Biology: The Dynamics of Life, North Carolina 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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