Final exam Bio 251 week 8 verified questions and answers latest

Final exam Bio 251 week 8 verified questions and answers latest Which of the following statements about how the skin prevents disease is false? a) salt in sweat retards microbial growth b) the skin is the most common route for organisms to penetrate the body c) oil glands on the skin make it waterproof d) native microbes that live on your skin help protect you from infection - CORRECT ANSWER-b) the skin is the most common route for organisms to penetrate the body This antimicrobial protein is found at high levels in lacrimal secretions (tears) a) lysozyme b) defensins c) sebum d) C3b - CORRECT ANSWER-a) lysozyme Which component of the compliment system would stimulate neutrophils to phagocytize an attached cell? a) C5a b) C5b c) C3a d) C3b - CORRECT ANSWER-d) C3b Which of the following would prevent a microbe from activating the Alternative pathway of the compliment system? a) a bacteria that has an enzyme that degrades antibodies b) a bacteria that has a thick cell wall c) a bacteria that can prevent C3b from binding to it d) a bacteria that contain no mannose - CORRECT ANSWER-c) a bacteria that can prevent C3b from binding to it Which of the following is NOT a feature of the skin that allows it to serve as a barrier to infection? a) melanin in the skin is toxic to a bacteria b) sweat creates a sling environment that prevents non-halotolerant bacteria from growing c) tight junctions in keratinocytes make the skin waterproof d) resident flora produce bacteriocins - CORRECT ANSWER-a) melanin in the skin is toxic to a bacteria The immune system cell most commonly associated with allergies is: a) neutrophil b) eosinophil c) basophil d) macrophage - CORRECT ANSWER-c) basophil Which of the following would be an example of a PAMP? a) GaGs on the surface of eukaryotic of a PAMP b) C3b bound to bacteria c) peptidoglycan d) tissue factor - CORRECT ANSWER-c) peptidoglycan This cytokine is released by virally infected cells, anti-viral - CORRECT ANSWERinterferon Suppose that someone's blood stem cells in their marrow ware dividing and developing into B cells. What cytokine might be responsible for this? a) chemokines b) tumor necrosis factor c) colony stimulating factor d) interferon - CORRECT ANSWER-c) colony stimulating factor Which of the following cells would likely have Toll-like receptors (TLRs)? a) mast cells b) dendritic cells c) neutrophils d) T-lymphocytes e) hepatocytes - CORRECT ANSWER-mast cells, d