An E. coli cell without a functional lacI gene is expected to _____

A) never produce ?-galactosidase
B) always produce ?-galactosidase
C) be unable to transport lactose into the cell
D) be unable to metabolize lactose within the cell


Answer: B

Biology & Microbiology

You might also like to view...

An agent that causes genetic mutations is called __________

a. a carcinogen b. cancer c. a virus d. a malignant tumor

Biology & Microbiology

The geologist who, in 1830, renewed the idea of uniformitarianism by showing gradual changes in some organisms that were found in successive fossil layers was

A. Georges-Louis Buffon. B. Charles Darwin. C. James Hutton. D. Jean Lamarck. E. Charles Lyell.

Biology & Microbiology

During DNA replication, what is the function of RNA primase?

What will be an ideal response?

Biology & Microbiology

Which statement concerning phytochrome-induced responses is false?

a. All responses are very rapid and short-term. b. Red light causes potassium channels to open. c. The absorption of light by one part of the phytochrome molecule triggers a conformational change in another part. d. Phytochrome activates transcription of the gene for a subunit of rubisco. e. Far-red light causes potassium channels to close.

Biology & Microbiology