Thalidomide, now banned for use as a sedative in pregnancy, was used in the early 1960s by many women in their first trimester of pregnancy
Some of these women gave birth to children with arm and leg deformities, suggesting that the drug most likely influenced _____. A) early cleavage divisions
B) differentiation of bone tissue
C) morphogenesis
D) organogenesis
C
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Because the two strands of a DNA molecule are ________ to each other, either one can be used as a template to reconstruct the other.
A. identical B. antiparallel C. bound D. complementary
The thermocline is broken down by temperature changes that allow upwelling to occur.
Answer the following statement true (T) or false (F)
Both Streptococcus pneumoniae and Cryptococcus neoformans are causes of meningitis, and both are diagnosed by microscopic observation. How are they distinguished in the microscope?
A. Because Cryptococcus is a fungus, it will not react in the Gram stain, and the cells will always remain colorless. B. These organisms have different cellular arrangements; Streptococcus form chains, whereas Cryptococcus forms irregular clusters of cells. C. Cryptococcus is a fungus whereas Streptococcus is a bacterium; cells will be dramatically different in complexity and size. D. Streptococcus has a prominent capsule that can be observed by negative staining of the sample.
Failure to refrigerate a urine culture specimen when a long time will elapse between specimen collection and delivery to the laboratory is most apt to result in:
A) an abnormally high colony count B) an abnormally low white blood cell count C) contamination of the specimen by members of the patient's indigenous microflora D) death of the pathogen