Both B and T cells are originally derived from cells of the:
gut-associated lymphoid tissue.
bone marrow.
Thymus.
lymph nodes.
The Correct Answer is B
A. Gut-associated lymphoid tissue (GALT): GALT is a component of the mucosa-associated lymphoid tissue (MALT) and refers to the immune cells found in the gastrointestinal tract. These cells play a significant role in local immune responses in the gut.
B. Bone marrow: The bone marrow is the primary site of blood cell production in the body. It contains stem cells that can differentiate into various blood cells, including B cells. B cells mature in the bone marrow.
C. Thymus: The thymus is an organ located near the heart and is crucial for the development of T cells. T cells mature in the thymus, where they learn to recognize self from non-self antigens.
D. Lymph nodes: Lymph nodes are small, bean-shaped structures that produce and store cells that help fight infection. While they are essential parts of the immune system, B and T cells are not originally derived from lymph nodes.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Reddened tongue and gums: This side effect is not typically associated with ampicillin. However, certain medications or medical conditions can cause changes in oral tissues, leading to redness in the tongue and gums.
B. Digit numbness and tingling: Ampicillin does not commonly cause numbness and tingling in the fingers and toes. These symptoms can be associated with neurological issues or circulatory problems.
C. Bruising and petechiae: These symptoms can indicate bleeding disorders or low platelet count and are not usually caused by ampicillin. It's essential to investigate further if a patient experiences unexplained bruising or petechiae.
D. Skin rash and loose stools: Skin rash is a known side effect of penicillin-type antibiotics, including ampicillin. Loose stools or diarrhea can also occur due to disruption of the gut flora caused by the antibiotic. Patients should be aware of these possibilities and report any severe or persistent symptoms to their healthcare provider.
Correct Answer is A
Explanation
A. "Tetracycline inhibits protein synthesis."
Explanation: Tetracycline antibiotics interfere with bacterial protein synthesis by binding to the bacterial ribosomes. This binding prevents the attachment of transfer RNA (tRNA) to the messenger RNA (mRNA) complex, effectively inhibiting the production of proteins that are crucial for bacterial growth and replication.
B. "Tetracycline blocks RNA synthesis."
Explanation: This statement is incorrect. Tetracycline primarily affects protein synthesis, not RNA synthesis. It doesn't block the creation of RNA molecules in bacteria.
C. "Tetracycline degrades the bacterial cell wall."
Explanation: This statement is incorrect. Tetracycline antibiotics do not target bacterial cell walls. Agents like penicillins and cephalosporins are examples of antibiotics that disrupt bacterial cell walls.
D. "Tetracycline binds to magnesium ions."
Explanation: This statement is incorrect. Tetracycline does bind to certain metal ions, but it's not primarily through magnesium ions. The binding to bacterial ribosomes is a key mechanism of action for tetracyclines.
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