Biology: The Dynamics of Life, California Edition

Chapter 6: The Chemistry of Life

The Chemistry of Life

1.
Substances such as lemon and tomato, with a pH __________, are considered acidic.
A)equal to 14
B)above 7
C)below 7
D)equal to 0
2.
Which organ in a mammal is responsible for storing glycogen?
A)lungs
B)brain
C)liver
D)bladder
3.
__________ is the difference in concentration of a substance across spaces, such as with powdered drink mix and water.
A)Concentration gradient
B)Polarity
C)Density
D)Brownian motion
4.
A polar molecule is a molecule with __________.
A)an unequal distribution of charges
B)no kinetic energy
C)the ability to resists changes in temperature
D)random movement
5.
Which of these symbols represents copper?
A)Cu
B)Ca
C)Cl
D)Co
6.
Which of these does NOT affect the rate of diffusion?
A)kinetics
B)concentration of substances
C)temperature
D)pressure
7.
Which of these statements is true?
A)Less than 20% of the composition of most organisms is water.
B)Atoms in a covalent bond always share electrons equally.
C)Water resists changes in temperature.
D)Capillary action refers to factors that influence the rate of diffusion.
8.
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What is this figure illustrating?
A)polarity
B)Brownian motion
C)dynamic equilibrium
D)a concentration gradient
9.
__________ results when a multiple substances are combined, with each substance keeping its individual properties.
A)A solution
B)An ion
C)An atom
D)A mixture
10.
Which of these elements is NOT part of a carbohydrate molecule?
A)magnesium
B)carbon
C)hydrogen
D)oxygen
11.
Which of these is a protein?
A)table sugar
B)nucleic acid
C)wax
D)a fingernail
12.
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Which element does this figure represent?
A)neon
B)carbon
C)sodium
D)hydrogen
13.
Which of these is considered to be one indicator of a person's risk of heart disease?
A)high LDL levels
B)the ratio of HDL to LDL
C)the ratio of LDL to HDL
D)low HDL levels
14.
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According to the table, which of these is NOT considered a trace element?
A)cobalt
B)boron
C)oxygen
D)iron
15.
Compounds that have different three-dimensional structures but identical chemical formulas are called __________.
A)isomers
B)acids
C)enzymes
D)carbohydrates
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