A section of DNA from a human cell was sequenced and compared to a database of sequences of human genes - Scottish Highers Biology - Question 3 - 2023
Question 3
A section of DNA from a human cell was sequenced and compared to a database of sequences of human genes. The sequence did not match the sequence for any protein codi... show full transcript
Worked Solution & Example Answer:A section of DNA from a human cell was sequenced and compared to a database of sequences of human genes - Scottish Highers Biology - Question 3 - 2023
Step 1
A tRNA
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Answer
The section of DNA described is likely to be involved in the production of tRNA. tRNA (transfer RNA) is essential for protein synthesis since it carries amino acids to the ribosome and matches them to the coded mRNA sequence. Non-coding sequences, which do not correspond to proteins, can include tRNA genes.
Step 2
B proteins
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The section of DNA is not likely involved in the production of proteins, as it did not match any coding genes. Protein coding requires specific sequences of DNA that are transcribed into mRNA.
Step 3
C exons
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Exons are coding regions in a gene that are transcribed into mRNA. Since the sequence did not match any protein coding genes, it suggests the section is not likely to be an exon.
Step 4
D mRNA
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mRNA (messenger RNA) is transcribed from DNA and carries genetic information for protein synthesis. The lack of match with coding sequences indicates this DNA section is not directly responsible for mRNA but may aid in the production of non-coding RNAs such as tRNA.
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