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WorksheetsDNA and RNA Quiz
Total questions: 20
Worksheet time: 3mins
What is the basic unit of DNA called?
Nucleotide
Ribosome
Amino acid
Glucose
Which nitrogenous base is found in RNA but not in DNA?
Adenine
Guanine
Uracil
Thymine
What is the main function of the nucleus in a cell?
Generating energy for the cell
Synthesizing proteins
Storing genetic material and controlling cell activities
Transporting molecules
What type of sugar is present in RNA?
Deoxyribose
Ribose
Glucose
Sucrose
During transcription, DNA is copied into which molecule?
tRNA
mRNA
rRNA
Protein
Which of the following is NOT part of a nucleotide?
Phosphate group
Nitrogenous base
Ribosome
Sugar
Which of the following is a correct pairing of nitrogenous bases in DNA?
Adenine - Uracil
Cytosine - Thymine
Guanine - Cytosine
Adenine - Guanine
What happens during translation in protein synthesis?
DNA is copied into RNA.
RNA is copied into DNA.
mRNA is used to assemble amino acids into a protein.
Amino acids are broken down into smaller molecules.
What is the role of tRNA during protein synthesis?
To carry genetic information from DNA to the ribosome.
To deliver amino acids to the ribosome for protein assembly.
To form ribosomes.
To replicate DNA.
What structure within the nucleus contains the cell’s genetic material?
Ribosome
Chromosomes
Nucleolus
Cytoplasm
How many strands does an RNA molecule typically have?
One
Two
Three
Four
Which organelle is responsible for protein synthesis?
Nucleus
Ribosome
Mitochondria
Golgi apparatus
What is the sequence of events in protein synthesis?
Transcription → Translation
Translation → Transcription
Replication → Transcription → Translation
Transcription → Replication
Which of the following best describes the shape of a DNA molecule?
Straight chain
Double helix
Circular
Linear single strand
What does the term "genetic code" refer to?
The sequence of amino acids in a protein.
The sequence of nitrogenous bases in DNA or RNA.
The arrangement of chromosomes in the nucleus.
The process of protein folding.
Which of the following is found in both DNA and RNA?
Thymine
Ribose
Adenine
Uracil
What is the purpose of the stop codon in mRNA?
To start protein synthesis.
To end protein synthesis.
To bring the tRNA to the ribosome.
To replicate DNA.
Where does transcription occur in a eukaryotic cell?
Cytoplasm
Ribosome
Nucleus
Golgi apparatus
19. What is a codon?
a) A sequence of three nucleotides in mRNA that codes for an amino acid.
b) A protein that helps in transcription.
c) A segment of DNA that replicates.
d) A structure that carries amino acids to the ribosome.
20. How many possible codons exist in the genetic code?
a) 20
b) 44
c) 64
d) 128
