Portage Learning CHEM 210 Biochemistry
Final Exam || 2026 (Actual Exam)
Questions with verified Answers |
FREQUENTLY MOST TESTED QUESTIONS
AND VERIFIED SOLUTIONS
1. True/False
Nitrogen is called the superglue of the chemical world.
Correct Answer: False
Rationale:
Nitrogen is an essential element in biological molecules,
particularly amino acids, proteins, nucleic acids, and other
nitrogen-containing compounds. However, nitrogen is not
commonly described as the “superglue of the chemical world.”
The statement is therefore false.
, 2. True/False
Large elements, such as strontium, are common in biomolecules.
Correct Answer: False
Rationale:
Biomolecules are primarily composed of relatively small,
biologically important elements such as carbon, hydrogen,
oxygen, nitrogen, phosphorus, and sulfur. Elements such as
strontium are not common structural components of the major
biomolecules found in living organisms.
3. True/False
The time it takes for a compound to flow through a metabolic
pathway is called the payoff phase.
Correct Answer: False
Rationale:
The payoff phase is a specific stage of glycolysis in which
energy-rich intermediates are converted into products while
ATP and NADH are generated. The movement of a compound
,through a metabolic pathway is more appropriately described in
terms of metabolic flux, which refers to the rate at which
material passes through a metabolic pathway.
4. True/False
Proteins, carbohydrates, and fats all get broken down into
acetyl-CoA.
Correct Answer: True
Rationale:
Carbohydrates can produce pyruvate through glycolysis, which
is then converted to acetyl-CoA. Fatty acids produce acetyl-CoA
through beta-oxidation. Certain amino acids derived from
proteins can also be converted into acetyl-CoA or intermediates
that enter related metabolic pathways. Acetyl-CoA is therefore a
major metabolic convergence point for energy metabolism.
5. True/False
A fat is a lipid molecule that is a solid at room temperature.
, Correct Answer: True
Rationale:
Fats are lipids that are generally solid at room temperature. They
commonly contain a relatively high proportion of saturated fatty
acids, which allow the molecules to pack closely together. In
contrast, oils are generally liquid at room temperature and
typically contain greater proportions of unsaturated fatty acids.
6. In DNA, guanine always pairs with ______.
A. Thymine
B. Guanine
C. Uracil
D. Cytosine
E. Both A and B
Correct Answer: D. Cytosine
Rationale:
In DNA, guanine (G) forms a complementary base pair with
cytosine (C). These bases are held together by three hydrogen
bonds, providing stability to the DNA double helix. Adenine
Final Exam || 2026 (Actual Exam)
Questions with verified Answers |
FREQUENTLY MOST TESTED QUESTIONS
AND VERIFIED SOLUTIONS
1. True/False
Nitrogen is called the superglue of the chemical world.
Correct Answer: False
Rationale:
Nitrogen is an essential element in biological molecules,
particularly amino acids, proteins, nucleic acids, and other
nitrogen-containing compounds. However, nitrogen is not
commonly described as the “superglue of the chemical world.”
The statement is therefore false.
, 2. True/False
Large elements, such as strontium, are common in biomolecules.
Correct Answer: False
Rationale:
Biomolecules are primarily composed of relatively small,
biologically important elements such as carbon, hydrogen,
oxygen, nitrogen, phosphorus, and sulfur. Elements such as
strontium are not common structural components of the major
biomolecules found in living organisms.
3. True/False
The time it takes for a compound to flow through a metabolic
pathway is called the payoff phase.
Correct Answer: False
Rationale:
The payoff phase is a specific stage of glycolysis in which
energy-rich intermediates are converted into products while
ATP and NADH are generated. The movement of a compound
,through a metabolic pathway is more appropriately described in
terms of metabolic flux, which refers to the rate at which
material passes through a metabolic pathway.
4. True/False
Proteins, carbohydrates, and fats all get broken down into
acetyl-CoA.
Correct Answer: True
Rationale:
Carbohydrates can produce pyruvate through glycolysis, which
is then converted to acetyl-CoA. Fatty acids produce acetyl-CoA
through beta-oxidation. Certain amino acids derived from
proteins can also be converted into acetyl-CoA or intermediates
that enter related metabolic pathways. Acetyl-CoA is therefore a
major metabolic convergence point for energy metabolism.
5. True/False
A fat is a lipid molecule that is a solid at room temperature.
, Correct Answer: True
Rationale:
Fats are lipids that are generally solid at room temperature. They
commonly contain a relatively high proportion of saturated fatty
acids, which allow the molecules to pack closely together. In
contrast, oils are generally liquid at room temperature and
typically contain greater proportions of unsaturated fatty acids.
6. In DNA, guanine always pairs with ______.
A. Thymine
B. Guanine
C. Uracil
D. Cytosine
E. Both A and B
Correct Answer: D. Cytosine
Rationale:
In DNA, guanine (G) forms a complementary base pair with
cytosine (C). These bases are held together by three hydrogen
bonds, providing stability to the DNA double helix. Adenine
