PORTAGE LEARNING CHEM 210 MODULE 1 PROBLEM
SET QUESTIONS WITH ANSWERS AND EXPLANATIONS
Question 1.
Which observation would best demonstrate tetrahedral carbon geometry?
A. The central carbon in methane displaying four equivalent single bonds.
B. Breakdown of engulfed or damaged macromolecular material in an acidic compartment.
C. C2H6O representing the atom counts in an ethanol molecule.
D. The -COOH group of acetic acid.
Correct Answer: A. The central carbon in methane displaying four equivalent
single bonds.
Explanation: The most important distinction is that The central carbon in methane
displaying four equivalent single bonds. is a representative example of tetrahedral carbon
geometry. A carbon with four electron domains and four single bonds is approximately
tetrahedral with bond angles near 109.5 degrees. The other options were drawn from
related module concepts, but each illustrates a different biochemical feature. Matching the
defining feature to the example is the most reliable way to solve this type of problem.
Question 2.
A student is distinguishing carbon dioxide geometry from alkyne. Which statement
correctly describes carbon dioxide geometry?
A. An ether contains an oxygen single-bonded to two carbon groups.
B. Carbon dioxide is linear around its central carbon because the two double bonds create
two electron domains.
C. A carbon with four electron domains and four single bonds is approximately tetrahedral
with bond angles near 109.5 degrees.
D. An alkyne is a hydrocarbon that contains at least one carbon-carbon triple bond.
Correct Answer: B. Carbon dioxide is linear around its central carbon because
the two double bonds create two electron domains.
Explanation: This choice is correct because carbon dioxide geometry should be defined
as follows: Carbon dioxide is linear around its central carbon because the two double
bonds create two electron domains. This differs from alkyne, which is described by a
separate set of properties. The distinction matters because substituting one term for the
other can change the predicted structure, location, or biochemical outcome. The correct
option therefore preserves the specific meaning of carbon dioxide geometry.
,Question 3.
Consider this clue: Oxidation of fuels and oxidative phosphorylation occurring within a
double-membrane organelle. Which concept is being illustrated?
A. smooth endoplasmic reticulum
B. rough endoplasmic reticulum
C. nucleus
D. mitochondrion
Correct Answer: D. mitochondrion
Explanation: The defining feature is that the clue points to mitochondrion. A
mitochondrion is a eukaryotic organelle central to aerobic energy metabolism and ATP
production. The example given - Oxidation of fuels and oxidative phosphorylation
occurring within a double-membrane organelle. - is a direct application of that definition.
The alternative terms describe different structures, processes, or roles and therefore do
not fit the clue as closely.
Question 4.
A student is distinguishing carboxyl group from carbonyl group. Which statement correctly
describes carboxyl group?
A. A hydroxyl group is an -OH functional group commonly found in alcohols and many
carbohydrates.
B. A carbonyl group consists of a carbon double-bonded to oxygen and occurs in
aldehydes, ketones, and other compounds.
C. A carboxyl group contains a carbonyl and hydroxyl on the same carbon and can donate
a proton.
D. An ester contains a carbonyl carbon bonded to an oxygen that is also bonded to another
carbon group.
Correct Answer: C. A carboxyl group contains a carbonyl and hydroxyl on the
same carbon and can donate a proton.
Explanation: The correct interpretation is that carboxyl group should be defined as
follows: A carboxyl group contains a carbonyl and hydroxyl on the same carbon and can
donate a proton. This differs from carbonyl group, which is described by a separate set of
properties. The distinction matters because substituting one term for the other can change
the predicted structure, location, or biochemical outcome. The correct option therefore
preserves the specific meaning of carboxyl group.
,Question 5.
Which option provides the strongest example of lysosome?
A. Breakdown of engulfed or damaged macromolecular material in an acidic compartment.
B. A cell synthesizing membrane lipids in an internal membrane network without
ribosomes.
C. Chromosomal DNA being stored away from the cytosol.
D. A secreted protein entering the endoplasmic reticulum during translation.
Correct Answer: A. Breakdown of engulfed or damaged macromolecular material
in an acidic compartment.
Explanation: The most important distinction is that Breakdown of engulfed or damaged
macromolecular material in an acidic compartment. is a representative example of
lysosome. A lysosome is a membrane-bound eukaryotic organelle containing hydrolytic
enzymes for intracellular digestion and recycling. The other options were drawn from
related module concepts, but each illustrates a different biochemical feature. Matching the
defining feature to the example is the most reliable way to solve this type of problem.
Question 6.
A student encounters this situation: The carbon-carbon bond in ethene. Which term should
the student select?
A. covalent bond
B. ether group
C. inorganic chemistry
D. double covalent bond
Correct Answer: D. double covalent bond
Explanation: The defining feature is that the clue points to double covalent bond. A
double covalent bond contains two shared electron pairs and restricts rotation more than a
single bond. The example given - The carbon-carbon bond in ethene. - is a direct
application of that definition. The alternative terms describe different structures,
processes, or roles and therefore do not fit the clue as closely.
Question 7.
Which example is most consistent with phosphate group?
A. The -NH2 group present in an amino acid.
B. The -COOH group of acetic acid.
C. A phosphate attached to a nucleotide.
D. The -CHO group of ethanal.
Correct Answer: C. A phosphate attached to a nucleotide.
Explanation: The most important distinction is that A phosphate attached to a nucleotide.
is a representative example of phosphate group. A phosphate-containing group
contributes negative charge and is central to energy transfer and nucleic-acid structure.
The other options were drawn from related module concepts, but each illustrates a
, different biochemical feature. Matching the defining feature to the example is the most
reliable way to solve this type of problem.
Question 8.
A student is distinguishing lysosome from nucleus. Which statement correctly describes
lysosome?
A. Rough endoplasmic reticulum bears ribosomes and participates in synthesis and early
processing of secreted and membrane proteins.
B. A lysosome is a membrane-bound eukaryotic organelle containing hydrolytic enzymes
for intracellular digestion and recycling.
C. A mitochondrion is a eukaryotic organelle central to aerobic energy metabolism and ATP
production.
D. The nucleus is the membrane-bound compartment that houses most of the DNA in a
eukaryotic cell.
Correct Answer: B. A lysosome is a membrane-bound eukaryotic organelle
containing hydrolytic enzymes for intracellular digestion and recycling.
Explanation: The correct interpretation is that lysosome should be defined as follows: A
lysosome is a membrane-bound eukaryotic organelle containing hydrolytic enzymes for
intracellular digestion and recycling. This differs from nucleus, which is described by a
separate set of properties. The distinction matters because substituting one term for the
other can change the predicted structure, location, or biochemical outcome. The correct
option therefore preserves the specific meaning of lysosome.
Question 9.
Which choice gives the clearest biochemical description of carbonyl group?
A. A carbonyl group consists of a carbon double-bonded to oxygen and occurs in
aldehydes, ketones, and other compounds.
B. A ketone contains a carbonyl carbon bonded to two carbon-containing groups.
C. An amino group contains nitrogen and commonly behaves as a base by accepting a
proton.
D. An ether contains an oxygen single-bonded to two carbon groups.
Correct Answer: A. A carbonyl group consists of a carbon double-bonded to
oxygen and occurs in aldehydes, ketones, and other compounds.
Explanation: The underlying principle is that A carbonyl group consists of a carbon
double-bonded to oxygen and occurs in aldehydes, ketones, and other compounds. That
definition directly matches the term named in the stem. By contrast, amino group refers to
a different idea: An amino group contains nitrogen and commonly behaves as a base by
accepting a proton. Keeping these definitions separate helps prevent errors when the
same concepts appear in biochemical structures or pathways.
SET QUESTIONS WITH ANSWERS AND EXPLANATIONS
Question 1.
Which observation would best demonstrate tetrahedral carbon geometry?
A. The central carbon in methane displaying four equivalent single bonds.
B. Breakdown of engulfed or damaged macromolecular material in an acidic compartment.
C. C2H6O representing the atom counts in an ethanol molecule.
D. The -COOH group of acetic acid.
Correct Answer: A. The central carbon in methane displaying four equivalent
single bonds.
Explanation: The most important distinction is that The central carbon in methane
displaying four equivalent single bonds. is a representative example of tetrahedral carbon
geometry. A carbon with four electron domains and four single bonds is approximately
tetrahedral with bond angles near 109.5 degrees. The other options were drawn from
related module concepts, but each illustrates a different biochemical feature. Matching the
defining feature to the example is the most reliable way to solve this type of problem.
Question 2.
A student is distinguishing carbon dioxide geometry from alkyne. Which statement
correctly describes carbon dioxide geometry?
A. An ether contains an oxygen single-bonded to two carbon groups.
B. Carbon dioxide is linear around its central carbon because the two double bonds create
two electron domains.
C. A carbon with four electron domains and four single bonds is approximately tetrahedral
with bond angles near 109.5 degrees.
D. An alkyne is a hydrocarbon that contains at least one carbon-carbon triple bond.
Correct Answer: B. Carbon dioxide is linear around its central carbon because
the two double bonds create two electron domains.
Explanation: This choice is correct because carbon dioxide geometry should be defined
as follows: Carbon dioxide is linear around its central carbon because the two double
bonds create two electron domains. This differs from alkyne, which is described by a
separate set of properties. The distinction matters because substituting one term for the
other can change the predicted structure, location, or biochemical outcome. The correct
option therefore preserves the specific meaning of carbon dioxide geometry.
,Question 3.
Consider this clue: Oxidation of fuels and oxidative phosphorylation occurring within a
double-membrane organelle. Which concept is being illustrated?
A. smooth endoplasmic reticulum
B. rough endoplasmic reticulum
C. nucleus
D. mitochondrion
Correct Answer: D. mitochondrion
Explanation: The defining feature is that the clue points to mitochondrion. A
mitochondrion is a eukaryotic organelle central to aerobic energy metabolism and ATP
production. The example given - Oxidation of fuels and oxidative phosphorylation
occurring within a double-membrane organelle. - is a direct application of that definition.
The alternative terms describe different structures, processes, or roles and therefore do
not fit the clue as closely.
Question 4.
A student is distinguishing carboxyl group from carbonyl group. Which statement correctly
describes carboxyl group?
A. A hydroxyl group is an -OH functional group commonly found in alcohols and many
carbohydrates.
B. A carbonyl group consists of a carbon double-bonded to oxygen and occurs in
aldehydes, ketones, and other compounds.
C. A carboxyl group contains a carbonyl and hydroxyl on the same carbon and can donate
a proton.
D. An ester contains a carbonyl carbon bonded to an oxygen that is also bonded to another
carbon group.
Correct Answer: C. A carboxyl group contains a carbonyl and hydroxyl on the
same carbon and can donate a proton.
Explanation: The correct interpretation is that carboxyl group should be defined as
follows: A carboxyl group contains a carbonyl and hydroxyl on the same carbon and can
donate a proton. This differs from carbonyl group, which is described by a separate set of
properties. The distinction matters because substituting one term for the other can change
the predicted structure, location, or biochemical outcome. The correct option therefore
preserves the specific meaning of carboxyl group.
,Question 5.
Which option provides the strongest example of lysosome?
A. Breakdown of engulfed or damaged macromolecular material in an acidic compartment.
B. A cell synthesizing membrane lipids in an internal membrane network without
ribosomes.
C. Chromosomal DNA being stored away from the cytosol.
D. A secreted protein entering the endoplasmic reticulum during translation.
Correct Answer: A. Breakdown of engulfed or damaged macromolecular material
in an acidic compartment.
Explanation: The most important distinction is that Breakdown of engulfed or damaged
macromolecular material in an acidic compartment. is a representative example of
lysosome. A lysosome is a membrane-bound eukaryotic organelle containing hydrolytic
enzymes for intracellular digestion and recycling. The other options were drawn from
related module concepts, but each illustrates a different biochemical feature. Matching the
defining feature to the example is the most reliable way to solve this type of problem.
Question 6.
A student encounters this situation: The carbon-carbon bond in ethene. Which term should
the student select?
A. covalent bond
B. ether group
C. inorganic chemistry
D. double covalent bond
Correct Answer: D. double covalent bond
Explanation: The defining feature is that the clue points to double covalent bond. A
double covalent bond contains two shared electron pairs and restricts rotation more than a
single bond. The example given - The carbon-carbon bond in ethene. - is a direct
application of that definition. The alternative terms describe different structures,
processes, or roles and therefore do not fit the clue as closely.
Question 7.
Which example is most consistent with phosphate group?
A. The -NH2 group present in an amino acid.
B. The -COOH group of acetic acid.
C. A phosphate attached to a nucleotide.
D. The -CHO group of ethanal.
Correct Answer: C. A phosphate attached to a nucleotide.
Explanation: The most important distinction is that A phosphate attached to a nucleotide.
is a representative example of phosphate group. A phosphate-containing group
contributes negative charge and is central to energy transfer and nucleic-acid structure.
The other options were drawn from related module concepts, but each illustrates a
, different biochemical feature. Matching the defining feature to the example is the most
reliable way to solve this type of problem.
Question 8.
A student is distinguishing lysosome from nucleus. Which statement correctly describes
lysosome?
A. Rough endoplasmic reticulum bears ribosomes and participates in synthesis and early
processing of secreted and membrane proteins.
B. A lysosome is a membrane-bound eukaryotic organelle containing hydrolytic enzymes
for intracellular digestion and recycling.
C. A mitochondrion is a eukaryotic organelle central to aerobic energy metabolism and ATP
production.
D. The nucleus is the membrane-bound compartment that houses most of the DNA in a
eukaryotic cell.
Correct Answer: B. A lysosome is a membrane-bound eukaryotic organelle
containing hydrolytic enzymes for intracellular digestion and recycling.
Explanation: The correct interpretation is that lysosome should be defined as follows: A
lysosome is a membrane-bound eukaryotic organelle containing hydrolytic enzymes for
intracellular digestion and recycling. This differs from nucleus, which is described by a
separate set of properties. The distinction matters because substituting one term for the
other can change the predicted structure, location, or biochemical outcome. The correct
option therefore preserves the specific meaning of lysosome.
Question 9.
Which choice gives the clearest biochemical description of carbonyl group?
A. A carbonyl group consists of a carbon double-bonded to oxygen and occurs in
aldehydes, ketones, and other compounds.
B. A ketone contains a carbonyl carbon bonded to two carbon-containing groups.
C. An amino group contains nitrogen and commonly behaves as a base by accepting a
proton.
D. An ether contains an oxygen single-bonded to two carbon groups.
Correct Answer: A. A carbonyl group consists of a carbon double-bonded to
oxygen and occurs in aldehydes, ketones, and other compounds.
Explanation: The underlying principle is that A carbonyl group consists of a carbon
double-bonded to oxygen and occurs in aldehydes, ketones, and other compounds. That
definition directly matches the term named in the stem. By contrast, amino group refers to
a different idea: An amino group contains nitrogen and commonly behaves as a base by
accepting a proton. Keeping these definitions separate helps prevent errors when the
same concepts appear in biochemical structures or pathways.
