Which of the white blood cell types is usually the most numerous in the human body?

Recall lecture or your textbook reading: which wavelength range of UV light is “germicidal”, causing pyrimidine dimers to form (T-T or C-C) in DNA, so potentially damaging the DNA of bacteria and killing them?

How can our normal microbiota help minimize infections by pathogens?

What specifically would happen to an individual human who lost their helper T cells?  Provide a real-world example of this.

Which gland shrinks in size during adulthood but has hormones that function in maturation of T lymphocytes?

Sulfonamides are analogs of PABA and, as a result, they inhibit _____ synthesis. 


Your patient has been on antibiotics for 6 weeks after a case of streptococcal endocarditis, an infection of the inner heart wall.  The infection clears up.  However, the patient just visited you again. this time about a urinary tract infection, and the lab reports that the culprit this time was E. coli, a different bacterial species from the original infection. What do you hypothesize happened in this situation?  

Mycobacterium tuberculosis has chemicals in its cell wall that inhibit the fusion of phagocytic vacuoles with lysosomes.  Which statement is then most likely to be true?  

The term _________ is given to any foreign substance that stimulates a specific immune system response. 

Human red blood cell types involve all of the following EXCEPT: