Micro ch 7-1 quiz – Flashcards
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An organism's survival depends on its ability to move needed materials into the cell across the cell membrane and to transport wastes outside the cell across the cell membrane.
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True
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Simple diffusion is defined as the movement of
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molecules from areas of higher concentration to areas of lower concentration.
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When sugar is mixed with water, equilibrium is reached when
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the dissolved sugar molecules are evenly distributed throughout the solution.
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The rate of diffusion is affected by which of the following?
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A, B and C
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The molecules in a solid lump of sugar do not move.
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False
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Diffusion is one of the processes whereby materials are exchanged between a cell and its environment.
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True
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Macronutrients
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Required in relatively large quantities and play principal roles in cell structure and metabolism
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Micronutrients
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Present in smaller amounts and are involved in enzyme function and maintenance of protein structure
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Nutrition
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Process of acquiring the chemical substances needed for cellular activities
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Nutrient
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Chemical substances used in cellular metabolism and growth
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Which of the following is NOT a characteristic of active transport?
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Use of proteins to move molecules with the concentration gradient
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Which of the following are examples of membrane transport that do NOT require energy from the cell?
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-Diffusion
Active transport
-Osmosis
-Facilitated diffusion
Endocytosis
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Nutrient molecules that contain the basic framework of carbon and hydrogen are called ______ nutrients.
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organic
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Osmosis is best defined as the movement of
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water molecules across a membrane from an area of high water concentration to an area of lower concentration.
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Which of the following will pass through a cell membrane most easily?
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small nonpolar molecules
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A red blood cell placed in a hypertonic medium will
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shrink
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A 5% urea solution is hypotonic to a 10% urea solution.
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True
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If a cell is placed in an isotonic medium, there will be no net movement of water.
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True
