Match the terms with their correct definition.
A. cell body
B. myelin sheath
C. dendrite
D. axon
E. nucleus
A. the part of a neuron that contains the major concentration of the cytoplasm and the nucleus.
B. white, fatty material that forms a covering over nerve fibers.
C. the part of a neuron that sends signals toward the cell body
D. elongated portion of a neuron that conducts nerve impulses away from the cell body.
E. a membrane bound organelle within a neuron that contains chromosomes and controls the structure and function of the cell.
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The dose of an antigen that kills 50% of animals in a test group and is used to estimate the virulence of a pathogen is known as
A) Antigen dose50. B) Virulence-50. C) LD50 (lethal dose50). D) Death rate-50.
What observational evidence do we have that some meteors are caused by debris from comets?
What will be an ideal response?
A researcher wants to mutagenize an organism. He is not in need of a large number of mutants but is more concerned with being able to find and then to amplify the mutated sequence. Which of the following would therefore be more useful?
A) ionizing radiation B) UV radiation C) transposon insertion D) a chemical mutagen E) search for spontaneous mutant
The complement system performs which of the following functions?
A) Facilitating and enhancing phagocytosis B) Bridging innate and adaptive immune responses C) Disposing of immune waste products D) All of the above