Early Exam 2 - Version – EarlyExam2 – Sathasivan –...

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Unformatted text preview: Version – EarlyExam2 – Sathasivan – (49750) 1 This print-out should have 42 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. PLEASE CIRCLE THE CORRECT AN- SWERS ON THE EXAM AS THIS WILL BE HAND GRADED. DO NOT DISCUSS THIS EXAM WITH ANYONE UNTIL THE COMING WEEKEND. 001 10.0 points In which of the following there is a mis- match between the organelle and the func- tions shown against it? 1. cell wall : support, protection 2. ribosomes : site of protein synthesis 3. mitochondria : formation of ATP 4. chromosomes : genetic control of infor- mation 5. chloroplasts : chief site of cellular respira- tion correct Explanation: The chloroplasts convert light to chemical energy in the presence of sunlight and CO 2 . They are not the sites for cellular respiration. 002 10.0 points How does the surface area-to-volume ratio of a 1-mm cube compare to the surface area-to- volume ratio of a 3-mm cube? 1. The 3 mm cube has a higher ratio. 2. Increasing the volume increases the ra- tio. 3. The ratio does not change. 4. The ratio decreases as the cube becomes larger. correct 5. The ratio increases as the cube becomes larger. Explanation: 1-mm cube: Surface area = (Length) × (Width) × (6 sides) = 6 mm 2 Volume = (Length) × (Width) × (Height) = 1 mm 3 3-mm cube: Surface area = (3 mm) × (3 mm) × 6 sides = 54 mm 2 Volume = (3 mm) × (3 mm) × (3 mm) = 27 mm 3 Ratio of the 1-mm cube (6:1) is 3 times larger than the 3-mm cube (2:1). 003 10.0 points The DNA of mitochondria 1. is needed to hydrolyze monomers. 2. is used to make proteins needed for cellu- lar respiration. correct 3. controls the cell’s activities. 4. directs photosynthesis. 5. synthesizes polysaccharides for the plant cell wall. Explanation: 004 10.0 points Placing a plant cell in a hypotonic solution will cause the cell to 1. not change at all. 2. swell. correct 3. shrivel. 4. divide. 5. burst. Explanation: In hypotonic solutions, there is less solute (and therefore more water) outside the cell; therefore, water will rush into the cell. Plant cells prefer this environment, and use the wa- Version – EarlyExam2 – Sathasivan – (49750) 2 ter to keep the stem upright and rigid. Unlike animal cells, plant cells have cell walls to pre- vent the cell from bursting. 005 10.0 points Plant and animal cells are similar in appear- ance. One difference is that 1. only animal cells have mitochondria. 2. plant cells lack a cytoskeleton. 3. only plant cells have peroxisomes. 4. only animal cells contain centrioles. cor- rect 5. plant cells have a cell wall instead of the plasma membrane found in animal cells. Explanation: Cellular structures unique to plant cells in- clude the cell wall and the chloroplasts. An- imal cells contain centrioles, which are not found in plant cells....
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This note was uploaded on 11/17/2010 for the course BIO 311C taught by Professor Satasivian during the Spring '08 term at University of Texas.

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Early Exam 2 - Version – EarlyExam2 – Sathasivan –...

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