When an environmental stimulus is received, the signal is usually transmitted through three types of nerves cells. In which order is the signal transmitted through these cells?
A. sensory neurons, motor neurons,
interneurons
B. motor neurons, sensory neurons,
interneurons
C. sensory neurons, interneurons, motor
neurons
D. interneurons, sensory neurons, motor
neurons
E. motor neurons, interneurons, sensory
neurons
C
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Essay on the Principle of Population, written by Thomas Malthus in 1798, influenced Darwin's thoughts as he struggled to understand what mechanisms could be at work to produce evolution. Malthus proposed that populations of animals and plants, including humans,
A. increased arithmetically in numbers while the nutrients available only increased geometrically. B. evolved from islands to mainland, thus explaining why unrelated species on the mainland are found in the same location. C. increased geometrically in numbers while the nutrients available only increased arithmetically. D. decreased arithmetically in numbers while the nutrients available increased geometrically. E. evolved from mainland to islands, thus explaining why the island flora and fauna resembled the mainland species so closely.
Clostridium perfringens infections are commonly associated with:
A. antibiotic treatment. B. immunosuppression. C. preexisting lung disease. D. contamination of wounds. E. consumption of water contaminated with sewage.
Analysis of a patient's lung tumor reveals that all of the malignant cells in this tumor have a specific chromosomal abnormality involving a fusion event between two sets of chromosomes. This MOST likely suggests that
a) This mutation was inherited. b) The tumor is polyclonal. c) The tumor is monoclonal in origin. d) A large number of normal cells simultaneously underwent this mutation.
NAD and FAD act as _____ carriers
Fill in the blank(s) with the appropriate word(s).