Which statement is true?

RNA molecules are made of nucleotides

Mass number is defined as

the sum of protons and neutrons

Changing the pH of a solution from 7.0 to 4.0

results in a 1000x increase in hydrogen ion concentration

Water is a polar molecule because

there is an uneven dist. of electrons between O and H atoms

evenly distributed mixture of two or more substances

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Biology Ch 2 Miller & Levine

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Quiz corresponds to Ch 2 of the Prentice Hall Biology text by Miller & Levine (dragonfly edition)

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Questions 30

Answers

1
The study of the chemistry of living things is called
analytical chemistry
biochemistry
biogeochemistry
physical chemistry
2
Of the following acidic substances which is the weakest acid?
sulfuric acid (pH 1.2)
hydrochloric acid (pH 1.0)
rainwater (pH 6.2)
tomatoes (pH 4.2)
3
Which element is NOT considered essential to life?
phosphorous
carbon
helium
nitrogen
4
Which statement is true?
RNA molecules are made of nucleotides
Simple sugars are made of polysaccharides
Glycerol is made of fatty acids
Amino acids are made of proteins
5
The monomer of nucleic acids are referred to as
Neutratides
Nucleotides
Electrotides
Laurentides
6
Isotopes are atoms of the same element with the same number of protons and
a different number of molecules
the same number of neutrons
a different number of electrons
a different number of neutrons
7
A covalent bond is formed as the result of
transferring protons
sharing an electron pair
transferring electrons
sharing a proton pair
8
What is the term used to describe the energy needed to get a reaction started?
chemical energy
cohesion energy
activation energy
adhesion energy
9
Ice floats on water because
water expands when it freezes
water shrinks when it freezes
ice has a higher density than water
of prohesion
10
What term describes a substance formed by two or more elements in definite proportions?
enzyme
isotope
compound
nucleus
11
When salt is dissolved in water, water is the
solution
solvent
reactant
solute
12
These biological molecules are used for long term energy storage
Carbohydrates
Proteins
Nucleic Acids
Lipids
13
What type of electrons are available to form bonds?
ionic
valence
nucleus
covalent
14
Mass number is defined as
the sum of protons and neutrons
the sum of neutrons and electrons
the sum of electrons and protons
the sum of electrons and protons
15
Which of the following is NOT a function of proteins?
help to fight disease
control the rate of reactions and regulate cell processes
build tissues such as bone and muscle
store and transmit heredity
16
Changing the pH of a solution from 7.0 to 4.0
results in a 100x increase in hydrogen ion concentration
results in a 1000x decrease in hydrogen ion concentration
results in a 1000x increase in hydrogen ion concentration
results in a 100x decrease in the hydrogen ion concentration
17
Enzymes can be regulated by all of the following EXCEPT
other proteins
changes in temperature
changes in density
changes in pH
18
The ability of water to stick to itself is called
cohesion
prohesion
adhesion
collation
19
Of the following what is NOT a nucleotide of nucleic acids?
Adenine
Guanine
Promine
Cytosine
20
Water is a polar molecule because
there is an even dist. of electrons between O and H atoms
there is an uneven dist. of electrons between H atoms only
there is an uneven dist. of electrons between O atoms only
there is an uneven dist. of electrons between O and H atoms
21
In a chemical reaction, a reactant binds to an enzyme at a region known as the
active site
product
substrate
catalyst
22
The space surrounding the nucleus of an atom contains
ions
electrons
protons
neutrons
23
A monosaccharide is a
nucleic acid
lipid
carbohydrate
protein
24
What type of ion forms when an atom loses electrons?
possibly positive or negative
negative
neutral
positive
25
The structure of lipids include
glycerol and lean acids
glycerine and fatty acids
glycerol and fatty acids
glycine and fatty acids
26
A solution is a(an)
chemical reaction
evenly distributed mixture of two or more substances
breaking of a chemical bond
combination of two or more solids
27
Chemical reactions that release energy
will always explode
often occur spontaneously
will not occur
will always absorb energy
28
Water that will not stick to a newly waxed automobile is due to
adhesion
prohesion
coenzyme action
capillary action
29
An atom of magnesium (atomic number 12) with a mass number of 24 has how many neutrons?
13
12
11
10
30
Enzymes affect the reactions in living cells by changing the
temperature of the reaction
speed of the reaction
pH of the reaction
products of the reaction

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