Unformatted text preview: to LacI and affect its structure so it can bind to the operator.
(e) None of the above are correct.
Question #66–69 (4 x 0.25 points) An E. coli mutant strain has the genotype lacI+ lacZ– lacY–. For each statement below specify
whether it is true or false by marking (a) for true and (b) for false.
Lacks the genes lacZ and lacY.
Can produce a functional regulator protein (LacI) for the lac operon.
Can import lactose when it is available in the environment.
Can synthesize lactose when absent from the environment
Question #70 (1 point) The amino acid lysine is synthesized by a bacterium in a several-step pathway. The lys operon,
lysABC, contains the genes lysA, lysB and lysC that code for the enzymes LysA, LysB and LysC.
These 3 enzymes catalyze the synthesis of lysine by the cell. At a site distant from the lys
operon, on the chromosome is the lysL gene expressing LysL constitutively. LysL changes
conformation when bound to lysine.
Which of the following is correct?
LysL binds to the lys operon’s operator in the absence of lysine in the environment.
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This note was uploaded on 01/21/2014 for the course BIOL 112 taught by Professor Benbasat during the Fall '04 term at UBC.
- Fall '04