Nokea
What is a causative factor of Hirschsprung disease?
- A. Frequent evacuation of solids, liquids, and gases
- B. Excessive peristaltic movement
- C. Absence of parasympathetic ganglion cells in a portion of the colon
- D. One portion of the bowel telescoping into another
Correct Answer: C
Rationale: The correct answer is C: Absence of parasympathetic ganglion cells in a portion of the colon. Hirschsprung disease is a congenital condition characterized by the absence of nerve cells (ganglia) in parts of the colon. This absence leads to a lack of peristalsis in the affected segment, resulting in severe constipation and bowel obstruction. Choices A, B, and D are incorrect. Choice A describes symptoms of diarrhea rather than a causative factor of Hirschsprung disease. Excessive peristaltic movement (choice B) is not a causative factor but rather the opposite, as Hirschsprung disease is associated with reduced peristalsis. Choice D, which refers to intussusception, is a different condition unrelated to Hirschsprung disease.
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Why is peer review important in scientific research?
- A. To expedite publication of results.
- B. To facilitate the replication of studies.
- C. To verify the accuracy and validity of research findings.
- D. To enhance the credibility of the research.
Correct Answer: C
Rationale: Peer review is crucial in scientific research to verify the accuracy and validity of research findings. By subjecting research papers to evaluation by experts in the field, peer review ensures that the study's methods, results, and conclusions are robust and reliable. This process helps to maintain high standards of quality in scientific publications, providing credibility to the research. Choices A and D are incorrect because the primary purpose of peer review is not to expedite publication or solely enhance credibility; its core function is to validate the research's accuracy and validity. Choice B, while beneficial, is not the primary reason for peer review; replication is a byproduct of the rigorous evaluation of research methods and findings.
In the scientific method, a tentative solution to a problem is called a what?
- A. theory
- B. prediction
- C. hypothesis
- D. correlation
Correct Answer: C
Rationale: In the scientific method, a hypothesis is a tentative solution or educated guess that is tested through research. A theory (choice A) is a well-substantiated explanation based on evidence and extensive testing. A prediction (choice B) is a statement about what will happen in the future based on existing knowledge. Correlation (choice D) refers to a mutual relationship between two or more things, indicating how they may change together but not providing a solution to a problem.
How should a healthcare professional handle a child with a new diagnosis of ADHD?
- A. Provide behavioral therapy and support
- B. Increase sugar intake
- C. Restrict all forms of exercise
- D. Avoid medication use
Correct Answer: A
Rationale: When dealing with a child newly diagnosed with ADHD, providing behavioral therapy and support is crucial. This approach helps the child learn coping strategies, improve social skills, and manage their symptoms effectively. Choice B, increasing sugar intake, is incorrect as there is no evidence linking sugar consumption to ADHD. Choice C, restricting all forms of exercise, is inappropriate as regular physical activity can actually benefit children with ADHD by helping them release excess energy and improve focus. Choice D, avoiding medication use, may not be the best course of action as medication prescribed by a healthcare professional can sometimes be beneficial in managing ADHD symptoms when combined with other therapies.
Gram for gram, which class of nutrient provides the most energy?
- A. fats
- B. alcohols
- C. proteins
- D. carbohydrates
Correct Answer: A
Rationale: The correct answer is fats. Fats provide 9 kilocalories per gram, which is more energy-dense compared to proteins and carbohydrates. While proteins and carbohydrates provide 4 kilocalories per gram, fats provide more than twice the energy, making them the most energy-providing nutrient. Alcohols are not considered essential nutrients and do not provide energy for the body, unlike fats, proteins, and carbohydrates. Therefore, fats are the correct answer for the most energy-providing nutrient.
What is the term for the amount of heat required to raise the temperature of one kilogram of water by one degree Celsius?
- A. Calorie
- B. Joule
- C. Kilojoule
- D. Kilocalorie
Correct Answer: D
Rationale: The correct answer is D, Kilocalorie. The term kilocalorie, often referred to as a calorie, is the amount of heat required to raise the temperature of one kilogram of water by one degree Celsius. While Choice A, Calorie, is technically correct, it is not the most specific term for the described amount of heat. Choice B, Joule, is a unit of energy but not specifically related to the amount of heat required to raise the temperature of water. Choice C, Kilojoule, is also a unit of energy but not the precise term for the heat required to raise the temperature of water by one degree Celsius.