1|Page
CBSE BIOCHEM Exam||Verified Exam!!!|| Actual Test
Questions and Correct Answers With Rationales
LATEST THIS YEAR.pdf||NEWEST EXAM!!!
Which of the following is considered a noncovalent bond?
A) Electrostatic interactions
B) Hydrogen bonds
C) Van der Waals interactions
D) All of the above
E) None of the above - Answer-D) All of the above
The First Law of Thermodynamics states what? - Answer-
The total energy of a system and its surroundings is
constant
The Second Law of Thermodynamics states what? -
Answer-The total entropy of a system and its surroundings
always increases for a spontaneous process
List atoms commonly found in biological molecules that
are often hydrogen-bond acceptors. - Answer-Oxygen
Nitrogen
,2|Page
What is the [A-]/[HA] ratio when the weak acid is in a
solution one pH unit below its pKa? - Answer-1:10
If a particular reaction has a negative delta-G (Gibbs Free
Energy), is it likely to occur? - Answer-Yes, it is
spontaneous
What is the [H+] concentration in a urine sample that has a
pH of 8? - Answer-10^-8 M
What happens to nonpolar molecules in water? - Answer-
They aggregate together
What type of chiral amino acids is found in proteins? -
Answer-L
What is another name for dipolar molecules? - Answer-
Zwitterions
When a peptide bond is formed, what molecule is also
made? - Answer-Water
,3|Page
Write the name, three letter code, and single letter code
for the amino acid for the following:
A) the amino acid with a pKa near neutral pH
B) disulfide bonds are formed by pairs of which amino acid
C) this amino acid residue disrupts the alpha-helix
because its side chain contains a unique ring structure
that restricts bond rotation - Answer-A) Histidine, His, H
B) Cysteine, Cys, C
C) Proline, Pro, P
What determines a protein's function? - Answer-Structure
What is the name of the plot that allows one to investigate
the likely orientation of certain amino acid pairs? - Answer-
Ramachandran
What type of structure includes alpha-helices, beta-sheets,
and turns? - Answer-Secondary structure
, 4|Page
What type of protein structure develops when two proteins
combine to form one larger protein? - Answer-Quaternary
structure
What is responsible for the tertiary structure of proteins? -
Answer-Interactions between amino acid side chains
Which of these agents can denature proteins?
A) Salt
B) Alcohol
C) UV light
D) All of the above - Answer-D) All of the above
Combining three amino acids produces what? - Answer-A
tripeptide + 2 water molecules
Disulfide bonds in proteins can be reduced to free
sulfhydryl groups by reagents such as _______. - Answer-
Beta-mercaptoethanol
CBSE BIOCHEM Exam||Verified Exam!!!|| Actual Test
Questions and Correct Answers With Rationales
LATEST THIS YEAR.pdf||NEWEST EXAM!!!
Which of the following is considered a noncovalent bond?
A) Electrostatic interactions
B) Hydrogen bonds
C) Van der Waals interactions
D) All of the above
E) None of the above - Answer-D) All of the above
The First Law of Thermodynamics states what? - Answer-
The total energy of a system and its surroundings is
constant
The Second Law of Thermodynamics states what? -
Answer-The total entropy of a system and its surroundings
always increases for a spontaneous process
List atoms commonly found in biological molecules that
are often hydrogen-bond acceptors. - Answer-Oxygen
Nitrogen
,2|Page
What is the [A-]/[HA] ratio when the weak acid is in a
solution one pH unit below its pKa? - Answer-1:10
If a particular reaction has a negative delta-G (Gibbs Free
Energy), is it likely to occur? - Answer-Yes, it is
spontaneous
What is the [H+] concentration in a urine sample that has a
pH of 8? - Answer-10^-8 M
What happens to nonpolar molecules in water? - Answer-
They aggregate together
What type of chiral amino acids is found in proteins? -
Answer-L
What is another name for dipolar molecules? - Answer-
Zwitterions
When a peptide bond is formed, what molecule is also
made? - Answer-Water
,3|Page
Write the name, three letter code, and single letter code
for the amino acid for the following:
A) the amino acid with a pKa near neutral pH
B) disulfide bonds are formed by pairs of which amino acid
C) this amino acid residue disrupts the alpha-helix
because its side chain contains a unique ring structure
that restricts bond rotation - Answer-A) Histidine, His, H
B) Cysteine, Cys, C
C) Proline, Pro, P
What determines a protein's function? - Answer-Structure
What is the name of the plot that allows one to investigate
the likely orientation of certain amino acid pairs? - Answer-
Ramachandran
What type of structure includes alpha-helices, beta-sheets,
and turns? - Answer-Secondary structure
, 4|Page
What type of protein structure develops when two proteins
combine to form one larger protein? - Answer-Quaternary
structure
What is responsible for the tertiary structure of proteins? -
Answer-Interactions between amino acid side chains
Which of these agents can denature proteins?
A) Salt
B) Alcohol
C) UV light
D) All of the above - Answer-D) All of the above
Combining three amino acids produces what? - Answer-A
tripeptide + 2 water molecules
Disulfide bonds in proteins can be reduced to free
sulfhydryl groups by reagents such as _______. - Answer-
Beta-mercaptoethanol
