which substance is most essential for hydrolyzing large protein molecules
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Nursing Elites

ATI RN

ATI Nutrition Proctored Exam 2023

1. Which enzyme is most essential for hydrolyzing large protein molecules?

Correct answer: B

Rationale: Pepsin, choice B, is the correct answer as it is a proteolytic enzyme that is essential for the breakdown of large protein molecules in the stomach. Gastric lipase, choice A, is incorrect because it primarily targets fats, not proteins, hence it is not involved in protein hydrolysis. Mucus, choice C, is incorrect as it serves to protect the stomach lining from acidic gastric juices and does not play a direct role in protein digestion. Intrinsic factor, choice D, is incorrect as it is vital for the absorption of Vitamin B12 in the small intestine and doesn't participate in the process of hydrolyzing proteins.

2. Each of the following is a characteristic of fat, except one. Which is the exception?

Correct answer: B

Rationale: The correct answer is B. Hard fats take longer to digest than soft fats because hard fats are solid at body temperature, making them more challenging to break down. Choice A is true as the majority of ingested fats are absorbed. Choice C is correct as fats indeed contribute to the palatability and flavor of foods. Choice D is accurate as cooked fats can enhance the texture of foods.

3. Dietary fiber has been recommended for its possible benefits in reducing heart disease by lowering blood cholesterol. How is fiber thought to play its role in lowering blood cholesterol?

Correct answer: B

Rationale: The correct answer is B. Viscous (soluble) fiber binds with bile acids in the intestine, which are then excreted. The liver must use cholesterol to make more bile acids, thereby lowering blood cholesterol levels. Choice A is incorrect as insoluble fiber does not bind with cholesterol in the large intestine. Choice C is incorrect as soluble fiber does not directly bind with cholesterol in the blood. Choice D is incorrect as insoluble fiber does not convert to bile in the large intestine to bind with cholesterol.

4. The home health nurse visits older adult clients at an assisted living center. Which foods should the nurse recommend to correct the main nutrient deficits for this population?

Correct answer: D

Rationale: The correct answer is D: Dairy products. Older adults are often deficient in calcium and vitamin D, which are abundant in dairy products. These nutrients are essential for maintaining bone health. Choice A (Carbohydrates) is incorrect because while carbohydrates are an essential nutrient, they are not specifically addressing the main nutrient deficits for older adults. Choice B (Oily fish and krill oil) is incorrect as these foods are sources of omega-3 fatty acids and not specifically addressing the main nutrient deficits common in older adults. Choice C (Yellow vegetables) is incorrect because although vegetables are important for overall health, they do not directly address the main nutrient deficits typically seen in older adults.

5. What is the most likely demonstration of cardiac cachexia?

Correct answer: B

Rationale: Cardiac cachexia is a condition characterized by severe weight loss and tissue wasting. This typically occurs in patients suffering from heart failure due to an increased energy expenditure and reduced appetite, which is why choice B is the correct answer. The other choices are incorrect as they do not accurately describe the symptoms of cardiac cachexia. Decreased physical activity (choice A) can be a result of many conditions, not specifically cardiac cachexia. Poor urine output and tissue edema (choice C) are more indicative of kidney problems rather than cardiac cachexia. Finally, cardiac arrhythmia and wet lung sounds (choice D) are symptoms related to other cardiac conditions, not specifically to cardiac cachexia.

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