Living organisms make and use three main types of ribonucleic acids (RNA) for their biological functions ribosomal RNA (rRNA), messenger RNA (mRNA), and transfer RNA (tRNA).
Part A: Sort each description by the type of RNA it describes. Drag each item to the appropriate bin.
has introns and exons
is found in ribosomes
contains genes for a protein
contains an anticodon
has amino acids covalently attached in active form
is the most abundant form of RNA
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Part B: Indicate at which step of the replication-transcription-translation process each type of RNA first participates. Place them in the bin where they are first created or first participate.
Replication
Transcription
Translation
The Correct Answer and Explanation is:
✅ Correct Answers:
Part A: Sort descriptions by RNA type
mRNA (Messenger RNA)
- has introns and exons
- contains genes for a protein
rRNA (Ribosomal RNA)
- is found in ribosomes
- is the most abundant form of RNA
tRNA (Transfer RNA)
- contains an anticodon
- has amino acids covalently attached in active form
Part B: Indicate the step at which each RNA first participates
Replication:
- None of the RNA types are directly involved in DNA replication.
Transcription:
- mRNA
- rRNA
- tRNA
(All RNA types are synthesized during transcription.)
Translation:
- mRNA
- rRNA
- tRNA
(All three types of RNA function during translation.)
🧠 300-Word Explanation:
Living organisms rely on three main types of RNA—mRNA, rRNA, and tRNA—to carry out protein synthesis. Each plays a unique role and has specific features.
Messenger RNA (mRNA) is created during transcription and carries the genetic instructions from DNA to the ribosome. The mRNA molecule includes introns and exons (non-coding and coding sequences, respectively) in eukaryotes. After RNA splicing removes introns, mRNA contains the genes for a protein, serving as a template during translation.
Ribosomal RNA (rRNA) is a structural and functional component of ribosomes, the cell’s protein factories. It is found in ribosomes and acts as a catalyst for peptide bond formation between amino acids. rRNA is the most abundant RNA type in cells because ribosomes are heavily used for protein production. rRNA is also transcribed from DNA, making its first appearance during the transcription stage.
Transfer RNA (tRNA) is small but essential. It has an anticodon region that base-pairs with mRNA codons, and it becomes activated when amino acids are covalently attached to it. This activation occurs before translation. During translation, tRNA brings the correct amino acid to the ribosome based on the mRNA code.
In Part B, although replication involves DNA duplication, no RNA types are directly involved. In contrast, all RNA types are first synthesized during transcription and become functionally active during translation. mRNA provides the code, tRNA delivers amino acids, and rRNA facilitates the construction of the protein.
Understanding the roles and steps of each RNA helps clarify how genetic information flows from DNA to protein in a cell—a concept central to molecular biology.