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Below are two statements:
Statement I: In an E. coli cell, lac operon activity must be low.
Statement II: Lactose is transported into bacteria by the permease enzyme.
Based on the above statements, select the most appropriate answer.
Option: 1
Statements I and II are both correct
Option: 2
Statements I and II are both incorrect
Option: 3
Statement I is correct but Statement II is incorrect
Option: 4
Statement I is incorrect but Statement II is correct
Answers (1)
- Without glucose, Lactose serves as an alternate Carbon source. Hence, Statement I is correct.
- However, Lactose transport into the E. coli cell requires a permease enzyme, which is controlled by the lac operon.
- Therefore, a low level of lac operon activity is necessary for E.coli cells at all times making Statement II a correct statement.
- Three genes make up the lac operon, a polycistronic structural gene:
- The 'z' code represents β-galactosidase
- The 'y' code represents Permease
- The 'a' code represents a Transacetylase
- Lactose can enter E. coli cells with the Permease enzyme, which increases permeability.
- Hence, option 1 is the correct answer.
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