Which disorder is caused by a bacterial infection resulting in lung edema that makes it difficult to breathe?
a. pneumonia
b. influenza
c. tuberculosis
d. lung cancer
e. emphysema
ANSWER: a
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Why are viroids resistant to nucleases?
A. Having a circular RNA "genome," they are resistant to the digestion of most exonucleases (that nibble/digest the free ends of RNA or DNA). B. Having a circular RNA "genome," with no protein shell, they are resistant to the protein-degrading activities of nucleases. C. Nucleases will only digest DNA, not RNA-so viroids are protected. D. Viroids have only been identified in plants. Plant nucleases cannot digest RNA.
What is the role of calcium ions during contraction of a skeletal muscle?
What will be an ideal response?
A pathogenic virus has a new mutation in one of the coat proteins, that just happens to resemble the structure of a normal human protein present in glial cells of the CNS. What do you predict may be an outcome of infection by this virus?
A. The initial response to the virus will be strong, but will then be shut down by immunological tolerance. B. An autoimmune disease of the brain may develop. C. The innate immune system will ignore the pathogen, but the acquired immune system will attack it. D. The membrane attack complex will be unable to burst the viral membrane.
Cortisol and aldosterone are secreted by the ________
Fill in the blank(s) with correct word