Biology: The Dynamics of Life, North Carolina 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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