The chancre of syphilis
A. occurs during the tertiary stage.
B. develops into a lesion with firm margins and an ulcerated central crater.
C. is very painful.
D. occurs due to small hemorrhaging of capillaries.
E. All of the choices are correct.
Answer: B
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Microarrays, hybridization tests, and ribotyping are increasing in frequency in their use in clinical labs for diagnosis of infectious diseases and the microorganisms causing them. Why is this?
A. They are cheaper than biochemical tests. B. They have greater specificity for the organism because they employ specific antibody. C. The tests are more easily performed in a doctor's office or hospital, right there where the specimens are taken. D. Genomic testing has less errors compared to biochemical tests and serological tests.
The term radappertization is used to describe food preservation by ________.
A. gamma irradiation B. heat C. chemicals D. UV irradiation
In a cell, the concentration of glucose-6-phosphate is 83 ?M and of fructose-6-phosphate is 14 ?M. The ?G°' = 410 cal/mol for the conversion of glucose-6-phosphate to fructose-6-phosphate. Based upon this information, the ?G' for this reaction (in cal/mol) is
A) -644. B) -63.7. C) 0. D) 27. E) 644.
Although especially useful to the giraffe, the rete mirabile is similar to a countercurrent heat exchange system in other related, less evolved, mammals. Thus a mechanism for _________________ homeostasis is likely to have evolved from a mechanism previously used for __________________ homeostasis.
A. blood pressure; pH B. temperature; blood pressure C. blood pressure; temperature D. pH; blood pressure Adult giraffes can be up to 20 ft. tall, and thus require special adaptations to maintain appropriate blood pressure. One adaptation is the rete mirabile, a group of blood vessels that form a web or net-like structure to slow blood flow.