Intro to Biology Chapter 3 questions – Flashcards
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What does the cell theory state?
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All living things are made of cells and All cells come from existing cells
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Which of the following statements best explains why bacteria are considered living organisms?
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They are made of cells.
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Which of the following statements is TRUE about prokaryotes and eukaryotes?
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Prokaryotes are smaller and lack the internal compartments that eukaryotes have.
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Which of the following is associated with all cells?
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all
cell membrane
ribosomes
DNA
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Bacteria have _______ cells, defined by the _______.
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prokaryotic; absence of organelles
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Which of the following is associated with eukaryotic cells but not with prokaryotic cells?
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nucleus
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Which of the following accurately compares prokaryotic and eukaryotic cells?
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Prokaryotic and eukaryotic cells contain the same form of genetic information.
Prokaryotic and eukaryotic cells both contain ribosomes to effectively use their genetic information,
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You find a single-cell organism with a cell wall in the soil of a forest—can this organism be an animal? Which of the following facts would convince you that the organism is a bacterium and not a plant?
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The cell wall is made of peptidoglycan.
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The two major components of cell membranes are _______ and _______.
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phospholipids; proteins
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If a solute is moving through a phospholipid bilayer from an area of higher concentration to an area of lower concentration without the assistance of a protein, the manner of transport must be _______.
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simple diffusion
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Water is moving across a membrane from solution A into solution B. What can you infer?
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Solution A must have a lower solute concentration than Solution B
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Which of the following types of transport are most closely related in terms of the energy requirements for moving material across a membrane?
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simple diffusion and facilitated diffusion
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Which of the following accurately describes why specific material uses a protein to cross the membrane?
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The hydrophobic core of a membrane will only allow hydrophobic substances to cross without a membrane protein
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Sugars are large, hydrophilic molecules that are important energy sources for cells. How can they enter cells from an environment with a very high concentration of sugar?
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by active transport
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Many foods—for example, bacon and salt cod—are preserved with high concentrations of salt. How can high concentrations of salt inhibit the growth of bacteria?
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High salt is hypertonic and causes the bacteria to shrink because water leaves the bacterial cell.
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Penicillin interferes with __________________, causing bacteria to die from ______________.
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cell wall synthesis; swelling and rupturing of the cell
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Although both humans and bacteria have ribosomes, streptomycin—which blocks ribosome function—does not harm a human who ingests it. Why?
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Human cells have ribosomes that do not bind streptomycin; only prokaryotic ribosomes are affected by this drug.
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Gram-positive and Gram-negative bacteria are most commonly differentiated in the laboratory by __________.
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whether or not a dye is trapped within the cells during the Gram staining procedure
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Which of the following cellular components would not be a good target for an antibiotic?
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phospholipids
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Fungi are eukaryotic organisms. Scientists have found it more challenging to develop treatments for fungal infections (e.g., yeast infections, athlete's foot, and certain nail infections) than for bacterial infections. Why is this so?
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The potential targets found in these cells closely resemble our own eukaryotic cells
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Which of the following is NOT a cytoskeletal fiber in eukaryotic cells?
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macrotubules
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Insulin is a protein hormone secreted by certain pancreatic cells into the bloodstream. Which of the following organelles are involved in the synthesis and secretion of insulin?
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all
rough ER
Golgi apparatus
Ribosomes
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Which of the following combinations INCORRECTLY matches an organelle with its function?
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lysosome: internal support; cell and organelle movement
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Some inherited syndromes, for example MERRF (myoclonic epilepsy with ragged red fibers), interfere with the function of mitochondria. From what you know about mitochondria, why do you think the muscles and the nervous system are the predominant tissues affected in MERRF?
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Mitochondria are the most metabolically active and require the most energy
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The "endosymbiotic hypothesis" is a concept that __________.
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explains how eukaryotic cells might have evolved mitochondria and chloroplasts within their cells.
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Which organelle would cause the most damage to cytoskeletal fibers in the cytoplasm if its contents were to leak into the cytoplasm?
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lysosome
