One similarity between cell receptors and antibodies is that both

Correct Answer: B

Rationale: The correct answer is B: Both cell receptors and antibodies are highly specific in their actions. Cell receptors recognize and bind to specific molecules, triggering cellular responses. Antibodies are produced by the immune system to specifically target and neutralize foreign pathogens. This specificity is crucial for their functions. A, C, and D are incorrect: A: Cell receptors and antibodies are not produced by nerve cells. Cell receptors are typically found on the surface of various cell types, while antibodies are produced by B cells in the immune system. C: Cell receptors and antibodies do not slow the rates of chemical reactions. Their primary function is not to catalyze or inhibit chemical reactions. D: Cell receptors and antibodies are not directly involved in digestion. Digestion primarily involves enzymes and other digestive processes within the gastrointestinal tract.

Correct Answer: B

Rationale: The correct answer is B because early manifestations of AIDS include persistent fever, swollen glands, diarrhea, weight loss, and fatigue due to the immune system being compromised by HIV. Choice A is incorrect because HIV leads to a decreased, not elevated, white blood cell count. Choice C is incorrect as energy levels typically decline with AIDS progression. Choice D is incorrect as dry and scaly skin is not a common early symptom of AIDS.

Correct Answer: B

Rationale: The correct answer is B: Reddish-purple skin lesions. Kaposi's sarcoma is a type of cancer that is commonly seen in individuals with HIV/AIDS. The skin lesions associated with Kaposi's sarcoma are typically reddish-purple in color and can present as flat, raised, or nodular lesions. These lesions are caused by abnormal growth of blood vessels and can be found on the skin, mouth, or internal organs. Treatment options include radiation therapy, chemotherapy, or antiretroviral therapy. Choice A is incorrect because the onset of progressive dementia is more characteristic of the AIDS-dementia complex, which can occur as HIV affects the nervous system. Choice C, yellowing of the skin, is not a typical finding of Kaposi's sarcoma. Choice D, persistent cough, is not a direct symptom of Kaposi's sarcoma and is more commonly associated with respiratory conditions or infections.

Correct Answer: A

Rationale: The correct answer is A because asking about the patient's immunization history helps assess their immunity against diseases and determine the need for further immunizations, ensuring they are protected from preventable illnesses. This is crucial for providing appropriate care and preventive measures. Choice B is incorrect as assessing dietary habits and nutrient deficiencies is not directly related to immunization history. Choice C is incorrect as genetic predispositions to autoimmune diseases are not typically identified through immunization history. Choice D is incorrect as compliance for preventive care can be determined through other means and is not the primary purpose of asking about immunization history.

Correct Answer: B

Rationale: The most important test for iron stores is serum ferritin. Ferritin is a protein that stores iron in the body, and its levels directly reflect the amount of iron stored. Therefore, measuring serum ferritin provides the most accurate assessment of iron stores. Serum calcium (choice A) is not a reliable indicator of iron stores. Serum iron (choice C) can fluctuate based on various factors and does not provide a comprehensive picture of iron stores. Choosing "None of the above" (choice D) would be incorrect as serum ferritin is indeed the most important test for iron stores.