QQuestionBiology
QuestionBiology
"Which of the following events occurs during transcription?
A. Those segments of the RNA strand that do not actually code for the protein are removed.
B. A molecule of RNA is formed based on the sequence of nucleotides in DNA.
C. The message in mRNA is translated into a protein.
D. A cap is added to the RNA molecule."
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Answer
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Step 1:Let's solve this step by step:
Step 2:: Understanding Transcription
Transcription is the first step in gene expression, where genetic information is transferred from DNA to RNA. During this process, the genetic code from DNA is copied into a complementary RNA molecule.
Step 3:: Analyzing the Options
Let's carefully examine each option: A. Removing non-coding segments: This actually occurs during RNA splicing (post-transcription), not during transcription itself. B. Forming an RNA molecule based on DNA sequence: This EXACTLY describes transcription. During transcription, RNA polymerase creates an RNA strand using the DNA template strand as a guide. C. Translating mRNA into a protein: This occurs during translation, which happens AFTER transcription, when ribosomes read the mRNA and create a protein. D. Adding a cap to the RNA molecule: While a cap is added to mRNA, this occurs during RNA processing after transcription, not during the actual transcription process.
Step 4:: Identifying the Correct Answer
The correct answer is B. During transcription, an RNA molecule is formed based on the sequence of nucleotides in DNA.
Final Answer
A molecule of RNA is formed based on the sequence of nucleotides in DNA. Key Concept: Transcription is the process of creating an RNA copy of a gene sequence directly from the DNA template, which is the first step in gene expression.
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