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Read the following statements carefully ...

Read the following statements carefully and choose the correct statements.
A. In a transcription unit, the promoter located at the 5' end of coding strand
B. The single strand DNA having the polarity `5' rarr 3'` is the template strand
C. RNA polymerase binds to the operator during transcription.
D. Single base DNA differences occur in humans are called Single Nucleotide Polymorphism (SNPs).

A

Statements B and D

B

Statements A and B

C

Statements A and D

D

Statements B and C

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to evaluate each statement one by one and determine whether it is correct or incorrect based on our understanding of molecular biology, specifically the processes of transcription and the concept of Single Nucleotide Polymorphism (SNP). ### Step-by-Step Solution: 1. **Evaluate Statement A:** - **Statement:** In a transcription unit, the promoter is located at the 5' end of the coding strand. - **Analysis:** The promoter is indeed located at the 5' end of the coding strand. This is where RNA polymerase binds to initiate transcription. Therefore, this statement is **correct**. 2. **Evaluate Statement B:** - **Statement:** The single strand DNA having the polarity 5' to 3' is the template strand. - **Analysis:** This statement is misleading. The template strand is actually the one that runs in the 3' to 5' direction relative to the RNA being synthesized, which runs in the 5' to 3' direction. Therefore, this statement is **incorrect**. 3. **Evaluate Statement C:** - **Statement:** RNA polymerase binds to the operator during transcription. - **Analysis:** RNA polymerase binds to the promoter region, not the operator. The operator is a regulatory sequence that can affect the binding of RNA polymerase but is not the site of binding itself. Therefore, this statement is **incorrect**. 4. **Evaluate Statement D:** - **Statement:** Single base DNA differences that occur in humans are called Single Nucleotide Polymorphism (SNPs). - **Analysis:** This statement is accurate. SNPs refer to variations at a single nucleotide position in the DNA sequence among individuals. Therefore, this statement is **correct**. ### Conclusion: Based on the evaluations, the correct statements are: - **A**: Correct - **B**: Incorrect - **C**: Incorrect - **D**: Correct Thus, the correct answers are **A and D**.
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