Complete the following questions.
1. How does the lac operon switch off?
A) A repressor protein binds to the operator.
B) RNA polymerase binds to the operator.
C) Lactose binds to the promoter.
D) A repressor protein combines with lactose.
2. What term describes a DNA sequence that allows a gene to be transcribed?
A) exon
B) promoter
C) operon
D) intron
3. Which is not a part of an operon?
A) promoter
B) operator
C) intron
D) structural gene
4. What is the function of transcription factors in eukaryotic cells?
A) They control the expression of certain genes.
B) They bend the DNA to bring it close to the operator.
C) They produce the TATA box.
D) They help RNA polymerase know where a gene starts.
5. What does not happen during mRNA processing?
A) Introns are cut out.
B) A cap and tail are added.
C) Exons are removed.
D) Exons are spliced together.
1. How does the lac operon switch off?
A) A repressor protein binds to the operator.
B) RNA polymerase binds to the operator.
C) Lactose binds to the promoter.
D) A repressor protein combines with lactose.
2. What term describes a DNA sequence that allows a gene to be transcribed?
A) exon
B) promoter
C) operon
D) intron
3. Which is not a part of an operon?
A) promoter
B) operator
C) intron
D) structural gene
4. What is the function of transcription factors in eukaryotic cells?
A) They control the expression of certain genes.
B) They bend the DNA to bring it close to the operator.
C) They produce the TATA box.
D) They help RNA polymerase know where a gene starts.
5. What does not happen during mRNA processing?
A) Introns are cut out.
B) A cap and tail are added.
C) Exons are removed.
D) Exons are spliced together.