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 B
Explanation
A. Antibiotics are prescribed according to culture and sensitivity reports:
When antibiotics are prescribed based on specific tests like cultures and sensitivity reports, it ensures that the right antibiotic is chosen for the specific bacteria causing the infection. This practice helps in targeting the infection more effectively, reducing the risk of antibiotic resistance.
B. Patients stop taking an antibiotic after they feel better:
This scenario is problematic. When patients start feeling better, they might assume the infection is completely gone and stop taking antibiotics before the prescribed course is finished. This premature discontinuation can leave some bacteria alive, which may develop resistance to the antibiotic used. This practice is a significant contributor to antibiotic resistance.
C. Antibiotics are taken with ascorbic acid (vitamin C):
Ascorbic acid (vitamin C) doesn't have a significant impact on antibiotic resistance. It is not a factor contributing to antibiotic resistance.
D. Antibiotics are taken with water or juice:
Whether antibiotics are taken with water or juice doesn’t directly influence antibiotic resistance. Proper hydration is essential to support the body's overall health, but it doesn't impact the development of antibiotic resistance.
Correct Answer is B
Explanation
A. Bactericidal and bacteriostatic are used interchangeably.
This statement is incorrect. Bactericidal and bacteriostatic have distinct meanings in pharmacology and microbiology. Bactericidal means the drug kills bacteria, whereas bacteriostatic means the drug inhibits the growth of bacteria without killing them.
B. Bactericidal drugs are directly lethal to bacteria, and bacteriostatic drugs work to slow bacterial growth but do not cause cell death.
This statement is correct. Bactericidal drugs directly kill bacteria, leading to their death. Bacteriostatic drugs inhibit the growth of bacteria without causing their immediate death. Both types of drugs play different roles in the treatment of bacterial infections.
C. Bacteriostatic drugs are directly lethal to bacteria, and bactericidal drugs work to slow bacterial growth but do not cause cell death.
This statement is incorrect. It confuses the roles of bactericidal and bacteriostatic drugs. Bactericidal drugs directly kill bacteria, while bacteriostatic drugs inhibit bacterial growth without immediate cell death.
D. A bactericidal drug can cause death to the host, whereas a bacteriostatic drug only affects bacteria.
This statement is incorrect. Both bactericidal and bacteriostatic drugs primarily affect bacteria, not the host. The difference lies in how they affect bacteria: bactericidal drugs kill bacteria directly, and bacteriostatic drugs inhibit their growth.
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