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Biology Laboratory Manual, 6/e

Darrell S. Vodopich, Baylor University
Randy Moore, University of Minnesota--Minneapolis

Exercise 8-Diffusion and Osmosis

Choose the one answer that best answers the question.


1	The process of ___ was demonstrated using a suspension of small particles. Individual particles appear to vibrate due to collisions with moving molecules.
		A)	osmosis
		B)	Brownian movment
		C)	diffusion
		D)	lysis


2	Passive, directional movement of molecules is part of the process called ___.
		A)	free energy
		B)	Brownian movement
		C)	diffusion
		D)	lysis


3	What is free energy?
		A)	the net movement of molecules
		B)	random motion of molecules
		C)	the energy available in a system to do work
		D)	the movement associated with polar molecules


4	The general structure of membranes allows membranes to be selective about which molecules pass through the membrane. These membranes are ___.
		A)	impermeable
		B)	permeable
		C)	differentially permeable
		D)	polar


5	Which types of molecules usually will not pass through the membrane's lipid core?
		A)	permeable
		B)	nonpolar
		C)	small
		D)	polar


6	Phenolphthalein is an indicator for ___.
		A)	pH
		B)	sugar
		C)	starch
		D)	salt


7	Molecular motion stops when the diffusion rate is ___.
		A)	zero
		B)	greater than one
		C)	less than one
		D)	none of the above


8	Solutions having a lower concentration of solutes than the surrounding environment are ___ to the environment.
		A)	hypotonic
		B)	hypertonic
		C)	isotonic
		D)	polar


9	A cell that is hypertonic...
		A)	will experience a net movement of water into the cell from the surrounding environment.
		B)	has a lower concentration of solutes than the surrounding environment.
		C)	will experience a net movement of water out of the cell into the surround environment.
		D)	is in danger of plasmolysis.


10	What is the term for a situation in which water osmoses out of a cell and into the surrounding environment?
		A)	lysis
		B)	plasmolysis
		C)	hemolysis
		D)	hydrostatic pressure increase

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