Bioluminescence is controlled by the gene regulatory mechanism called quorum sensing, wherein the
A) depletion of oxygen is detected by an inducer molecule which activates transcription of the lux operon.
B) accumulation of an inducer molecule activates transcription of the lux operon.
C) absence of light activates an inducer molecule which activates transcription of the lux operon.
D) host tissues produce an autoinducer molecule which activates transcription of the lux operon.
Answer: B
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This enzyme cleaves both strands of DNA, swivels the ends of the broken strands to relieve the torsional stress, and then rejoins the strands.
A. gyrase B. ligase C. ribonuclease D. catalase E. helicase
Fungi and animals belong to the domain ________
Fill in the blank(s) with correct word
If a fox eats a rodent that ate a smaller insect that ate a plant, the fox is a(n)
A) autotroph. B) secondary consumer. C) producer. D) primary consumer. E) tertiary consumer.
Alex has cold sores on his mouth. He can transfer the herpes virus to:
a. another person's genitals b. another person's mouth c. his own eyes d. all of the above