The lac operon is an example of ________ control in which the presence of an ________ is required for transcription to occur
A) negative / activator
B) negative / inducer
C) positive / activator
D) positive / inducer
Answer: B
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Which of the following is NOT a way that bacteria benefit humans?
A. production of foodstuffs such as cheese B. production of antibiotics C. breaking down wastes, toxins, explosives, and petrochemicals D. killing harmful insects E. transferring nutrients across intestinal membranes
In nature, most animals have young during seasons of abundant food. The timing of these events are
dictated by environmental cues and
a. metabolism. b. endocrine activity. c. catabolism. d. ecological events. e. thermodynamics.
Which autoimmune disease is incorrectly matched with the tissue it affects?
a. lupus ? blood b. type I diabetes ? pancreas c. multiple sclerosis ? nerves d. lupus – pancreas e. lupus – anemia
Careful, long-term studies conducted by Steve Hubbell and colleagues __________ for the proposal that spatial and temporal variation in gap formation caused by disturbance explains high diversity of tropical trees.
A) provide support B) fail to provide support