A 13-year-old girl visited the urgent care with a 3-day history of fever of 103°F, severe chills and fatigue. She has reported that her symptoms began as nasal congestion and cough exactly five days ago when she was in school. She has mentioned that children in her art class were also having similar symptoms. Since her nasal swab came back negative for infections of streptococcus and major viruses (COVID, Flu), she was treated with over-the-counter medications along with hydration and rest.  Her symptoms cleared after a week. The following graph shows different models (A,B and C; color coded with the curves) for the progression of disease over time. Which of the disease models, A,B or C represent the above case study?  

A person can contact Hepatitis A by sharing needles with another person infected with the same disease.

Which of the following statements is correct about viruses?

A patient is admitted to the hospital with symptoms of high fever and chills which recur in a periodic fashion.  A blood test conducted shows the following picture of infected red blood cells from the patient. It shows red blood cells with ring-like formations inside them. Assuming that the ring-like formation is because of infection with a microorganism, which of the statements below are correct about the causative agent of this infection? Pick all correct answers for complete credit.

Match the different classes of antibodies with their function.

————-, ————-, & ————— are the three domains of life.

The following graph shows the CD4 T cell counts and viral concentration in blood during the course of HIV infection. Which of the following statements are correct about the phase A? Select all correct answers for complete credit.

A person is infected with the organism shown in the picture.  Which of the following statements are correct with respect to this organism? Select all correct answers for complete credit.  

The bacterium shown in the picture has a mutation in the gene that encodes the part labeled “A” . As a result of this mutation, A is no longer functional. If this were to be the case, which of the following would most likely happen?  

Which of the following shows the CORRECT order of events that must occur for the production of antibodies from B cells? 1. Production of antibodies  2. Clonal expansion of B cells 3. Binding of antigen to B cell receptors 4. Differentiation of B cells into plasma and memory B cells 5. Exposure to antigen