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| Section | Weight | Objectives |
|---|---|---|
| Mathematics | 28% | - Algebra
|
| Science | 38% | - Human Anatomy & Physiology
|
| Verbal Ability | 34% | - Word Knowledge
|
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NEW QUESTION # 72
Where does saltatory conduction occur?
Answer: C
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 # 73
The diagram below shows the rough endoplasmic reticulum of a cell as seen under the electron microscope.
The structures labeled Z are the site of protein synthesis.
Z is indicating
Answer: D
Explanation:
This question focuses on cell structure and function. The rough endoplasmic reticulum (RER) is characterized by the presence of small, dark granules attached to its surface. These granules are ribosomes. Ribosomes are the cellular structures responsible for protein synthesis, as they translate messenger RNA into amino acid chains. The presence of ribosomes gives the rough endoplasmic reticulum its "rough" appearance under an electron microscope. Mitochondria are involved in energy production, centrosomes play a role in cell division, and chromosomes contain genetic material within the nucleus. None of these structures are responsible for protein synthesis on the surface of the RER. The NEX Science exam frequently includes diagrams requiring students to identify organelles and link them to their functions. Recognizing ribosomes as the site of protein synthesis is a fundamental concept in cell biology.
NEW QUESTION # 74
A financial counselor is reviewing the annual tax refunds received by a group of clients. The refunds are shown below:
$500, $857, $1,500, $500, $6,753, $2,500, $3,000
What is the median tax refund?
Answer: B
Explanation:
This question assesses understanding of the median, which is the middle value when data are ordered from least to greatest. First, list the refunds in ascending order:
$500, $500, $857, $1,500, $2,500, $3,000, $6,753.
There are seven values total, so the median is the fourth value in the ordered list. The fourth value is $1,500.
Therefore, option D is correct. Option B represents the mode (most frequent value), not the median. Options A and C are averages or midpoints that do not correspond to the true median position. On the NEX exam, students are frequently tested on distinguishing mean, median, and mode, so remembering that the median is strictly positional-not calculated-is essential.
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NEW QUESTION # 75
You are designing a new community public health program to reduce the incidence of cardiovascular diseases (CVD) in your county.
Which of the following programs would likely result in the best overall outcome?
Answer: A
Explanation:
Combining disease prevention and health promotion provides the greatest overall impact on reducing cardiovascular disease. Prevention identifies and manages risk factors early, while health promotion encourages long-term lifestyle changes such as healthy eating, exercise, and stress reduction. Education alone increases awareness but may not change behavior. Screening without lifestyle intervention has limited long- term effectiveness. The NEX Science exam emphasizes population health strategies, making integrated prevention and promotion the most effective approach.
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NEW QUESTION # 76
Word Knowledge
The word"assist"most nearly means:
Answer: B
Explanation:
"Assist" means to help or support. Option B is the correct synonym. The remaining options describe actions that oppose assistance. NEX verbal questions frequently use healthcare-related vocabulary like assist, administer, and support.
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NEW QUESTION # 77
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