inside the chloroplast. 008 10.0 points Which group includes the majority of photosynthetic autotrophs? 1. protistans. 2. fungi. 3. animals. 4. bacteria. 5. plants. correct Explanation: The vast majority of plants are photosynthetic autotrophs. 009 10.0 points Muscle cells in athletes often have more mitochondria than do muscle cells in nonathletes. Based on this observation, it can be inferred that the muscle cells in athletes 1. have a greater demand for energy than do the muscle cells of non-athletes. correct HW8 Sathasivan (49750) 2. have a smaller demand for cell proteins than do the muscle cells of non-athletes. 3. have nuclei that contain more DNA than do the muscle cells of non-athletes. 4. reproduce less frequently than do the muscle cells of non-athletes. Explanation: Mitochondria produce energy for the cell. 010 10.0 points When a molecule loses hydrogen atoms (as opposed to hydrogen ions), it becomes 1. hydrolyzed. 2. oxidized. correct 3. reduced. 4. redoxed. 5. hydrogenated. Explanation: 3

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