Biology and Cell Biology
Practice Test
Questions And
Answers 2026
1. What are the two common types of secondary protein structures?
peptide bonds and hydrogen bonds
primary and tertiary structure
quaternary structure and disulfide bonds
a-helix and ß-pleated sheet
2. What are the four primary elements that make up 96% of living matter in
organisms?
H2O (Water)
HONC (Hydrogen, Oxygen, Nitrogen, Carbon)
NaCl (Sodium Chloride)
C6H12O6 (Glucose)
3. Describe the role of the middle lamella in the context of plant cell structure.
The middle lamella acts as a glue that binds adjacent plant cells
together, providing structural integrity.
The middle lamella is involved in the synthesis of chlorophyll.
The middle lamella is responsible for cellular respiration.
The middle lamella regulates the flow of nutrients between cells.
4. Describe the role of tRNA in the translation process.
tRNA transports specific amino acids to the ribosome during
,translation.
, tRNA binds to ribosomes to initiate transcription.
tRNA synthesizes mRNA from DNA.
tRNA acts as a catalyst for DNA replication.
5. What type of molecules are starch and cellulose classified as?
Glucose polymers
Nucleic acids
Proteins
Lipids
6. Which two bases in DNA form complementary pairs through hydrogen
bonding?
Cytosine and Uracil
Guanine and Cytosine
Adenine and Thymine
Adenine and Guanine
7. What is quorum sensing primarily associated with in terms of cellular
communication?
Eukaryotes
Prokaryotes
Fungi
Viruses
8. Describe the significance of the R-group in the structure of an amino acid.
, The R-group determines the specific properties and identity of each
amino acid.
The R-group has no significant role in protein structure.
The R-group is responsible for the amino acid's charge only.
The R-group is a universal component found in all amino acids.
9. What is the role of single-strand DNA binding proteins during DNA
replication?
To hold the DNA strands apart
To repair DNA mutations
To synthesize new DNA strands
To act as an electron acceptor
10. What is the primary condition under which glycolysis occurs?
It is inhibited by the presence of oxygen.
It occurs whether oxygen is present or absent.
It requires oxygen to proceed.
It only occurs in aerobic conditions.
11. Describe why gaps at the 5' end of the lagging strand affect telomere
replication in eukaryotic cells.
Gaps at the 5' end do not affect telomere replication.
Gaps at the 5' end of the lagging strand lead to incomplete
replication of telomeres, necessitating specialized mechanisms for
their maintenance.
Gaps at the 5' end are repaired by DNA ligase.
Practice Test
Questions And
Answers 2026
1. What are the two common types of secondary protein structures?
peptide bonds and hydrogen bonds
primary and tertiary structure
quaternary structure and disulfide bonds
a-helix and ß-pleated sheet
2. What are the four primary elements that make up 96% of living matter in
organisms?
H2O (Water)
HONC (Hydrogen, Oxygen, Nitrogen, Carbon)
NaCl (Sodium Chloride)
C6H12O6 (Glucose)
3. Describe the role of the middle lamella in the context of plant cell structure.
The middle lamella acts as a glue that binds adjacent plant cells
together, providing structural integrity.
The middle lamella is involved in the synthesis of chlorophyll.
The middle lamella is responsible for cellular respiration.
The middle lamella regulates the flow of nutrients between cells.
4. Describe the role of tRNA in the translation process.
tRNA transports specific amino acids to the ribosome during
,translation.
, tRNA binds to ribosomes to initiate transcription.
tRNA synthesizes mRNA from DNA.
tRNA acts as a catalyst for DNA replication.
5. What type of molecules are starch and cellulose classified as?
Glucose polymers
Nucleic acids
Proteins
Lipids
6. Which two bases in DNA form complementary pairs through hydrogen
bonding?
Cytosine and Uracil
Guanine and Cytosine
Adenine and Thymine
Adenine and Guanine
7. What is quorum sensing primarily associated with in terms of cellular
communication?
Eukaryotes
Prokaryotes
Fungi
Viruses
8. Describe the significance of the R-group in the structure of an amino acid.
, The R-group determines the specific properties and identity of each
amino acid.
The R-group has no significant role in protein structure.
The R-group is responsible for the amino acid's charge only.
The R-group is a universal component found in all amino acids.
9. What is the role of single-strand DNA binding proteins during DNA
replication?
To hold the DNA strands apart
To repair DNA mutations
To synthesize new DNA strands
To act as an electron acceptor
10. What is the primary condition under which glycolysis occurs?
It is inhibited by the presence of oxygen.
It occurs whether oxygen is present or absent.
It requires oxygen to proceed.
It only occurs in aerobic conditions.
11. Describe why gaps at the 5' end of the lagging strand affect telomere
replication in eukaryotic cells.
Gaps at the 5' end do not affect telomere replication.
Gaps at the 5' end of the lagging strand lead to incomplete
replication of telomeres, necessitating specialized mechanisms for
their maintenance.
Gaps at the 5' end are repaired by DNA ligase.
