Cellular Control (OCR A-Level Biology A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What must bind to a promoter region to allow RNA polymerase to initiate transcription?
What must bind to a promoter region to allow RNA polymerase to initiate transcription?
Transcription factors
How many genes can oestrogen receptors (ERα) initiate transcription for when activated?
How many genes can oestrogen receptors (ERα) initiate transcription for when activated?
Up to 100 genes
In the lac operon, what is the function of the operator region?
In the lac operon, what is the function of the operator region?
Repressor protein binding site
When does the lac operon become active to transcribe genes for lactose metabolism?
When does the lac operon become active to transcribe genes for lactose metabolism?
Low glucose and lactose present
Which sequences in genes are coding regions that encode polypeptides?
Which sequences in genes are coding regions that encode polypeptides?
Exons
What catalyzes the removal of introns from primary mRNA during splicing?
What catalyzes the removal of introns from primary mRNA during splicing?
snRNPs
What would happen if introns were not removed from mRNA before translation?
What would happen if introns were not removed from mRNA before translation?
Non-functional proteins produced
What role does cyclic AMP play in cellular regulation?
What role does cyclic AMP play in cellular regulation?
Second messenger
What is an allosteric site on an enzyme?
What is an allosteric site on an enzyme?
Regulatory site separate from active site
What inhibits glycogen phosphorylase after it breaks down glycogen?
What inhibits glycogen phosphorylase after it breaks down glycogen?
ATP and glucose-6-phosphate