In domestic animals, “mad cow disease” is caused by:
a. Viruses
b. Viroids
c. Prions
d. None of the above
Answer: c. Prions
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Which of the following is not one of the three most common causes of bacterial meningitis?
A) Escherichia coli B) Haemophilus influenzae C) Neisseria meningitidis D) Streptococcus pneumoniae
An ________ pathogen can cause disease in a host with impaired resistance.
Fill in the blank(s) with the appropriate word(s).
Sound frequencies are measured in hertz (cycles per second). The more cycles per second, the higher the pitch. The wife of the 50 year old carpenter says that her husband is hard of hearing and should see a doctor. The husband says there’s nothing wrong with him, he just has trouble with high-pitched, female voices. Based on the data, who is right?
1.The wife; her husband does indeed have a reduced ability to hear across a range of sounds.
2.The husband; his hearing loss is only in the higher frequencies.
Clostridium tetani, the bacterium that causes tetanus, can survive in soil for up to 40 years. It is most likely in which of the following structures?
A. a cell membrane B. a nucleus C. a cell wall D. a pilus E. an endospore