When does an infection become a disease?
What will be an ideal response?
Answer: An infection becomes a disease when a microorganism that is established and growing in a host causes damage and injury that impairs host function.
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Most systemic mycoses are acquired from ________.
A. insect vectors B. inhaling spores C. puncture wounds D. All of the choices are correct.
A person who is homozygous for a mutation of the phenylalanine hydroxylase gene
A. can lead a normal life if the environment is controlled. B. cannot give blood. C. will always develop mental retardation in early infancy. D. will require phenylalanine supplements throughout life. E. Two statements are correct. They can lead a normal life if the environment is controlled by taking phenylalanine supplements.
A sudden loud sound such as an explosion is most likely to impair hearing by damaging which of the following?
a. hair cells in the organ of Corti b. the vestibular nerve c. the utricle and saccule d. the otoliths e. the endolymph
Which of the following shows the steps of a viral infection in the proper order?
A) virus locates host cell ? enters nucleus ? alters host cell DNA ? destroys cell membrane B) virus locates host cell ? alters host cell DNA ? host cell produces copies of virus ? copies enter host cell nucleus ? nucleus leaves cell C) virus locates host cell ? penetrates cell membrane ? enters nucleus ? alters host cell DNA ? host cell produces copies of virus D) virus locates host cell ? forms hydrogen bonds ? changes DNA to RNA? host cell produces copies of virus