A 9-month-oId infant is seen by a physician because of a persistent skin infection. His white and red blood cell counts are normal. However, immunofixation electrophoresis indicates a low level of IgG. When the infant returns to the physician for a follow-up visit in a month, his IgG level has increased. What condition do these results indicate?
A. Severe combined immunodeficiency
B. Transient hypogammaglobulinemia
C. Common variable immunodeficiency
D. DiGeorge anomaly
Ans: B. Transient hypogammaglobulinemia
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What is the difference between a genetically modified organism and a transgenic organism?
A. A transgenic organism contains only genes from other species, while a genetically modified organisms contains genes from its own species and genes from other species. B. A genetically modified organism is an organism that contains any foreign genes, while a transgenic organism has foreign genes that come from another species. C. A transgenic organism is an organism that contains foreign genes, while a genetically modified organism has foreign genes that come from another species. D. There is no difference between the two terms, they mean the same thing.
Gram-positive bacteria
a. have a thick cell wall, which retains crystal violet dye b. contain teichoic acids in their cell walls d. appear purple after Gram staining d. all of the above
The recent National Health and Nutrition Examination Survey found a 275% greater risk of what disease for individuals who consumed more than 25% of their daily calories from added sugars?
A) diabetes B) cardiovascular disease C) stomach cancer D) hypertension
The honey possum (Tarsipes rostratus) is a tiny Australian marsupial that feeds entirely on nectar. Which of the following terms describes the role of a honey possum in its ecosystem?
A. primary carnivore B. herbivore C. detritivore D. primary producer E. secondary carnivore