you have been asked to help a top nutrition researcher conduct human experiments on vitamin c as the subjects walk into the laboratory you distribute

HESI LPN

HESI PN Nutrition Practice Exam

1. You have been asked to help a top nutrition researcher conduct human experiments on vitamin C. As the subjects walk into the laboratory, you distribute all the vitamin C pill bottles to the girls and all the placebo pill bottles to the boys. What should you have done?

A. Giving all the boys the vitamin C and the girls the placebo, and telling them what they were getting.
B. Distributing the bottles randomly, randomizing the subjects, and telling them what they were getting.
C. Telling the subjects which group they were in, but preventing yourself from knowing the contents of the pill bottles.
D. Preventing yourself from knowing what is in the pill bottles, and distributing the bottles randomly to the subjects.

Correct answer: D

Rationale: The correct approach in a scientific experiment is to prevent yourself from knowing the contents of the pill bottles and distribute them randomly to the subjects. This randomization helps to avoid bias and ensures that the results are not influenced by preconceived notions. Option A is incorrect because it introduces gender bias by assigning pills based on gender. Option B is incorrect as it mentions telling the subjects what they are getting, which could lead to placebo effects. Option C is incorrect as it suggests disclosing group information to the subjects, which can also introduce bias.

2. What is one benefit of using controls in an experiment?

A. The size of the groups does not matter.
B. The subjects are unaware of the experiment's details.
C. The subjects who are treated are balanced against the placebos.
D. The subjects are similar in all respects except for the treatment being tested.

Correct answer: D

Rationale: The correct answer is D. Controls in an experiment ensure that the subjects are similar in all respects except for the treatment being tested. This allows for a fair comparison between the treatment group and the control group. Choice A is incorrect because the size of the groups is not the primary benefit of using controls. Choice B is incorrect as blinding, not controls, refers to subjects not knowing about the experiment. Choice C is incorrect as it pertains more to randomization than the use of controls.

3. What is a key aspect of managing a child with eczema?

A. Daily baths with soap
B. Regular use of emollients and moisturizers
C. High-protein diet
D. Frequent exposure to sunlight

Correct answer: B

Rationale: Regular use of emollients and moisturizers is a key aspect of managing eczema in children. Emollients help maintain skin hydration and reduce irritation, which are crucial in managing eczema symptoms. Daily baths with soap can actually worsen eczema by drying out the skin further. A high-protein diet and frequent exposure to sunlight are not directly related to managing eczema and may not have a significant impact on the condition.

4. How should a healthcare provider assist in the management of a child with type 1 diabetes?

A. Provide high-carbohydrate snacks
B. Schedule frequent blood glucose tests
C. Increase dietary fat intake
D. Encourage a high-protein diet

Correct answer: B

Rationale: For the management of type 1 diabetes in a child, scheduling frequent blood glucose tests is essential. These tests help in monitoring blood sugar levels, adjusting insulin doses, and ensuring proper glucose control. Choices A, C, and D are incorrect. Providing high-carbohydrate snacks can lead to blood sugar spikes, increasing dietary fat intake is not recommended, and encouraging a high-protein diet is not a standard recommendation for managing type 1 diabetes in children.

5. How much energy is required to raise the temperature of one kilogram of water by 1°C?

A. 10 calories
B. 100 calories
C. 1 kilocalorie
D. 10 kilocalories

Correct answer: C

Rationale: The correct answer is 1 kilocalorie. This is the amount of energy required to raise the temperature of 1 kilogram of water by 1°C. Choice A (10 calories) and Choice D (10 kilocalories) are incorrect as they do not represent the correct unit of measurement for this specific scenario. Choice B (100 calories) is also incorrect as it overestimates the amount of energy required. The specific heat capacity of water is approximately 1 calorie/gram °C, which means that 1 kilogram (1000 grams) of water requires 1 kilocalorie (1000 calories) to raise its temperature by 1°C.