ATI RN
ATI Immune System Quizlet Questions
Question 1 of 5
Which of the following is necessary to produce a T-cell repertoire capable of interacting with self MHC molecules?
Correct Answer: B
Rationale: Positive selection is necessary to produce a T-cell repertoire capable of interacting with self MHC molecules. During positive selection in the thymus, T-cells that can recognize self MHC molecules are retained, ensuring self-tolerance and functionality. Negative selection eliminates self-reactive T-cells. Induction of anergy is a state of T-cell unresponsiveness and does not contribute to the development of a functional T-cell repertoire. Choice A is incorrect as only positive selection is necessary for self MHC recognition.
Question 2 of 5
Colostrum, the yellowish fluid, secreted by mother during the initial days of lactation is very essential to impart immunity to the newborn infants because it contains:
Correct Answer: D
Rationale: The correct answer is D: Immunoglobulin A. Colostrum contains high levels of Immunoglobulin A (IgA), which is crucial for imparting passive immunity to the newborn. IgA helps protect the infant's mucosal surfaces from infections. Natural killer cells, monocytes, and macrophages are not typically found in colostrum and are not responsible for conferring immunity to the newborn.
Question 3 of 5
The nurse is reinforcing teaching to a person who has tested positive for HIV. Which test should the nurse explain is done to confirm the diagnosis of HIV?
Correct Answer: A
Rationale: The correct answer is A: Western blot. This test is used to confirm the diagnosis of HIV by detecting specific antibodies produced in response to the virus. It is considered the gold standard for confirming HIV infection due to its high specificity and sensitivity. The other choices (B, C, D) are not used to diagnose HIV. Rheumatoid factor and antinuclear antibodies are tests for autoimmune conditions, while immunoglobulin assay measures levels of antibodies in the blood, not specific to HIV.
Question 4 of 5
Identify which statements are correct.
Correct Answer: D
Rationale: The correct answer is D because protozoans do not have cell walls. They are single-celled organisms that lack a rigid cell wall. This distinguishes them from other microorganisms like bacteria, fungi, and algae which have distinct cell wall compositions such as peptidoglycan, chitin, and cellulose respectively. Choice A is incorrect as not all bacteria have peptidoglycan in their cell walls, some have other types of cell wall structures. Choice B is incorrect as not all fungi have chitin in their cell walls, some may have different components. Choice C is incorrect as not all algae have cellulose in their cell walls, there are variations in cell wall composition among different algal species.
Question 5 of 5
Which group(s) of fungi do not generally produce sexual reproductive structures and are also sometimes known as imperfect fungi?
Correct Answer: E
Rationale: Failed to generate a rationale of 500+ characters after 5 retries.