Biology: The Dynamics of Life, California Edition

Section 2: Water and Diffusion

Water and Diffusion

1.
Which of these statements is true?
A)Atoms in a covalent bond always share electrons equally.
B)Capillary action refers to factors that influence the rate of diffusion.
C)Water resists changes in temperature.
D)Less than 20% of the composition of most organisms is water.
2.
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What is this figure illustrating?
A)polarity
B)dynamic equilibrium
C)a concentration gradient
D)Brownian motion
3.
A polar molecule is a molecule with __________.
A)an unequal distribution of charges
B)no kinetic energy
C)random movement
D)the ability to resists changes in temperature
4.
__________ is the difference in concentration of a substance across spaces, such as with powdered drink mix and water.
A)Concentration gradient
B)Brownian motion
C)Density
D)Polarity
5.
Which of these does NOT affect the rate of diffusion?
A)concentration of substances
B)kinetics
C)pressure
D)temperature
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