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| Section | Objectives |
|---|---|
| Mathematics | - Word Problems
|
| Science | - Biology
|
| Verbal Skills | - Reading Comprehension
|
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NEW QUESTION # 90
Where does saltatory conduction occur?
Answer: D
Explanation:
Saltatory conduction is the rapid transmission of nerve impulses alongmyelinated axons. In myelinated neurons, the axon is covered with a fatty insulating layer called myelin, which is interrupted at gaps known as nodes of Ranvier. During saltatory conduction, the electrical impulse "jumps" from one node to the next, greatly increasing the speed of signal transmission. Unmyelinated axons conduct impulses more slowly because the signal must travel continuously along the entire membrane. Dendrites receive signals rather than transmit them over long distances, and muscle cells do not conduct nerve impulses in this manner. The NEX Science exam commonly tests nervous system physiology, particularly mechanisms that improve conduction speed, making myelinated axons the correct answer.
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NEW QUESTION # 91
Reading Comprehension
Passage:
Older adults may be at increased risk for falls due to decreased balance, vision changes, and muscle weakness.
Preventive measures such as exercise and home safety modifications can reduce fall risk.
What is the main purpose of the passage?
Answer: A
Explanation:
The passage discusses both causes of falls in older adults and strategies to prevent them. Option B accurately summarizes this purpose. The other options focus on details not emphasized. Purpose questions on the NEX often involve identifying both the problem and the proposed solution.
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NEW QUESTION # 92
Reading Comprehension
Passage:
Vaccinations work by stimulating the immune system to recognize and fight specific pathogens. Once vaccinated, the body can respond more quickly if exposed to the disease in the future, often preventing illness entirely.
Which statement best explains how vaccines protect the body?
Answer: B
Explanation:
The passage explains that vaccines stimulate the immune system so it can recognize pathogens and respond more quickly in the future. This means vaccines act as a training mechanism for the immune system. Option C correctly reflects this explanation. Option A is incorrect because vaccines do not eliminate all bacteria permanently. Option B is the opposite of what the passage states, as vaccines strengthen immune response.
Option D is incorrect because vaccines are preventive, not treatments administered after symptoms appear.
NEX reading comprehension questions often test understanding of scientific processes explained in simple language, and correct answers usually restate information using different wording rather than introducing new ideas.
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NEW QUESTION # 93
A nurse needs to administer 0.75 liters of IV fluid over 3 hours. What is the flow rate in milliliters per hour?
(1 liter = 1,000 milliliters)
Answer: C
Explanation:
This question tests unit conversion and rate calculation, both of which are essential skills on the NEX Math Section, especially for medication and IV flow problems. First, convert liters to milliliters because flow rates are typically expressed in milliliters per hour. Since 1 liter equals 1,000 milliliters, multiply 0.75 liters by
1,000 to get 750 milliliters. Next, determine the flow rate by dividing the total volume by the total time. The fluid is administered over 3 hours, so divide 750 milliliters by 3 hours. This calculation gives 250 milliliters per hour. Therefore, the correct answer is option C. Option A results from dividing incorrectly, option B reflects underestimation, and option D would be correct only if the volume were larger. NEX exam questions often focus on proper setup of unit conversions before performing calculations. Always convert units first, then divide by time to find a rate.
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NEW QUESTION # 94
An acid needs to be diluted at a ratio of 5 grams of acid per 3 liters of water. How many grams of acid are needed for a solution of 24 liters of water to maintain the ratio?
Answer: C
Explanation:
This is a ratio and proportion problem. The given ratio is 5 grams of acid for every 3 liters of water. First determine how many groups of 3 liters are in 24 liters: 24 ÷ 3 = 8. Each group requires 5 grams of acid, so multiply: 8 × 5 = 40 grams. Therefore, option C is correct. Option D results from dividing instead of multiplying. Option B is excessively large and unrealistic. Ratio problems on the NEX require identifying the scaling factor before multiplying.
NEW QUESTION # 95
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