Are there ways to prevent cancer?
A. No, cancer cannot be prevented; it can only be treated.
B. No, cancer cannot be prevented or treated.
C. Yes, cancer can be prevented, but only with intense exercise.
D. Yes, there are many ways cancer can be prevented, including through a healthy diet and exercise.
Answer: D
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The most abundant prokaryotic organism in the ocean is of the ________ genus
A) Pelagibacter B) Puniceispirillum C) Roseobacter D) Prochlorococcus
The transduction of sound waves into electrical signals takes place
A. within the tectorial membrane as it is stimulated by the hair cell. B. within hair cells as they are bent against the tectorial membrane, causing them to depolarize and release neurotransmitter that stimulates sensory neurons. C. as the basilar membrane becomes more permeable to sodium ions and depolarizes, initiating an action potential in a sensory neuron. D. as the basilar membrane vibrates at different frequencies in response to the varying volume of sounds. E. within the middle ear as the vibrations are amplified by the malleus, incus and stapes.
What could cause the lac operon to shut off after it has been activated?
A. The binding of the sugar lactose to the promoter B. The inactivation of RNA polymerase by the addition of a modified sugar C. The binding of the repressor to the operator after all the lactose is degraded D. The binding of the repressor to the promoter
Plants called legumes have chambers in their roots that house nitrogen-fixing bacteria. Nitrogen-fixing bacteria get both a place to live and energy while supplying nitrogen to a plant. What is this ecological relationship called?
A) Competition B) Parasitism C) Succession D) Predation E) Mutualism