1. To initiate transcription, RNA polymerase must recognize the ________ sequenc

Question

1. To initiate transcription, RNA polymerase must recognize the ________ sequence on DNA.

2. Ribosomal 30S subunit binds to mRNA by recognizing _________ sequence upstream of the start codon. (Full name for full credit)

3. A special initiator tRNA called ______ binds to the ______ site of the 70S ribosome for base pairing with the ATG start codon.

4. If RNA polymerase transcribes a long mRNA encoding more than one polypeptide, it is called a (an) _______ RNA.

5. Some genes are expressed constantly at a fixed rate. These gene are ______ genes.

Explanation / Answer

1. Promoter is the region where RNA polymerase binds and initiates transcription process.

2. Shine dalgarno sequence is complementary to 16S rRNA of 30 S subunit.

3. met-tRNA binds to the P site of the 70S ribosome. It is called special initiator tRNA as it initiates the translation process.and other met-tRNA are involved in elongation process.

5. Constitutive genes. They do not depend on the presence or absence of any factors to control its gene expression.

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