Biology Chapter 7 Practice Questions

5 September 2022
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question
How are proteins transported to their correct location in the cell?
answer
Proteins contain molecular "zip codes" that allow them to be shipped to the correct cellular compartment.
question
What central theme of biology helps explain why various cells can look so different from one another?
answer
Cells correlate structure with function.
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For prokaryotic cells, which statement is correct concerning how the structure of a particular cell component correlates with its function?
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The cell wall is a tough, fibrous layer that protects the cell and gives it shape and rigidity.
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For eukaryotic cells, which answer best describes the function of the indicated component?
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Peroxisome: detox center
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Which features are common to all cells?
answer
the cytoplasm, the plasma membrane, ribosomes, genetic information (DNA) in chromosomes, cytoskeleton
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Large numbers of ribosomes are present in cells that specialize in producing which of the following molecules?
answer
proteins
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Which organelle is the primary site of ATP synthesis in eukaryotic cells?
answer
mitochondrion
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Which of the following cell structures is only found in algal and plant cells?
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chloroplasts
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A prokaryotic cell is distinct from a eukaryotic cell because a prokaryotic cell lacks ____
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a nucleus
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The evolution of eukaryotic cells most likely involved _____.
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endosymbiosis of an aerobic bacterium in a larger host cell—the endosymbiont evolved into mitochondria
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Spherocytosis is a human blood disorder associated with a defective cytoskeletal protein in the red blood cells (RBCs). What do you suspect is the consequence of such a defect?
answer
abnormally shaped RBCs
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Which structure is the site of the synthesis of proteins that may be exported from the cell?
answer
rough ER
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What three distinct elements make up the cytoskeleton in eukaryotic cells?
answer
actin filaments, intermediate filaments, and microtubules
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Which statement most accurately describes what happens to proteins that lack an ER signal sequence?
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They are released into the cytosol.
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What is the correct sequence for secreted protein movement through the endomembrane system?
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ER, cis-Golgi, trans-Golgi, vesicles
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Which plant cell organelle contains its own DNA and ribosomes?
answer
mitochondrion
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Molecules move into and out of the nucleus through the _____
answer
nuclear pores
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Eukaryotic cells manufacture cytoskeletal proteins, which help to maintain cell shapes and functions. What would you predict about these proteins?
answer
They are manufactured on free ribosomes in the cytoplasm.
question
Asbestos is a material that was once used extensively in construction. One risk from working in a building that contains asbestos is the development of asbestosis caused by the inhalation of asbestos fibers. Cells will phagocytize asbestos, but are not able to degrade it. As a result, asbestos fibers accumulate in _____.
answer
lysosomes
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Endocytosis moves materials _____ a cell via _____.
answer
into ... membranous vesicles
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A white blood cell engulfing a bacterium is an example of _____.
answer
phagocytosis
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Which type of organelle or structure is primarily involved in the synthesis of oils, phospholipids, and steroids?
answer
smooth endoplasmic reticulum