Why are systemic fungal infections seen only in a subset of the population, even though most people contact fungi and fungal spores in soil and dust all of the time?
Contrast the epidemiology of systemic fungal infections with giardiasis, which infects virtually everyone that comes in contact with the pathogen.
What will be an ideal response?
Answer: Most of the population has sufficient immunity to common soil fungi to prevent disease, thus only immunocompromised people are susceptible to systemic fungal infections. In contrast, most of the population has NO natural immunity to Giardia intestinalis, so that any contact with the pathogen results in disease. This is why most fungi that cause systemic infections are called opportunistic pathogens.
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Even though the autumn may be unusually warm, the leaves from deciduous trees begin to drop during September
Which of the following is the best explanation? a. The trees are responding to shorter days. b. The autumn months are usually wetter because the summer rains were delayed. c. The effects of phototropism are operating "right on schedule." d. There is not enough sunlight to carry on photosynthesis any longer.
e. The trees are responding to consistent temperatures.Roots are involved in all EXCEPT which activity?
a. support b. food storage c. food production d. anchorage e. absorption and conduction
Together, the stomach, intestines, mouth, and esophagus form a(n)
A) ectotherm. B) organ system. C) cell. D) organ. E) tissue.
Next to plasmids, the most common type of cloning vector is a ________
Fill in the blank(s) with correct word