Lecture4Key - Lecture 4 Review Problems Key 1....

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Unformatted text preview: Lecture 4 Review Problems Key 1. Which structure is generally present in both prokaryotic cells and eukaryotic plant cells? a. Chloroplasts b. Cell wall c. Nucleus d. Mitochondria e. Microtubules 2. The major factor limiting cell size is the a. concentration of water in the cytoplasm. b. need for energy. c. presence of membrane ­enclosed organelles. d. ratio of surface area to volume. e. composition of the plasma membrane. 3. Which statement about mitochondria is not true? a. The inner mitochondrial membrane folds to form cristae. b. The outer membrane is relatively permeable to macromolecules. c. Mitochondria are green because they contain chlorophyll. d. Fuel molecules from the cytosol are used for respiration in mitochondria. e. ATP is synthesized in mitochondria. 4. The Golgi apparatus a. is found only in animals. b. is found in prokaryotes. c. is the appendage that moves a cell around in its environment. d. is a site of rapid ATP production. e. modifies and packages proteins. 5. Which structure is not surrounded by one or more membranes? a. Ribosome b. Chloroplast c. Mitochondrion d. Peroxisome e. Vacuole 6. Plant cells do not have lysosomes. Which of the following structures likely fulfills the function of lysosomes in plant cell? a. Vacuole b. Peroxisome c. Smooth endoplasmic reticulum d. Golgi apparatus e. Chloroplasts 7. Which of the following statements about the nucleus in animal cells is false? a. The nucleus is surrounded by a double membrane system. b. DNA replication takes place in the nucleus. c. The nucleus is the site of protein synthesis. d. DNA in the nucleus combines with proteins. e. The nucleolus is located in the nucleus. 8. Nucleic acids are not found in which of the following structures? a. The nucleus b. Mitochondria c. Plant vacuoles d. Ribosomes e. Prokaryotic cells 9. Some proteins that are on the surface of mammalian cells contain carbohydrates. These proteins are synthesized by _______ and the sugars added in the _______. a. mitochondrial ribosomes; smooth endoplasmic reticulum b. the rough endoplasmic reticulum; Golgi apparatus c. cytoplasmic ribosomes; smooth endoplasmic reticulum d. Golgi apparatus; rough endoplasmic reticulum e. cytoplasmic ribosomes; plasma membrane 10. Which of the following structures is involved with the movement of organelles within a cell? a. Golgi apparatus b. Endoplasmic reticulum c. Mitochondrion d. Microtubules e. Intermediate filaments 11. Which of the following organelles were probably once independent prokaryote organisms? a. Mitochondria and lysosomes b. Mitochondria and chloroplasts c. Chloroplasts and Golgi apparatus d. Golgi apparatus and ribosomes e. Ribosomes and lysosomes 12. The overall shape of a cell is determined by its a. cell membrane. b. cytoskeleton. c. nucleus. d. cytosol. e. endoplasmic reticulum. 13. Microtubules are made of a. actin, and they function in locomotion. b. tubulin, and they are essential in chromosome distribution during mitosis. c. tubulin, and they are found in microvilli. d. actin, and they function to change cell shape. e. polysaccharides, and they function in locomotion. 14. Which of the following organelles is found at the base of every eukaryotic cilium and flagellum? a. Centriole b. Basal body c. Nucleolus d. Flagellum e. Microvillus 15. The organelle shown below is found in all cells but is most numerous in cells requiring a large amount of energy (e.g., liver cells). What is the name of this organelle? a. Lysosome b. Golgi apparatus c. Rough endoplasmic reticulum d. Mitochondrion e. Chloroplast 15. Nuclear DNA exists as a complex of proteins called _______ that condenses into _______ during cellular division. a. chromosomes; chromatin b. chromatids; chromosomes c. chromophors; chromatin d. chromatin; chromosomes e. None of the above 16. Explain the significance of organelles. What are the costs and benefits of having large compartmentalized cells? Answer: Organelles allow different metabolic environments to exist in the same cell. This partitioning of jobs allows for greater specialization but comes at an energy cost. Eukaryotic cells are more energy expensive. 17. Explain the significance of organelles. What are the costs and benefits of having large compartmentalized cells? Answer: Organelles allow different metabolic environments to exist in the same cell. This partitioning of jobs allows for greater specialization but comes at an energy cost. Eukaryotic cells are more energy expensive ...
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This note was uploaded on 02/09/2012 for the course BIOLOGY 102 taught by Professor Anderson during the Spring '11 term at Harvard.

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