CHEM 210 Biochemistry Module 1 Exam (2024/2025) – Portage Learning Questions and Verified Answers | 100% Guarantee Pass

CHEM 210 Biochemistry Module 1 Exam
(2024/2025) – Portage Learning Questions and
Verified Answers | 100% Guarantee Pass

Multiple-Choice Questions (1–35)
Question 1: What is the primary source of energy for Earth’s climate system?
A) Fossil fuels
B) The Sun
C) Geothermal energy
D) Biomass
Answer: B) The Sun
Rationale: The Sun provides solar energy, driving Earth’s climate and supporting biochemical
processes like photosynthesis.

Question 2: Which element is the backbone of organic molecules?
A) Nitrogen
B) Carbon
C) Oxygen
D) Hydrogen
Answer: B) Carbon
Rationale: Carbon’s ability to form four covalent bonds makes it the backbone of organic
molecules.

Question 3: Which functional group is characterized by a hydroxyl group (-OH)?
A) Carboxyl
B) Amino
C) Hydroxyl
D) Carbonyl
Answer: C) Hydroxyl
Rationale: The hydroxyl group (-OH) is found in alcohols and contributes to polarity in
molecules.

Question 4: Which biomolecule class serves as the primary energy source in cells?
A) Proteins
B) Carbohydrates
C) Lipids
D) Nucleic acids
Answer: B) Carbohydrates
Rationale: Carbohydrates, like glucose, are the primary energy source via glycolysis.

, Question 5: What type of bond involves the sharing of electrons?
A) Ionic bond
B) Hydrogen bond
C) Covalent bond
D) Van der Waals forces
Answer: C) Covalent bond
Rationale: Covalent bonds involve electron sharing, forming strong connections in organic
molecules.

Question 6: Which functional group contains a nitrogen atom bonded to two hydrogens?
A) Hydroxyl
B) Amino
C) Carboxyl
D) Sulfhydryl
Answer: B) Amino
Rationale: The amino group (-NH₂) is found in amines and amino acids, contributing to basicity.

Question 7: Which biomolecule class stores genetic information?
A) Carbohydrates
B) Lipids
C) Proteins
D) Nucleic acids
Answer: D) Nucleic acids
Rationale: Nucleic acids (DNA and RNA) store and transmit genetic information.

Question 8: What is the primary component of cell membranes?
A) Proteins
B) Carbohydrates
C) Lipids
D) Nucleic acids
Answer: C) Lipids
Rationale: Phospholipids form the bilayer structure of cell membranes.

Question 9: Which functional group is found in ketones?
A) Hydroxyl
B) Carbonyl
C) Carboxyl
D) Phosphate
Answer: B) Carbonyl
Rationale: The carbonyl group (C=O) is found in ketones (within the carbon chain) and
aldehydes (at the end).

Question 10: Which type of molecule is hydrophobic?
A) Polar molecules
B) Nonpolar molecules
C) Ionic compounds