Molecular Biology Concepts Quiz
Test your knowledge with questions on central dogma, DNA replication, RNA types, gene expression, and more in molecular biology.
#1
Which of the following is not a type of mutation?
Substitution
Insertion
Translation
Deletion
#2
Which of the following is not a component of an amino acid?
Amino group
Carboxyl group
Phosphate group
R-group (side chain)
#3
What is the function of restriction enzymes in molecular biology?
To replicate DNA
To cut DNA at specific sequences
To transcribe RNA
To amplify DNA
#4
Which of the following is not a nitrogenous base found in DNA?
Adenine
Thymine
Cytosine
Uracil
#5
What is the central dogma of molecular biology?
DNA replication
RNA transcription
Protein translation
All of the above
#6
Which enzyme is responsible for unwinding DNA during replication?
DNA polymerase
RNA polymerase
Helicase
Ligase
#7
What is the role of tRNA in translation?
Carries amino acids to the ribosome
Adds nucleotides to the growing RNA strand
Unwinds the DNA double helix
Forms peptide bonds between amino acids
#8
What is the primary function of DNA polymerase during DNA replication?
Unwinds the DNA double helix
Adds nucleotides to the growing DNA strand
Catalyzes the formation of phosphodiester bonds
Transcribes RNA into DNA
#9
What is the role of RNA polymerase in gene expression?
Adds nucleotides to the growing RNA strand during transcription
Unwinds the DNA double helix
Transcribes DNA into RNA
Forms peptide bonds between amino acids
#10
What is the function of PCR (Polymerase Chain Reaction)?
To amplify DNA
To transcribe RNA
To translate proteins
To digest DNA
#11
What is the function of DNA ligase in DNA replication?
It unwinds the DNA double helix.
It adds nucleotides to the growing DNA strand.
It joins Okazaki fragments together.
It synthesizes RNA from DNA.
#12
What is the role of the Shine-Dalgarno sequence in bacterial translation?
It signals the start codon.
It helps in the binding of mRNA to the ribosome.
It codes for an amino acid.
It marks the end of translation.
#13
What is the significance of the genetic code being degenerate?
It allows for redundancy in the code.
It prevents errors during transcription.
It increases the speed of translation.
It enhances DNA replication.
#14
Which of the following is not a component of the lac operon in bacteria?
Promoter
Operator
Repressor
tRNA
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