A positive latex agglutination test was observed in a sample containing Cryptococcus neoformans. The specimen of choice to identify this pathogen is:
a. urine.
b. blood.
c. stool.
d. cerebrospinal fluid (CSF).
D
C. neoformans is best identified in the CSF or serum with latex agglutination tests. Whole blood, stool, and urine are not appropriate specimens for identification purposes.
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While doing a pedigree analysis of a European royal family, you notice a disease in a female child of two healthy parents. There are also some cousins with the same genetic disease
If this disease is controlled by a single gene, then the most likely explanation for these observations would be: A. the disease is a spontaneous mutation. B. the disease is recessive and only seen in homozygous recessive individuals such as the daughter. C. the disease is dominant and only seen in homozygous dominant individuals such as the daughter. D. the disease is only seen in heterozygous individuals such as the daughter. E. the disease is dominant and is seen in homozygous dominant or heterozygous individuals.
About __________ percent of the CO2 in the blood is
transported __________. a. 60; dissolved in plasma b. 30; as bicarbonate c. 60; as bicarbonate d. 60; as carbaminohemoglobin e. 30; dissolved in plasma
Which scientist is credited with proposing in 1887 that an egg and a sperm fuse to form a zygote?
A. Muller B. Watson C. Crick D. Fleming E. van Beneden
There is a population of frogs living in a pond, 25 are green, 25 are brown, 25 are yellow with green spots and 25 are all yellow. A drought occurred and 75% of the frogs died. The remaining frogs were green and brown, after 25 generations the frogs still were green and brown, yellow frogs never appeared in the population again. Which of the following best explains this phenomenon?
A. Balancing selection. B. Founder effect. C. Bottleneck effect. D. Sexual selection. E. Heterozygote advantage.