Question

question 27
the part of the gene where the dna polymerase first binds during transcription is called the:
○ promoter
○ repressor
○ operon
question 28
experiments with bacteriophage by chase and hershey demonstrated that dna replication is which of
the following?
○ semi - conservative
○ moderate - to - liberal
○ ultra - conservative

Explanation:

Question 27

To solve this, we analyze each option:

• Promoter: A region of DNA where RNA polymerase (not DNA polymerase, but in transcription, RNA polymerase binds; however, the question might have a slight mix, but promoter is the binding site for the enzyme starting transcription). Wait, correction: In transcription, RNA polymerase binds to the promoter. But if we consider the question's wording (maybe a typo, but promoter is the correct binding site for the enzyme initiating transcription). Repressor is a protein that inhibits gene expression, operon is a unit of genes. So the correct answer is promoter.

Hershey - Chase experiment (with bacteriophage) showed that DNA is the genetic material. The semi - conservative nature of DNA replication was shown by Meselson - Stahl, but wait, no—wait, the Hershey - Chase experiment was about DNA as genetic material. Wait, maybe a mix - up. But the options: semi - conservative is the correct mode of DNA replication (Meselson - Stahl), but if the question is misphrased, and among the options, semi - conservative is the correct term for DNA replication. Moderate - to - liberal and ultra - conservative are not terms for DNA replication. So the answer is semi - conservative.

Answer:

A. promoter

Question 28