PORTAGE LEARNING CHEM 210
BIOCHEMISTRY FINAL EXAM
QUESTIONS AND ANSWERS 2026
VERIFIED.
T/F: Hydrogen is called the superglue of the chemical world. - ANS false
carbon = superglue of the world
T/F: Small elements, such as nitrogen, are common in biomolecules. - ANS true
Small elements that are common in biomolecules: - ANS CHOPS N:
- carbon
- hydrogen
- oxygen
- phosphorous
- sulfur
- nitrogen
T/F: The time it takes for a compound to flow through a metabolic pathway is called the flux. -
ANS true
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 18
,T/F: Proteins, carbohydrates, and fats all get broken down into NADH and FADH2 in energy
production. - ANS true
T/F: A fat is a lipid molecules that is a liquid at room temperature. - ANS false
In RNA, guanine always pairs with: - ANS cytosine
In RNA, adenine always pairs with: - ANS uracil
In DNA, adenine always pairs with: - ANS thymine
Water is considered a polar solvent due to attractive forces known as hydrogen bonds. A
hydrogen bond is: - ANS an attractive force between molecules where partially positive
hydrogen atoms are attracted to partially negative atoms of F, O, or N
What is a London force? - ANS a temporary attraction between atoms due to electron
alignment
What is a dipole-dipole force? - ANS an attraction between the positive end of one polar
molecule and the negative end of another
What attributes contribute to water's unusual properties? - ANS 1. geometry of the molecule
2. polarity of the -OH bonds
3. ability of water molecules to hydrogen bond
4. body angle of water molecules to H bond
The H+ concentration of a solution is 7.9 x 10^-13 M. What is the pH? - ANS 12.1
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 18
, pH = -log(7.9 x 10^-13)
What represents the free-energy change of a reaction? - ANS ΔG = Gibbs free energy
What is the measure of heat content in a reaction? - ANS ΔH = enthalpy
What is the measure of order of the system in a reaction? - ANS ΔS = entropy
A fibrous protein is an example of a protein ___. - ANS conformation
What is an example of protein conformation? - ANS fibrous and globular
Any molecule or ion that is necessary for an enzyme's function is called: - ANS cofactor
In a particular cell, molecules X binds to an enzyme causing to stop catalyzing reactions.
Molecule X is called what? - ANS inhibitor
What is the function of lipids in cells? - ANS 1. energy source/storage
2. structural role in membranes (myelin sheaths)
3. vitamins
4. basis for dye molecules (carotenoids)
What is the function of carbohydrates in cells? - ANS 1. structural role in DNA and RNA
2. intermediate in metabolism
3. energy source for cells
@COPYRIGHT ALL RIGHTS RESERVED PAGE 3 OF 18
BIOCHEMISTRY FINAL EXAM
QUESTIONS AND ANSWERS 2026
VERIFIED.
T/F: Hydrogen is called the superglue of the chemical world. - ANS false
carbon = superglue of the world
T/F: Small elements, such as nitrogen, are common in biomolecules. - ANS true
Small elements that are common in biomolecules: - ANS CHOPS N:
- carbon
- hydrogen
- oxygen
- phosphorous
- sulfur
- nitrogen
T/F: The time it takes for a compound to flow through a metabolic pathway is called the flux. -
ANS true
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 18
,T/F: Proteins, carbohydrates, and fats all get broken down into NADH and FADH2 in energy
production. - ANS true
T/F: A fat is a lipid molecules that is a liquid at room temperature. - ANS false
In RNA, guanine always pairs with: - ANS cytosine
In RNA, adenine always pairs with: - ANS uracil
In DNA, adenine always pairs with: - ANS thymine
Water is considered a polar solvent due to attractive forces known as hydrogen bonds. A
hydrogen bond is: - ANS an attractive force between molecules where partially positive
hydrogen atoms are attracted to partially negative atoms of F, O, or N
What is a London force? - ANS a temporary attraction between atoms due to electron
alignment
What is a dipole-dipole force? - ANS an attraction between the positive end of one polar
molecule and the negative end of another
What attributes contribute to water's unusual properties? - ANS 1. geometry of the molecule
2. polarity of the -OH bonds
3. ability of water molecules to hydrogen bond
4. body angle of water molecules to H bond
The H+ concentration of a solution is 7.9 x 10^-13 M. What is the pH? - ANS 12.1
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 18
, pH = -log(7.9 x 10^-13)
What represents the free-energy change of a reaction? - ANS ΔG = Gibbs free energy
What is the measure of heat content in a reaction? - ANS ΔH = enthalpy
What is the measure of order of the system in a reaction? - ANS ΔS = entropy
A fibrous protein is an example of a protein ___. - ANS conformation
What is an example of protein conformation? - ANS fibrous and globular
Any molecule or ion that is necessary for an enzyme's function is called: - ANS cofactor
In a particular cell, molecules X binds to an enzyme causing to stop catalyzing reactions.
Molecule X is called what? - ANS inhibitor
What is the function of lipids in cells? - ANS 1. energy source/storage
2. structural role in membranes (myelin sheaths)
3. vitamins
4. basis for dye molecules (carotenoids)
What is the function of carbohydrates in cells? - ANS 1. structural role in DNA and RNA
2. intermediate in metabolism
3. energy source for cells
@COPYRIGHT ALL RIGHTS RESERVED PAGE 3 OF 18
