Which glial cell(s) is/are only found in the peripheral nervous system?
a. Schwann cells
b. oligodendrocytes
c. astrocytes
d. microglia
e. saltatory cells
ANSWER: a
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An egg of the organism of S. mansoni is isolated from the feces of an adult man who has been traveling in Africa. An unoperculated egg with a large lateral spine is recovered. The patient is administered the standard dose of praziquantel; however, his infection does not improve. Which one of the following statements explains this discrepancy?
a. Metrifonate should have been adminis-tered. b. Bilarcil is the drug of choice for this type of infection. c. Steroids should have been initially admi-nistered. d. A larger dose may be required to be effec-tive against this organism.
Which disease is incorrectly matched with the causative agent?
A. fish ick-a ciliate B. African sleeping sickness-a trypanosome C. malaria-an amoebozoan D. fish kills-dinoflagellate
Explain why a food web gives a better picture of a community than does a food chain
What will be an ideal response?
James is a 42-year-old man with hemophilia, a sex-linked recessive condition. His daughter, Susan, who has normal blood clotting, is married to Fred who also has hemophilia. Susan and Fred are expecting their first child and an ultrasound shows that the fetus is male. What is the approximate probability that their new son will have hemophilia?
A. 1/4 B. 1/2 C. 1 (100%) D. 3/4 E. 2/3