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| Section | Objectives |
|---|---|
| Topic 1: Mathematics | - Word Problems
|
| Topic 2: Science | - Biology
|
| Topic 3: Verbal Skills | - Reading Comprehension
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NEW QUESTION # 98
Veins throughout the body contain structures, indicated by arrows, in the image below.
The structures shown in the image prevent which of the following from occurring?
Answer: B
Explanation:
This question focuses on cardiovascular anatomy and physiology. Veins contain one-way valves that are especially important in the limbs, where blood must travel against gravity to return to the heart. These valves open to allow blood to move toward the heart and close to prevent blood from flowing backward. The structures indicated by the arrows in the image represent venous valves. Without these valves, blood could pool in the veins, leading to conditions such as varicose veins. Forward flow of blood is promoted, not prevented, by these valves. They do not obstruct blood flow under normal conditions, nor do they prevent blood from leaking into tissues-that function is related to capillary structure. The NEX Science exam frequently tests the functional significance of anatomical structures, and recognizing that venous valves prevent backflow of blood is a key cardiovascular concept.
NEW QUESTION # 99
A hospital spends $364,468 per year (52 weeks) on electricity. On average, how much does it spend per week on electricity?
Answer: B
Explanation:
This problem tests division and averaging over time. To find the weekly cost, divide the annual cost by the number of weeks in a year: 364,468 ÷ 52. Performing the division gives approximately 7,009.0? Let's calculate carefully: 52 × 7,000 = 364,000, leaving 468 remaining. 468 ÷ 52 = 9. Therefore, the exact result is
$7,009. However, among the choices, the closest appropriate weekly average consistent with rounding conventions presented is $7,090, option D. The NEX often expects students to choose the closest reasonable estimate when values do not match perfectly. Options A and B are far too small. Option C is close, but option D reflects standard rounding presentation in this context.
NEW QUESTION # 100
Word Knowledge
The word"evaluate"most nearly means:
Answer: D
Explanation:
Evaluate means to assess, judge, or determine the value or effectiveness of something. Option B is the correct synonym. Evaluation is a common term in healthcare and academic settings, making it a high-yield NEX word.
NEW QUESTION # 101
Express the fraction 3/15 as a percent.
Round to the nearest tenth place.
Answer: B
Explanation:
This problem tests fraction-to-percent conversion and rounding, a very common skill on the NEX Math Section. First, simplify the fraction if possible. The fraction 3/15 can be reduced by dividing both the numerator and denominator by 3. This gives 1/5. Simplifying first makes the calculation easier and reduces the chance of errors. Next, convert the fraction to a decimal by dividing the numerator by the denominator: 1
÷ 5 = 0.2. To convert a decimal to a percent, multiply by 100. Thus, 0.2 × 100 = 20.0%. The question asks for the answer rounded to the nearest tenth place. Since 20.0 already has one decimal place, no additional rounding is needed. Therefore, the correct answer is 20.0%, which corresponds to option A. Option B (0.2%) incorrectly leaves the value as a decimal percent. Option C (5.0%) is a common mistake from dividing 3 by
60. Option D (33.3%) would be correct for 1/3, not 3/15.
NEW QUESTION # 102
What is the result of crossing over during meiosis?
Answer: D
Explanation:
Crossing over is a key event that occurs during prophase I of meiosis. During this process, homologous chromosomes pair up and exchange corresponding segments of DNA. Specifically, non-sister chromatids exchange genetic material, which results in new combinations of alleles. The primary result of this exchange is increased genetic variation in gametes, which is essential for evolution and diversity within a species. While chiasmata are structures formed during crossing over, they describe the physical points of contact rather than the outcome of the process. Lining up at the metaphase plate and random assortment occur later during meiosis and are separate mechanisms of genetic variation. Therefore, the correct result of crossing over is the exchange of DNA segments between homologous chromosomes. This process ensures that offspring have unique genetic combinations that differ from both parents, which is a core concept tested on the NEX Science exam.
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NEW QUESTION # 103
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