A nurse is caring for a client who has contact dermatitis after exposure to poison ivy. The nurse recognizes that this condition is mediated by what type of cells?

B cells

T cells

Mast cells

Answer and Explanation

The Correct Answer is B

Choice A reason:

B cells are not involved in contact dermatitis, as they do not produce antibodies or form immune complexes.

Choice B reason:

T cells are the type of cells that mediate contact dermatitis, which is a type of type IV hypersensitivity. T cells recognize the poison ivy antigens that bind to the skin proteins and release cytokines that recruit macrophages and other inflammatory cells. This leads to a delayed and localized reaction that manifests as erythema, edema, vesicles, and pruritus.

Choice C reason:

T cells are not the same as B cells, as they have different receptors and functions in the immune system.

Choice D reason:

Mast cells are not involved in contact dermatitis, as they do not express IgE antibodies or release histamine.

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Correct Answer is A

Explanation

Choice A reason:

Gram-positive cocci are bacteria that have a spherical shape and stain purple with Gram stain due to their thick peptidoglycan cell wall. Streptococcus pyogenes is an example of gram-positive cocci that can cause infections such as pharyngitis, impetigo, cellulitis, necrotizing fasciitis, or rheumatic fever.

Choice B reason:

Gram-negative cocci are bacteria that have a spherical shape and stain pink with Gram stain due to their thin peptidoglycan cell wall and outer membrane. Neisseria gonorrhoeae and Neisseria meningitidis are examples of gram-negative cocci that can cause infections such as gonorrhea, meningitis, or septicemia.

Choice C reason:

Gram-positive bacilli are bacteria that have a rod-shaped shape and stain purple with Gram stain due to their thick peptidoglycan cell wall. Bacillus anthracis and Clostridium botulinum are examples of gram-positive bacilli that can cause infections such as anthrax, botulism, or tetanus.

Choice D reason:

Gram-negative bacilli are bacteria that have a rod-shaped shape and stain pink with Gram stain due to their thin peptidoglycan cell wall and outer membrane. Escherichia coli and Pseudomonas aeruginosa are examples of gram-negative bacilli that can cause infections such as urinary tract infection, wound infection, or sepsis.

A. Bacteria B. Viruses C. Fungi D. Parasites

Correct Answer is C

Explanation

Choice A reason:

Bacteria are microorganisms that have a cell wall composed of peptidoglycan and a cell membrane composed of phospholipids. They can be classified by their shape (cocci or bacilli), their Gram stain (positive or negative), or their oxygen requirement (aerobic or anaerobic).

Choice B reason:

Viruses are microorganisms that have a nucleic acid core (DNA or RNA) surrounded by a protein coat (capsid) and sometimes an envelope derived from the host cell membrane. They can only replicate inside living cells and cause various diseases such as influenza, herpes, hepatitis, or AIDS.

Choice C reason:

Fungi are microorganisms that have a cell wall composed of chitin and a cell membrane composed of ergosterol. They can exist as yeasts or molds depending on the environmental conditions. Candida albicans is an example of fungi that can cause infections such as thrush, vaginitis, or systemic candidiasis.

Choice D reason:

Parasites are microorganisms that live on or in another organism (host) and derive nutrients from it. They can be classified by their size (protozoa or helminths) or their mode of transmission (vector-borne or direct contact). They can cause infections such as malaria, giardiasis, or schistosomiasis.

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A nurse is caring for a client who has contact dermatitis after exposure to poison ivy. The nurse recognizes that this condition is mediated by what type of cells?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A nurse is caring for a client who has an infection caused by Streptococcus pyogenes. The nurse understands that this microorganism belongs to what group of bacteria?

Correct Answer is A

Explanation

A nurse is caring for a client who has an infection caused by Candida albicans. The nurse understands that this microorganism belongs to what group of microorganisms?

Correct Answer is C

Explanation

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