Resident flora are found in/on the A. skin. B. mouth. C. nasal passages. D. larg

Question

Resident flora are found in/on the A. skin. B. mouth. C. nasal passages. D. large intestine. E. All of the choices arc correct. Regarding normal flora, select the false statement. A. Within the body, they help prevent pathogenic bacterial overgrowth. B. The microbial flora constantly changes in composition. C. Normal flora are parasites that do not benefit humans. D. Colonization with normal flora starts right after birth. E. According to the hygiene hypothesis, normal flora stimulate the immune system. Regarding neutrophils, select the false statement. A. Neutrophils are effective at phagocytosing and destroying foreign material. B. Neutrophils are the most abundant and active granulocyte. C. Neutrophils account for more than 50% of the leukocytes in blood. D. Neutrophils target host cells that are missing MHC-I. E. Dead neutrophils make up the majority of pus. Regarding dendritic cells (DCs), select the false statement. A. DCs are present in higher numbers in sites where there is greater risk of microbial infection. B. DCs present antigen to cells in the adaptive arm of the immune system. C. DCs deliver the first signal leading to the activation of CD4+ T Lymphocytes. D. DCs activate T cells based on antigen receptor specificity and recognition. E. DCs present antigens only with MHC-II. Which molecules initiate the classical and lectin pathways of the complement system, respectively? A. Antigen and C3 B. C3a and C5a C. Antibody and Mannan Binding Protein D. Antibody and C3 E. CI and antibody Regarding eosinophils, select the true statement. A. Eosinophils are the first responders to sites of inflammation. B. Eosinophils are key lighters of parasitic infection. C. Eosinophils can form long-term memory. D. Eosinophils have no role in allergic responses. E. Eosinophils offer co-stimulation to B cells. ___ is capable of opsonizing target cells. Select two. A. C5a B. antibodies C. Cl D. C3b

Explanation / Answer

Answer

10).E. All of the choices are correct

Explanation.

Resident microbiota typically colonize the surface of the skin, mucous membranes, digestive tract, upper respiratory system and distal portion of the urogenital system. These microbes do not typically harm the host, while they benefit from feeding on the cellular waste and dead cells of the host's body

11). C. Normal flora are parasites that do not benefit humans

Explanation.

Many normal flora provide direct benefits, such as making vitamins or aiding digestion. Even if normal flora microbes merely take up space and resources, they help prevent pathogens (disease causing microbes) from easily invading the body and causing illness.

12). D. Neutrophils target host cells that are missing MHC-1

Explanation.

Natural killer cells recognise the host cells that are missing MHC-1.

Related Questions

Navigate

• Browse (All)
• Browse R
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.