__________ is growth in response to a mechanical stimulus, such as contact with a solid object
a. Heliotropism
b. Phototropism
c. Gravitropism
d. Thigmotropism
e. Geotropic bending
D
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How do eukaryotic cells maintain underwound DNA?
A. They have a topoisomerase that can introduce negative supercoils. B. They can introduce negative supercoils by wrapping the DNA around proteins. C. They only relax the positive supercoils that form during transcription and let the negative ones accumulate. D. All of these choices are correct. E. None of these choices is correct.
What term refers to the renewal of a natural
ecosystem that has been degraded?
a. ecological balance b. ecological restoration c. eutrophication d. biological magnification e. bioremediation
Which trait is the best example of an adaptation?
A) A mutation resulting in a heat-resistant enzyme in a bacterium living in a hot spring B) A mutation resulting in weak branches in a species of tree that lives in windy regions C) A new mutation that confers Tay-Sachs disease in humans D) A shorter neck in a giraffe that lives in an area with many rival males and tall trees E) A longer tongue in an insect-eating mammal that feeds on insects that live in shallow burrows
Your friend is having difficulty keeping track of the energy flow from glucose through glycolysis, the Krebs cycle, and electron transport. Your best advice would be to
A. follow the protons. B. follow NAD+ production. C. follow the electrons. D. follow ATP production.