Which of the following substances produced and secreted by some bacteria allow the organisms to move through host cell membranes to enter host cells?

Monoclonal antibodies may be useful someday for developing antibody-based quick identification tests for the SARS-CoV-2 coronavirus. Monoclonal antibodies are made by fusing an antibody-producing cell with a _____.

Which of the following drugs would be most suitable for treating an infection of the cestode Taenia?

CASE 4:  A 26-year old female arrives at the clinic complaining of genital itching. The patient history reveals that she is unmarried and moderately sexually active. A vaginal swab examined under the microscope reveals numerous budding cells lacking flagella. Normal flora in the vagina typically inhibit fungal growth by _____, which is a form of microbial antagonism.

This figure depicts which of the following antibody-mediated responses?

Which chemical triggers the inflammatory response?

CASE 1:  A 40-year-old hospital patient begins complaining of painful urination. She had been admitted to the hospital three days prior for a surgical procedure that required the use of a catheter. A urine specimen is collected and analyzed. Pink cells in the Gram stain suggest that the pathogen is E. coli. Blood tests suggest that the patient has elevated levels of activated complement proteins. Given the diagnosis, what may be causing the complement activation?

Both Enterobius and Dirofilaria would be classified as _____.

Acid (pH less than 7) is present and used as a defense in all of the following body locations EXCEPT:

As scientists and healthcare professionals are learning, SARS-CoV-2 (the COVID-19 coronavirus) is spread by respiratory droplets and is associated with fever, cough, and difficulty breathing that last about two weeks in some symptomatic humans. Which of the following identifies the etiology of this disease?