1
Bio 117 Chapter 1-4 In-Class Quiz Study Guide
Questions with Answers (100% Correct Answers)
The strength of a covalent bond depends on the number of electrons
shared. N2 shares _____ pairs. Answer: Three
Electrons are attracted to the positively charged nucleus and are held
far away by '_____.' Answer: Energy
Water' ___________ properties allow it to remain liquid at cold
temperatures and lead to surface tension. Answer: Cohesive
Matter is composed of ____ Answer: Atoms
The electrons in the outer most energy level are referred to as ________
electrons and they determine the chemical properties of an element.
Elements 'want' to have a full outer shell of 8. Answer: Valence
The precise location of an electron can not be known but the area
where they are most likely to occur is the orbital. Orbitals can contain
only _____ electrons and can be close or far away from the nucleus.
Answer: Two
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,2
Only ______ elements are found in living things in more than trace
amounts and 4 elements, CHON, make up 96% of the mass of living
things. Answer: Twelve
Associations between the negatively charged O of one molecule and
the positively charged H of another form _________ and account for
much of the organization of living systems. Answer: Hydrogen Bonds
The formation and breaking of chemical bonds is known as a _______.
Answer: Reaction
Some isotopes are more radioactive than others, but all decay at a
constant rate and have constant ______ (the time it takes ½ of the mass
of an isotope to disappear). Answer: Half-life
Molecules consisting only of carbon and hydrogen are _______, which
store tremendous amounts of energy. Answer: Hydrocarbons
Most plant starches exist as _____, which are branched alpha glucose
chains. Answer: Pectins
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, 3
_______ reactions are performed by enzymes within cells and consist of
the removal of an OH group from one monomer and an H atom from
another to form a water molecule. Answer: Dehydration
______ consists of beta glucose and has beta 1-4 linkages. Answer:
Cellulose
In ______, the R group is an H. In all other amino acids the group leads
to chirality. In all living systems, the L form of the amino acid is used.
Answer: Glycerine
High concentrations of salt and vinegar _______ proteins in bacteria and
thus act as good food preservatives. Answer: Denatures
Proteins consist of polymers of _________. The specific chain of amino
acids determines the structure and thus the function of the protein.
Answer: Amino Acids
RNA contains a ______ sugar instead of deoxyribose and uses uracil
instead of thymine. Answer: Ribose
______ pairs with Thymine and Uracil and Cytosine pairs with Guanine,
the most stable hydrogen bond associations. Answer: Adenine
© 2025 All rights reserved
Bio 117 Chapter 1-4 In-Class Quiz Study Guide
Questions with Answers (100% Correct Answers)
The strength of a covalent bond depends on the number of electrons
shared. N2 shares _____ pairs. Answer: Three
Electrons are attracted to the positively charged nucleus and are held
far away by '_____.' Answer: Energy
Water' ___________ properties allow it to remain liquid at cold
temperatures and lead to surface tension. Answer: Cohesive
Matter is composed of ____ Answer: Atoms
The electrons in the outer most energy level are referred to as ________
electrons and they determine the chemical properties of an element.
Elements 'want' to have a full outer shell of 8. Answer: Valence
The precise location of an electron can not be known but the area
where they are most likely to occur is the orbital. Orbitals can contain
only _____ electrons and can be close or far away from the nucleus.
Answer: Two
© 2025 All rights reserved
,2
Only ______ elements are found in living things in more than trace
amounts and 4 elements, CHON, make up 96% of the mass of living
things. Answer: Twelve
Associations between the negatively charged O of one molecule and
the positively charged H of another form _________ and account for
much of the organization of living systems. Answer: Hydrogen Bonds
The formation and breaking of chemical bonds is known as a _______.
Answer: Reaction
Some isotopes are more radioactive than others, but all decay at a
constant rate and have constant ______ (the time it takes ½ of the mass
of an isotope to disappear). Answer: Half-life
Molecules consisting only of carbon and hydrogen are _______, which
store tremendous amounts of energy. Answer: Hydrocarbons
Most plant starches exist as _____, which are branched alpha glucose
chains. Answer: Pectins
© 2025 All rights reserved
, 3
_______ reactions are performed by enzymes within cells and consist of
the removal of an OH group from one monomer and an H atom from
another to form a water molecule. Answer: Dehydration
______ consists of beta glucose and has beta 1-4 linkages. Answer:
Cellulose
In ______, the R group is an H. In all other amino acids the group leads
to chirality. In all living systems, the L form of the amino acid is used.
Answer: Glycerine
High concentrations of salt and vinegar _______ proteins in bacteria and
thus act as good food preservatives. Answer: Denatures
Proteins consist of polymers of _________. The specific chain of amino
acids determines the structure and thus the function of the protein.
Answer: Amino Acids
RNA contains a ______ sugar instead of deoxyribose and uses uracil
instead of thymine. Answer: Ribose
______ pairs with Thymine and Uracil and Cytosine pairs with Guanine,
the most stable hydrogen bond associations. Answer: Adenine
© 2025 All rights reserved
