BIOLOGY EXAM 2 STUDY QUESTIONS AND
ACCURATE SOLUTIONS RATED A
Sugars dissolve well in water and are therefore called ___________
substances
A. covalent
B. hydrophobic
C. ionic
D. hydrophilic
E. hydrogen
D. hydrophilic
In a covalent bond
A. atoms share protons
B. atoms are repelled by each other
C. atoms of opposite charges attract each other
D. atoms share neutrons
E. atoms share electrons
E. atoms share electrons
Within a single molecule of water, _________ bonds are formed between
oxygen and hydrogen
A. nuclear
B. hydrophobic
C. hydrogen
D. ionic
E. covalent
E. covalent
The primary building block (monomer) of proteins is
A. an amino acid
B. a nucleotide
C. a glucose molecule
,D. four interconnected rings
E. a fatty acid
A. an amino acid
Ice floats on liquid water because
A. the molecules are closer together in ice that in liquid water
B. ice is denser than liquid water
C. water vapor is less dense than liquid water
D. convection currents caused by temperature differences push upwards on
the ice
E. the molecules are farther apart in ice than in liquid water
E. the molecules are farther apart in ice than in liquid water
How are the monomers in proteins joined?
A. peptide bonds between carbohydrates
B. peptide bonds between amino acids
C. peptide bonds between nucleotides
D. phosphodiester bonds between nucleotides
E. phosphodiester bonds between amino acids
B. peptide bonds between amino acids
Blood pH is closely maintained at a pH of 7.4. A patient whose blood pH
drops below 7.35 is suffering from metabolic acidosis and can go into a
coma. What happens to the concentration of H+ ions in a patient with a
blood pH of 6.4?
A. H+ concentration is increased 2-fold
B. H+ concentration is decreased 10-fold
C. H+ concentration is decreased 2-fold
D. H+ concentration is decreased 4-fold
E. H+ concentration is increased 10-fold
E. H+ concentration is increased 10-fold
Two hydrogen atoms and an oxygen atom bonded together form
A. an atom, but not a molecule or compound
B. an atom and a molecule
,C. a molecule, but not a compound
D. a compound, but not a molecule
E. a molecule and a compound
E. a molecule and a compound
A hydrogen bond
A. does not occur in living organisms
B. forms between atoms having the same electronegativity
C. is generally a strong bond
D. is a specialized type of covalent bond
E. does not require electron transfer
E. does not require electron transfer
Which of the following is not a lipid?
A. a wax
B. a sterol
C. a triglyceride
D. a starch molecule
E. a phospholipid
D. a starch molecule
_________ bonds are formed between monomers to form a polymer
A. hydrogen
B. covalent
C. ionic
D. nuclear
E. hydrophobic
B. covalent
Evaporation is
A. all answers are correct
B. the conversion of a solid into a vapor
C. the conversion of a liquid into a vapor
D. the conversion of a vapor into a solid
E. the conversion of a vapor into a liquid
, C. the conversion of a liquid into a vapor
An ionic bond is a bond in which
A. atoms share neutrons
B. atoms share electrons
C. atoms are repelled by each other
D. atoms of opposite charges attract each other
E. atoms share protons
D. atoms of opposite charges attract each other
If a covalent bond is polar
A. the bond is weak in strength
B. protons are shared by atoms
C. electronegativity of atoms is unequal in their pull on electrons
D. it will not form in living organisms
E. electrons are not shared by atoms
C. electronegativity of atoms is unequal in their pull on electrons
The primary building block (monomer) of nucleic acids is
A. an amino acid
B. a nucleotide
C. a fatty acid
D. a glucose molecule
E. four interconnected carbon rings
B. a nucleotide
Scientists use carbon-dating to determine the age of fossils. 14C is a rare
isotope of carbon that has a half-life of 5730 years and decays into 14N.
By measuring the amount of 14C remaining in a fossil, scientists can
estimate when the organism died to within 60,000 years. The atomic
numbers of C is 6 and of N is 7
The most common isotope of carbon is 12C. 14C has _________ than 12C
A. more electrons
B. more protons
ACCURATE SOLUTIONS RATED A
Sugars dissolve well in water and are therefore called ___________
substances
A. covalent
B. hydrophobic
C. ionic
D. hydrophilic
E. hydrogen
D. hydrophilic
In a covalent bond
A. atoms share protons
B. atoms are repelled by each other
C. atoms of opposite charges attract each other
D. atoms share neutrons
E. atoms share electrons
E. atoms share electrons
Within a single molecule of water, _________ bonds are formed between
oxygen and hydrogen
A. nuclear
B. hydrophobic
C. hydrogen
D. ionic
E. covalent
E. covalent
The primary building block (monomer) of proteins is
A. an amino acid
B. a nucleotide
C. a glucose molecule
,D. four interconnected rings
E. a fatty acid
A. an amino acid
Ice floats on liquid water because
A. the molecules are closer together in ice that in liquid water
B. ice is denser than liquid water
C. water vapor is less dense than liquid water
D. convection currents caused by temperature differences push upwards on
the ice
E. the molecules are farther apart in ice than in liquid water
E. the molecules are farther apart in ice than in liquid water
How are the monomers in proteins joined?
A. peptide bonds between carbohydrates
B. peptide bonds between amino acids
C. peptide bonds between nucleotides
D. phosphodiester bonds between nucleotides
E. phosphodiester bonds between amino acids
B. peptide bonds between amino acids
Blood pH is closely maintained at a pH of 7.4. A patient whose blood pH
drops below 7.35 is suffering from metabolic acidosis and can go into a
coma. What happens to the concentration of H+ ions in a patient with a
blood pH of 6.4?
A. H+ concentration is increased 2-fold
B. H+ concentration is decreased 10-fold
C. H+ concentration is decreased 2-fold
D. H+ concentration is decreased 4-fold
E. H+ concentration is increased 10-fold
E. H+ concentration is increased 10-fold
Two hydrogen atoms and an oxygen atom bonded together form
A. an atom, but not a molecule or compound
B. an atom and a molecule
,C. a molecule, but not a compound
D. a compound, but not a molecule
E. a molecule and a compound
E. a molecule and a compound
A hydrogen bond
A. does not occur in living organisms
B. forms between atoms having the same electronegativity
C. is generally a strong bond
D. is a specialized type of covalent bond
E. does not require electron transfer
E. does not require electron transfer
Which of the following is not a lipid?
A. a wax
B. a sterol
C. a triglyceride
D. a starch molecule
E. a phospholipid
D. a starch molecule
_________ bonds are formed between monomers to form a polymer
A. hydrogen
B. covalent
C. ionic
D. nuclear
E. hydrophobic
B. covalent
Evaporation is
A. all answers are correct
B. the conversion of a solid into a vapor
C. the conversion of a liquid into a vapor
D. the conversion of a vapor into a solid
E. the conversion of a vapor into a liquid
, C. the conversion of a liquid into a vapor
An ionic bond is a bond in which
A. atoms share neutrons
B. atoms share electrons
C. atoms are repelled by each other
D. atoms of opposite charges attract each other
E. atoms share protons
D. atoms of opposite charges attract each other
If a covalent bond is polar
A. the bond is weak in strength
B. protons are shared by atoms
C. electronegativity of atoms is unequal in their pull on electrons
D. it will not form in living organisms
E. electrons are not shared by atoms
C. electronegativity of atoms is unequal in their pull on electrons
The primary building block (monomer) of nucleic acids is
A. an amino acid
B. a nucleotide
C. a fatty acid
D. a glucose molecule
E. four interconnected carbon rings
B. a nucleotide
Scientists use carbon-dating to determine the age of fossils. 14C is a rare
isotope of carbon that has a half-life of 5730 years and decays into 14N.
By measuring the amount of 14C remaining in a fossil, scientists can
estimate when the organism died to within 60,000 years. The atomic
numbers of C is 6 and of N is 7
The most common isotope of carbon is 12C. 14C has _________ than 12C
A. more electrons
B. more protons
