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20 Cards in this Set
- Front
- Back
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Maintaining stable internal conditions is...
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Also called homeostasis
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A polar substance...
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Has both slight positive and slight negative charges in opposite areas of the molecule
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Water is a polar substance because...
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the hydrogen atoms have a slight positive charge and the oxygen atom has a slight negative charge
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A phospholipid bilayer has a polar head and a non-polar tail... true or false?
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true
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Osmosis is...
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A way to maintain homeostasis
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Which organelle helps maintain turgor pressure in plant cells?
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Cell membrane, cell wall, vacuole
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Why would water move into a cell?
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To equalize the concentration on both sides of the membrane
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Vegetable cells tend to become more stiff in distilled water because...
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The vacuole fills with water due to the high water concentration outside the cells
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A cell would move water and other substances through its membrane in or out in order to ...
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Maintain homeostasis, gain nutrients from its environment, protect the organism from disease, and carry out its function in the organism
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Why does watering a dried-out plant change its appearance from wilted back to normal?
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Water moves into the plant's cells and fills the vacuole, which puts pressure on the cell wall
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When a concentration gradient exists, particles will move...
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from high to low concentration
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The movement of particles during passive transport is caused by...
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the kinetic energy of the particles
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What is a similarity between diffusion and osmosis?
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Particles move from high to low concentration
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Active transport requires...
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energy input from the cell
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Suppose a cell needs a substance that is already at high concentration in its cytoplasm. What method would the cell most likely use to bring more of the substance into the cell?
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Active transport
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Examples of particles that a cell might move by active transport include...
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Bacterial cells, hormones, very large molecules, particles whose concentration was already high in the space to which they were being moved
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Active transport allows a cell to...
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move substances from low to high concentration, move very large molecules and/or particles through the cell membrane, maintain homeostasis, protect itself from harmful cells
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A cell which carries out a lot of active transport will most likely have a lot of....
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mitochondria
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Phagocytosis is...
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engulfing of particles that will be brought into the cell
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The cell membrane is made up of what molecules?
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cholesterol and phospholipids
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