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Questions and Answers
The % of glucose solution used is ______
40
Diffusion and Osmosis occur through ______ membranes
Nonliving
The Benedict's solution is stored in a ______ bottle
dropper
The vials of mammalian blood are obtained from a biological supply house or ______
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Molasses is added to approximately 5 cm above the thistle tube ______
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The level of the molasses in the tube is marked with a wax ______
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Transport through the plasma membrane occurs in two basic ______
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There are many examples of diffusion in ______ systems
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Potassium per manganate crystals are placed in a 1000 - ml graduated cylinder, and distilled water is added slowly and with as little turbulence as possible to fill to the 1000 - ml mark. Because of its molecular composition, the plasma membrane is selective about what passes through it. It allows nutrients to enter the cell but keeps out undesirable substances. By the same token, valuable cell proteins and other substances are kept within the cell, and excreta or wastes pass _________
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The two important passive processes of membrane transport are ________ and filtration. Diffusion is an important transport process for every cell in the body. By contrast, filtration usually occurs only across capillary walls.
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Molecules possess kinetic energy and are in constant motion. As molecules move about randomly at high speeds, they collide and ricochet off one another, changing direction with each collision. A concentration gradient is present when molecules are unevenly distributed, resulting in an area of higher concentration and an area of lower concentration. Diffusion is the movement of molecules from a region of their higher concentration to a region of their lower concentration. Because the driving force for diffusion is the kinetic energy of the molecules, the speed of diffusion depends on ________
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Because of its molecular composition, the plasma membrane is selective about what passes through it. It allows nutrients to enter the cell but keeps out undesirable substances. By the same token, valuable cell proteins and other substances are kept within the cell, and excreta or wastes pass _________
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