Which of the following is NOT a community?
A. a group of different species living in a pond
B. a forest
C. a population of rabbits
D. a pine tree and the organisms that live on it
C. a population of rabbits
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Many human activities influence the amount of CO2 in the atmosphere. Why? Select all that apply
A. Logging removes trees that would otherwise use CO2 during photosynthesis. B. Burning vegetation (to make way for croplands) releases CO2 into the atmosphere. C. Using fossil fuels to power vehicles releases CO2 into the atmosphere. D. There is no evidence that human activities contribute to atmospheric CO2 levels.
Which of the following cell types conducts water most rapidly through a plant?
A. parenchyma cells B. sclerenchyma cells C. sieve tubes D. vessel members E. phloem
For every 10°C increase in temperature, the rate of most chemical reactions will
a. double. b. triple. c. increase by 100 times. d. stop.
Once a prion enters a nerve cell, it essentially
A) assumes the correct folding orientation for the protein. B) stops the cascade of misfolding events associated with adjacent cells. C) becomes self-propagating, causing misfolding of nearby normal proteins. D) differentiates into a nonreplicating virus. E) differentiates into a replicating virus.