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Question 592 pts

Which of the following hypersensitivities is responsible for the outbreak that occurs when someone is exposed to poison oak.

Group of answer choices

Immediate IgE-mediated

Cytotoxic

Immune complex-mediated

Delayed cell-mediated

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Question 602 pts

Due to vigorous worldwide vaccination programs, which of the following diseases has been eradicated

Group of answer choices

Measles

Chickenpox

Small pox

Polio

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Question 612 pts

The largest number of microorganisms reside in/on th

Group of answer choices

mouth

skin

small intestine

large intestine

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Question 622 pts

Which of the following microbes are members of the skins normal flora

Group of answer choices

Diphtheroids

Propionobacterium

Staphylococcus

all of the above

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Question 632 pts

High sugar diets contribute to tooth decay and gum disease because of which of the following reasons

Group of answer choices

Sugar encourages the growth and activity of bacteria in the mouth

Sugar discourages the normal flora of the mouth

Sugar eats away at the tooth's enamel

Sugars are acidic

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Question 642 pts

Which of the following white blood cells recognizes the major histocompatibility complex (MHC) molecules of the antigen presenting cells?

Group of answer choices

T-helper cells

natural killer cells

macrophages

dendritic cells

Answer 1

592)- Immediate IgE-mediated. IgE mediated reactions usually cause symptoms of sneezing, cough, vomiting, diarrhea and hypotension that are suggested help expel the noxious substance from the body.

602.) Small pox . Two infectious diseases have successfully been eradicated: smallpox and rinderpest. There are also four ongoing programs, targeting poliomyelitis, yaws, dracunculiasis, and malaria.

622) all of the above.  The varied environment of the skin results in locally dense or sparse populations, with Gram-positive organisms (e.g., staphylococci, micrococci, diphtheroids) usually predominating.Propionibacterium species are pleomorphic, occasionally branching bacilli that are normal flora of the skin, conjunctiva, external ear canal, and exposed mucous membranes. On the skin, this organism colonizes hair follicles and sebaceous glands.

642)  T-helper cells. The recognition of antigen as a small peptide fragment bound to an MHC molecule and displayed at the cell surface is one of the most distinctive features of T cells, and will be the focus of this part of the chapter. How peptide fragments of antigen become complexed with MHC molecules