Changing the pH of a solution from 7.0 to 4.0

results in a 1000x increase in hydrogen ion concentration

Mass number is defined as

the sum of protons and neutrons

evenly distributed mixture of two or more substances

Water is a polar molecule because

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

Which statement is true?

RNA molecules are made of nucleotides

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Ch 2 Test review 2018-2019

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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 29

Answers

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

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