BCOR Final Study Guide Exam Questions/Answers Graded A+
2025/2026
Question: Which element requires two additional electrons to fill the
outermost electron shell?
A. Phosphorus
B. Carbon
C. Nitrogen
D. Oxygen
E. Hydrogen - Answer: D
Question: Which six elements provide most of the mass of the human
body?
A. C, O, Na, H, P, S
B. C, O, N, H, P, S
C. K, O, N, H, P, C
D. C, O, N, H, F, Mg
E. C, O, N, H, P, Mg - Answer: B
Question: A single covalent chemical bond represents the sharing of how
many pairs of electrons?
A. one
B. two
C. three
D. four
E. six - Answer: A
Question: What determines if a molecule is polar, nonpolar, or ionic?
A. The number of protons
B. The bond distances
C. The differences in electronegativities of the atoms
D. The ionic charges
E. The distance of the electrons from the nucleus - Answer: C
Question: Molecules containing a large number of hydroxyl functional
groups are
A. basic
B. structurally less stable than those with fewer hydroxyls
C. complex macromolecules
D. the ionic charges
,E. the distance of the electrons from the nucleus - Answer: A
Question: Why does ice float in liquid water?
A. The high surface tension of liquid water keeps the ice on top
B. The ionic bonds between the molecules in ice prevent the ice from
sinking
C. Ice always has air bubbles and that keeps it afloat
D. Hydrogen bonds stabilize and keep the molecules of ice farther apart
than the water molecules of liquid water
E. The crystalline lattice of ice causes it to be denser than liquid water -
Answer: A
Question: Molecules that are both attracted to water and repel water are
called
A. hydrophilic
B. hydrophobic
C. amphipathic
D. amphoric
E. glycosidic - Answer: C
Question: The pH of a solution increases from pH 5 to pH 7. That means
the concentration of [H+].
A. doubles
B. quadruples
C. decreases 10x
D. decreases 100x
E. increases 20x - Answer: D
Question: Which statement about hydrogen bonds is true?
A. They from between two hydrogen atoms
B. They from only between hydrogen and oxygen atoms within a molecule
C. They form between highly electronegative atoms of one molecule and
hydrogen of another
D. They involve the transfer of electrons
E. They are the strongest bonds because of their length - Answer: C
Question: Which statement about condensation (=dehydration) reactions is
false?
A. They are used in protein synthesis
B. They are used in polysaccharide synthesis
,C. They involve covalent bonds
D. They consume water as a reactant
E. Different dehydration reactions produce different kinds of
macromolecules - Answer: D
Question: Water molecules like to stick together. This is the lay definition
of:
A. surface tension
B. friendship
C. adhesion
D. covalent bonding
E. cohesion - Answer: E
Question: What is NOT a monosaccharide?
A. clugose
B. fructose
C. deoxyribose
D. starch
E. ribose - Answer: D
Question: Sucrose, known as common table sugar, is a
A. hexose
B. lipid
C. simple sugar
D. glucose
E. disaccharide - Answer: E
Question: Lipids form the barriers surrounding various compartments within
an organism. Which property of lipids makes them a good barrier?
A. Many biologically important molecules and ions are not soluble in lipids
B. Lipids are polymers
C. Lipids store energy
D. Lipids are triglycerides
E. Lipids release large amounts of energy when broken down - Answer: A
Question: Olive oil melts at a lower temperature than butter because
A. oils are water soluble
B. butter contains more saturated fats than oils
C. butter contains more unsaturated fats than oils
D. saturated fats have kinks which make them more dense
, E. all of the above - Answer: B
Question: Nucleotides in RNA are connected to one another in the
polynucleotide chain by
A. covalent bonds between bases
B. covalent bonds between sugars
C. covalent bonds between sugars and phosphate
D. hydrogen bonds between purines
E. hydrogen bonds between phosphates - Answer: C
Question: RNA differs from DNA in that RNA
A. contains uracil instead of thymine
B. is single-stranded, whereas DNA is double-stranded
C. is an intermediate in the information transfer, whereas DNA encodes
hereditary information
D. contains ribose, whereas DNA contains deoxyribose
E. all of the above - Answer: E
Question: The 5'-carbon of deoxyribose in DNA is attached to
A. adenine
B. a phosphate group
C. guanine
D. a pyrimidine
E. hydrogen - Answer: B
Question: Two complimentary nucleotides are connected by __ bonds
A. hydrogen
B. ionic
C. peptide
D. phosphodiester
E. covalent - Answer: A
Question: When an egg is exposed to extreme heat why does it turn from a
liquid substance into a solid substance?
A. Heat caused rapidly moving molecules to move further apart even after
the heat is removed
B. Proteins in the egg have become denatured and lose secondary and
tertiary structures
C. The fats in the eggs have become saturated
D. Heat led to hydrolysis of peptide bonds
2025/2026
Question: Which element requires two additional electrons to fill the
outermost electron shell?
A. Phosphorus
B. Carbon
C. Nitrogen
D. Oxygen
E. Hydrogen - Answer: D
Question: Which six elements provide most of the mass of the human
body?
A. C, O, Na, H, P, S
B. C, O, N, H, P, S
C. K, O, N, H, P, C
D. C, O, N, H, F, Mg
E. C, O, N, H, P, Mg - Answer: B
Question: A single covalent chemical bond represents the sharing of how
many pairs of electrons?
A. one
B. two
C. three
D. four
E. six - Answer: A
Question: What determines if a molecule is polar, nonpolar, or ionic?
A. The number of protons
B. The bond distances
C. The differences in electronegativities of the atoms
D. The ionic charges
E. The distance of the electrons from the nucleus - Answer: C
Question: Molecules containing a large number of hydroxyl functional
groups are
A. basic
B. structurally less stable than those with fewer hydroxyls
C. complex macromolecules
D. the ionic charges
,E. the distance of the electrons from the nucleus - Answer: A
Question: Why does ice float in liquid water?
A. The high surface tension of liquid water keeps the ice on top
B. The ionic bonds between the molecules in ice prevent the ice from
sinking
C. Ice always has air bubbles and that keeps it afloat
D. Hydrogen bonds stabilize and keep the molecules of ice farther apart
than the water molecules of liquid water
E. The crystalline lattice of ice causes it to be denser than liquid water -
Answer: A
Question: Molecules that are both attracted to water and repel water are
called
A. hydrophilic
B. hydrophobic
C. amphipathic
D. amphoric
E. glycosidic - Answer: C
Question: The pH of a solution increases from pH 5 to pH 7. That means
the concentration of [H+].
A. doubles
B. quadruples
C. decreases 10x
D. decreases 100x
E. increases 20x - Answer: D
Question: Which statement about hydrogen bonds is true?
A. They from between two hydrogen atoms
B. They from only between hydrogen and oxygen atoms within a molecule
C. They form between highly electronegative atoms of one molecule and
hydrogen of another
D. They involve the transfer of electrons
E. They are the strongest bonds because of their length - Answer: C
Question: Which statement about condensation (=dehydration) reactions is
false?
A. They are used in protein synthesis
B. They are used in polysaccharide synthesis
,C. They involve covalent bonds
D. They consume water as a reactant
E. Different dehydration reactions produce different kinds of
macromolecules - Answer: D
Question: Water molecules like to stick together. This is the lay definition
of:
A. surface tension
B. friendship
C. adhesion
D. covalent bonding
E. cohesion - Answer: E
Question: What is NOT a monosaccharide?
A. clugose
B. fructose
C. deoxyribose
D. starch
E. ribose - Answer: D
Question: Sucrose, known as common table sugar, is a
A. hexose
B. lipid
C. simple sugar
D. glucose
E. disaccharide - Answer: E
Question: Lipids form the barriers surrounding various compartments within
an organism. Which property of lipids makes them a good barrier?
A. Many biologically important molecules and ions are not soluble in lipids
B. Lipids are polymers
C. Lipids store energy
D. Lipids are triglycerides
E. Lipids release large amounts of energy when broken down - Answer: A
Question: Olive oil melts at a lower temperature than butter because
A. oils are water soluble
B. butter contains more saturated fats than oils
C. butter contains more unsaturated fats than oils
D. saturated fats have kinks which make them more dense
, E. all of the above - Answer: B
Question: Nucleotides in RNA are connected to one another in the
polynucleotide chain by
A. covalent bonds between bases
B. covalent bonds between sugars
C. covalent bonds between sugars and phosphate
D. hydrogen bonds between purines
E. hydrogen bonds between phosphates - Answer: C
Question: RNA differs from DNA in that RNA
A. contains uracil instead of thymine
B. is single-stranded, whereas DNA is double-stranded
C. is an intermediate in the information transfer, whereas DNA encodes
hereditary information
D. contains ribose, whereas DNA contains deoxyribose
E. all of the above - Answer: E
Question: The 5'-carbon of deoxyribose in DNA is attached to
A. adenine
B. a phosphate group
C. guanine
D. a pyrimidine
E. hydrogen - Answer: B
Question: Two complimentary nucleotides are connected by __ bonds
A. hydrogen
B. ionic
C. peptide
D. phosphodiester
E. covalent - Answer: A
Question: When an egg is exposed to extreme heat why does it turn from a
liquid substance into a solid substance?
A. Heat caused rapidly moving molecules to move further apart even after
the heat is removed
B. Proteins in the egg have become denatured and lose secondary and
tertiary structures
C. The fats in the eggs have become saturated
D. Heat led to hydrolysis of peptide bonds
