Which one of the following types of immunoglobulins is involved in inflammatory and allergic responses?
IgD
IgE
IgG
IgM
The Correct Answer is B
A. IgD: Immunoglobulin D (IgD) is found on the surface of B cells and serves as a receptor for antigen recognition during the immune response. Its exact function is not fully understood, but it plays a role in the activation of B cells.
B. IgE: Immunoglobulin E (IgE) is primarily associated with allergic responses and defense against parasitic infections. When an allergen enters the body, IgE antibodies trigger the release of histamine and other chemicals, leading to allergy symptoms. IgE is also involved in protecting against certain parasites.
C. IgG: Immunoglobulin G (IgG) is the most abundant immunoglobulin in the bloodstream. It provides long-term immunity by recognizing and neutralizing pathogens such as bacteria and viruses. IgG antibodies are involved in secondary immune responses and are transferred from mother to fetus, providing passive immunity.
D. IgM: Immunoglobulin M (IgM) is the first antibody produced during an initial immune response to an antigen. It is effective at agglutination (clumping) of pathogens. IgM antibodies are generally found in blood and lymph fluid and are the first line of defense during infections.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["B","D"]
Explanation
A. Hypertension: Anaphylaxis often leads to a rapid drop in blood pressure (hypotension) rather than hypertension. Hypotension is a more common symptom because of the severe vasodilation that occurs during anaphylactic reactions.
B. Angioedema: Yes, angioedema is a common clinical manifestation of anaphylaxis. Angioedema involves swelling of the deeper layers of the skin, often around the eyes and lips. It can also affect the throat, which can be life-threatening due to airway obstruction.
C. Petechiae: Petechiae are small red or purple spots that appear on the skin and are caused by bleeding into the skin's tissues. They are not a typical manifestation of anaphylaxis.
D. Bronchospasm: Yes, bronchospasm is a hallmark clinical manifestation of anaphylaxis. It involves the sudden constriction of the airways, leading to difficulty in breathing and wheezing.
Correct Answer is A
Explanation
A. "Tetracycline inhibits protein synthesis."
Tetracycline inhibits bacterial protein synthesis by binding to the bacterial ribosomes, which are crucial for making proteins. This disruption in protein synthesis prevents bacterial growth and replication.
B. "Tetracycline blocks RNA synthesis."
Tetracycline primarily affects protein synthesis, not RNA synthesis. It binds to the 30S subunit of the bacterial ribosome and disrupts the translation process.
C. "Tetracycline degrades the bacterial cell wall."
Tetracycline does not target the bacterial cell wall. Drugs like penicillin and cephalosporins work by disrupting cell wall synthesis, but tetracycline operates differently by inhibiting protein synthesis.
D. "Tetracycline binds to magnesium ions."
Tetracycline does not specifically bind to magnesium ions. Its primary mode of action involves binding to the bacterial ribosome, as mentioned in the first correct statement.
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