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From which molecule is an mRNA molecule transcribed?
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15. Gene Expression
Introduction to Transcription
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Why is it problematic if there is an error during the transcription of DNA into mRNA?
A
The mRNA will not be able to exit the nucleus.
B
The resulting mRNA may code for a nonfunctional or harmful protein.
C
The DNA sequence will be permanently altered.
D
The error will be corrected during translation.
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Understand the process of transcription: Transcription is the first step in gene expression where a segment of DNA is copied into mRNA by the enzyme RNA polymerase.
Recognize the role of mRNA: mRNA serves as a template for protein synthesis during translation. It carries the genetic information from the DNA in the nucleus to the ribosomes in the cytoplasm.
Identify the impact of transcription errors: If there is an error during transcription, the mRNA sequence may be altered, leading to incorrect codons that can result in the synthesis of a nonfunctional or harmful protein.
Consider the consequences of altered proteins: Proteins are crucial for various cellular functions. A nonfunctional protein may disrupt normal cellular processes, while a harmful protein could lead to disease or cellular damage.
Clarify the misconception about error correction: Unlike DNA replication, transcription errors are not typically corrected during translation, meaning the error persists and affects protein synthesis.
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