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
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An agent that causes genetic mutations is called __________
a. a carcinogen b. cancer c. a virus d. a malignant tumor
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.
During DNA replication, what is the function of RNA primase?
What will be an ideal response?
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.