A population of rabbits introduced to an island grows rapidly for a few years, and then growth slows and stabilizes. The population becomes stable because:
A) environmental resistance declined. B) the intrinsic rate of increase has declined.
C) immigration was reduced. D) the carrying capacity has been reached.
Answer: D
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Which of the following was a direct result of the development of agriculture?
1.Decreased limiting factors such as disease 2.Expanded geographic range 3.Increased carrying capacity 4.Increased population growth rate
What happens next after the hormone glucagon binds to a G-protein coupled receptor (GPCR)?
A. The glucagon enters the cell through the GPCR and diffuses to the nucleus where it interacts with transcription factors. B. The G-protein loses GDP and gains GTP becoming activated. C. The G-protein loses GTP and gains GDP becoming activated. D. The G-protein loses GTP and gains GDP becoming inactivated. E. The G-protein loses GDP and gains GTP becoming inactivated.
Arsenic is a poison that binds to a molecule needed to build acetyl CoA. Based on this information, which part of cellular respiration would be stopped if arsenic were ingested?
A) glycolysis B) citric acid cycle C) electron transport chain D) ATP synthase
Which of the following is considered a new emerging infectious disease?
A. Polio B. Malaria C. Cholera D. SARS E. Smallpox