1
Question
Which of the following is not produced by E.Coli in the lactose operon?
Which of the following is not produced by E.Coli in the lactose operon?
Open in App
Solution
The correct option is C Lactose dehydrogenase
The lac operon is an operon responsible for transport and metabolism of lactose in Escherichia coli and other bacteria. It has three structural genes. The lac Z gene codes for β-galactosidase which converts lactose into glucose and galactose. Thus, E. coli cells with a mutated Z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because they cannot synthesize functional β-galactosidase. The lac Y gene that codes for β-galactoside permease which transports lactose into the cell. The lac A gene codes for β-galactoside transacetylase. Lactate dehydrogenase is found in nearly all living cells. Its function is to catalyze the conversion of pyruvate to lactate. It is not a part of lac operon. Option C is correct answer.
The lac operon is an operon responsible for transport and metabolism of lactose in Escherichia coli and other bacteria. It has three structural genes. The lac Z gene codes for β-galactosidase which converts lactose into glucose and galactose. Thus, E. coli cells with a mutated Z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because they cannot synthesize functional β-galactosidase. The lac Y gene that codes for β-galactoside permease which transports lactose into the cell. The lac A gene codes for β-galactoside transacetylase. Lactate dehydrogenase is found in nearly all living cells. Its function is to catalyze the conversion of pyruvate to lactate. It is not a part of lac operon. Option C is correct answer.
Suggest Corrections
0
Similar questions
View More
Join BYJU'S Learning Program
Explore more
Join BYJU'S Learning Program
