Drug addiction occurs when the central nervous system
A. initiates new cell growth that depends on continual input of the drug.
B. stores the drug between neurons in the cerebral cortex for later use.
C. uses the drug as its sole neurotransmitter.
D. adjusts to the increased firing of neurons by reducing the number of membrane receptors in postsynaptic membranes.
Answer: D
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What is the purpose of cyclic electron flow?
a. to prevent the formation of NADPH and excessive reactive oxygen species b. to prevent the loss of light energy when the ATP production pathway is saturated c. to ensure that all of the energy harvested by the sun is converted into ATP d. to protect the cell when CO2 is unavailable and the Calvin cycle is not operating e. to increase the net production of ATP in times when CO2 is unavailable
The polymerase chain reaction (PCR) has advanced our understanding of systematics because it allows for ____
a. analysis of morphological traits b. analysis of small amounts of DNA from museum specimens and fossils c. the reconstruction of entire individuals from a small amount of DNA d. the reconstruction of entire individuals from a small amount of RNA e. the analysis of an entire genome from a small fossil fragment
The trachea, due to its location in the body, is considered to be part of both the upper and lower respiratory tract.
Answer the following statement true (T) or false (F)
A 20 m wide edge disrupts a smaller fraction of a small habitat patch than that of a large habitat patch
a. True b. False