#1
What is the basic building block of nucleic acids?
Amino acids
Nucleotides
Carbohydrates
Fatty acids
#2
Which of the following nitrogenous bases is not found in RNA?
Adenine
Cytosine
Thymine
Uracil
#3
Which of the following is NOT a component of a nucleotide?
Phosphate group
Nitrogenous base
Ribose sugar
Deoxyribose sugar
#4
What type of bond holds the two strands of DNA together?
Ionic bond
Covalent bond
Hydrogen bond
Peptide bond
#5
During DNA replication, what enzyme is responsible for unwinding the DNA double helix?
DNA polymerase
Helicase
Ligase
RNA polymerase
#6
Which enzyme is responsible for joining Okazaki fragments during DNA replication?
DNA polymerase I
DNA polymerase III
DNA ligase
RNA primase
#7
In DNA replication, which direction does DNA polymerase synthesize the new strand?
5' to 3'
3' to 5'
5' to 5'
3' to 3'
#8
What is the role of the origin of replication in DNA replication?
To mark the end of the replication process
To initiate the unwinding of DNA strands
To terminate replication
To proofread the newly synthesized DNA strand
#9
What is the function of primase in DNA replication?
To add nucleotides to the growing DNA strand
To proofread the newly synthesized DNA strand
To synthesize RNA primers
To connect Okazaki fragments
#10
What is the function of topoisomerase during DNA replication?
To unwind the DNA double helix
To stabilize the unwound DNA strands
To join Okazaki fragments
To relieve supercoiling ahead of the replication fork
#11
Which DNA repair mechanism corrects errors that occur during DNA replication?
Base excision repair
Nucleotide excision repair
Mismatch repair
Homologous recombination
#12
What is the function of telomerase in DNA replication?
To unwind the DNA double helix
To proofread the newly synthesized DNA strand
To add telomeric DNA sequences to the ends of chromosomes
To repair DNA damage
#13
In DNA replication, what is the purpose of the sliding clamp protein?
To unwind the DNA double helix
To stabilize the unwound DNA strands
To join Okazaki fragments
To hold DNA polymerase in place during synthesis