WGU C785 Biochemistry
Unit Exam
Which of the following is a monosaccharide?
A) Sucrose
B) Maltose
C) Glucose
D) Lactose
Answer: C) Glucose
Which bond links amino acids together in a protein?
A) Hydrogen bond
B) Peptide bond
C) Glycosidic bond
D) Phosphodiester bond
Answer: B) Peptide bond
The primary structure of a protein is determined by:
A) Hydrogen bonding between amino acids
B) The sequence of amino acids
C) Disulfide bridges
D) Hydrophobic interactions
Answer: B) The sequence of amino acids
What is the main function of ribosomes in a cell?
A) Lipid synthesis
,B) ATP production
C) Protein synthesis
D) DNA replication
Answer: C) Protein synthesis
Which molecule is considered the universal energy currency of the cell?
A) NADH
B) ATP
C) FADH2
D) GTP
Answer: B) ATP
Glycolysis occurs in which part of the cell?
A) Mitochondrial matrix
B) Cytoplasm
C) Nucleus
D) Endoplasmic reticulum
Answer: B) Cytoplasm
In the electron transport chain, which complex is responsible for pumping protons
into the intermembrane space first?
A) Complex I
B) Complex II
C) Complex III
D) Complex IV
Answer: A) Complex I
Which of the following amino acids is essential?
A) Alanine
B) Leucine
C) Glutamine
D) Glycine
, Answer: B) Leucine
A competitive inhibitor affects an enzyme by:
A) Binding to the active site
B) Changing enzyme shape
C) Denaturing the enzyme
D) Phosphorylating the substrate
Answer: A) Binding to the active site
Which of the following lipids is most abundant in cell membranes?
A) Cholesterol
B) Phospholipids
C) Triglycerides
D) Glycolipids
Answer: B) Phospholipids
Short Answer Questions
Explain the difference between saturated and unsaturated fatty acids.
Answer: Saturated fatty acids have no double bonds between carbon atoms, making
them solid at room temperature. Unsaturated fatty acids have one or more double
bonds, creating kinks that make them liquid at room temperature.
What is the role of NAD+ in cellular respiration?
Answer: NAD+ acts as an electron carrier, accepting electrons during glycolysis and
the Krebs cycle to become NADH, which then donates electrons to the electron
transport chain.
Describe the difference between DNA and RNA.
Answer: DNA contains deoxyribose sugar and thymine, is double-stranded, and
stores genetic information. RNA contains ribose sugar and uracil, is usually single-
stranded, and is involved in protein synthesis.
Unit Exam
Which of the following is a monosaccharide?
A) Sucrose
B) Maltose
C) Glucose
D) Lactose
Answer: C) Glucose
Which bond links amino acids together in a protein?
A) Hydrogen bond
B) Peptide bond
C) Glycosidic bond
D) Phosphodiester bond
Answer: B) Peptide bond
The primary structure of a protein is determined by:
A) Hydrogen bonding between amino acids
B) The sequence of amino acids
C) Disulfide bridges
D) Hydrophobic interactions
Answer: B) The sequence of amino acids
What is the main function of ribosomes in a cell?
A) Lipid synthesis
,B) ATP production
C) Protein synthesis
D) DNA replication
Answer: C) Protein synthesis
Which molecule is considered the universal energy currency of the cell?
A) NADH
B) ATP
C) FADH2
D) GTP
Answer: B) ATP
Glycolysis occurs in which part of the cell?
A) Mitochondrial matrix
B) Cytoplasm
C) Nucleus
D) Endoplasmic reticulum
Answer: B) Cytoplasm
In the electron transport chain, which complex is responsible for pumping protons
into the intermembrane space first?
A) Complex I
B) Complex II
C) Complex III
D) Complex IV
Answer: A) Complex I
Which of the following amino acids is essential?
A) Alanine
B) Leucine
C) Glutamine
D) Glycine
, Answer: B) Leucine
A competitive inhibitor affects an enzyme by:
A) Binding to the active site
B) Changing enzyme shape
C) Denaturing the enzyme
D) Phosphorylating the substrate
Answer: A) Binding to the active site
Which of the following lipids is most abundant in cell membranes?
A) Cholesterol
B) Phospholipids
C) Triglycerides
D) Glycolipids
Answer: B) Phospholipids
Short Answer Questions
Explain the difference between saturated and unsaturated fatty acids.
Answer: Saturated fatty acids have no double bonds between carbon atoms, making
them solid at room temperature. Unsaturated fatty acids have one or more double
bonds, creating kinks that make them liquid at room temperature.
What is the role of NAD+ in cellular respiration?
Answer: NAD+ acts as an electron carrier, accepting electrons during glycolysis and
the Krebs cycle to become NADH, which then donates electrons to the electron
transport chain.
Describe the difference between DNA and RNA.
Answer: DNA contains deoxyribose sugar and thymine, is double-stranded, and
stores genetic information. RNA contains ribose sugar and uracil, is usually single-
stranded, and is involved in protein synthesis.
