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| Section | Objectives |
|---|---|
| Verbal Skills | - Language Usage
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| Mathematics | - Word Problems
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| Science | - Basic Chemistry
|
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NEW QUESTION # 32
Which of these responses is an example of a simple negative feedback response in the body?
Answer: A
Explanation:
Negative feedback occurs when a change in a physiological variable triggers a response that counteracts the initial change, helping maintain homeostasis. When blood glucose levels rise, the pancreas releases insulin, which promotes glucose uptake by cells and lowers blood glucose back to normal levels. This is a classic example of negative feedback. Option B is incorrect because thyroxine increases metabolism, not decreases it.
Options A and D do not clearly demonstrate a direct feedback loop restoring balance. The NEX Science exam often highlights glucose regulation as a key example of negative feedback because it clearly illustrates cause- and-effect relationships within endocrine control systems.
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NEW QUESTION # 33
According to the Centers for Disease Control and Prevention (CDC), approximately 7% of children and adolescents ages 6 to 19 in the United States have a high total cholesterol. If 120,000 children and adolescents in that age range were sampled, approximately how many of them would have a normal total cholesterol?
Answer: C
Explanation:
This is a percentage complement problem. If 7% of children have high cholesterol, then the remaining percentage with normal cholesterol is 100% # 7% = 93%. Convert 93% to a decimal by moving the decimal point two places to the left: 0.93. Multiply this decimal by the total number of children sampled: 0.93 ×
120,000 = 111,600. Therefore, approximately 111,600 children would have normal cholesterol levels, making option D correct. Option A incorrectly calculates 7% instead of the complement. Option C represents 70%, not 93%. Option B is close but incorrect due to rounding. NEX math questions often assess whether students understand that "normal" refers to the remainder after subtracting the affected group.
NEW QUESTION # 34
Milk, pure water, lemon juice, and gastric juice were tested using a pH meter. Results are summarized in the chart below.
Substance | pH
Milk | 6.8
Pure water | 7
Lemon juice | 2
Gastric juice | 1
Which substance is the most acidic?
Answer: D
Explanation:
The pH scale measures acidity and alkalinity, ranging from 0 to 14. Lower pH values indicate higher acidity, while higher pH values indicate greater alkalinity. A pH of 7 is considered neutral. In the chart provided, gastric juice has a pH of 1, which is the lowest value listed, making it the most acidic substance. Lemon juice, with a pH of 2, is also acidic but less so than gastric juice. Milk is slightly acidic, and pure water is neutral.
Gastric juice contains hydrochloric acid, which aids digestion and destroys harmful microorganisms in the stomach. The NEX Science exam frequently tests understanding of the pH scale and its physiological relevance, particularly in digestive processes.
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NEW QUESTION # 35
Reading Comprehension
Passage:
Sleep deprivation can impair immune function, making individuals more susceptible to illness. Over time, chronic lack of sleep may increase the risk of serious health conditions.
Which statement is best supported by the passage?
Answer: A
Explanation:
The passage states that lack of sleep weakens immune function and increases susceptibility to illness. This supports the conclusion that adequate sleep supports immune health. Option C accurately reflects this relationship. Options A and D contradict the passage, while option B exaggerates the effect. NEX questions often test the ability to infer logical conclusions without overgeneralizing.
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NEW QUESTION # 36
A student is traveling out of the United States to visit family living in Europe. The room booked for the trip costs €120.00 per night.
Given that $1.00 (US dollar) is equal to €1.2, how much will it cost per night in US Dollars?
Answer: A
Explanation:
This problem involves currency conversion. The exchange rate states that $1 equals €1.2. To convert euros to dollars, divide the euro amount by 1.2. Set up the calculation: €120 ÷ 1.2 = $100. Therefore, the cost per night in US dollars is $100. Option C is correct. Option B incorrectly multiplies instead of dividing. Options A and D fail to account for the exchange rate. NEX math problems involving currency emphasize understanding the direction of conversion and selecting the correct operation.
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NEW QUESTION # 37
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