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| Section | Weight | Objectives |
|---|---|---|
| Verbal Ability | 34% | - Word Knowledge
|
| Science | 38% | - Biology
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| Mathematics | 28% | - Measurement
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NEW QUESTION # 126
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: B
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 # 127
What is the term for small, clear vessels found near blood capillaries and responsible for draining excess interstitial fluid not reabsorbed into the blood?
Answer: B
Explanation:
Lymphatic capillaries are small, thin-walled vessels that collect excess interstitial fluid that is not reabsorbed by blood capillaries. This fluid, now called lymph, is transported through the lymphatic system and eventually returned to the bloodstream. This process helps maintain fluid balance and prevents tissue swelling. Arterioles and venules are part of the blood vascular system, not the lymphatic system. Immune capillaries are not a recognized anatomical structure. The NEX Science exam often tests the relationship between the circulatory and lymphatic systems, emphasizing the role of lymphatic capillaries in fluid regulation and immune defense.
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NEW QUESTION # 128
Reading Comprehension
Passage:
Vaccination programs rely on widespread participation to be effective. When a large portion of the population is vaccinated, herd immunity helps protect individuals who cannot be vaccinated.
What is the primary benefit of herd immunity?
Answer: C
Explanation:
The passage explains that herd immunity occurs when a large percentage of the population is vaccinated, which helps protect those who cannot receive vaccines. Option B correctly states this benefit. The passage does not suggest that herd immunity eliminates all diseases or replaces hygiene practices. It also does not mention reducing side effects. On the NEX exam, cause-and-effect questions require identifying the specific outcome discussed rather than making broad assumptions. Herd immunity's protective effect on vulnerable individuals is the key idea.
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NEW QUESTION # 129
Which of the following will increase the amount of oxygen produced by a plant?
Answer: A
Explanation:
Oxygen is produced during the process of photosynthesis, which occurs in the chloroplasts of plant cells.
During photosynthesis, plants use carbon dioxide, water, and light energy to produce glucose and oxygen.
Carbon dioxide is one of the key raw materials required for this process. When the availability of carbon dioxide increases, the rate of photosynthesis can also increase, assuming that light and water are not limiting factors. As photosynthesis increases, more oxygen is released as a byproduct. Decreasing carbon dioxide would slow photosynthesis and reduce oxygen production. Glucose is a product of photosynthesis, not a reactant, so changing glucose levels does not directly increase oxygen output. Therefore, increasing available carbon dioxide is the correct answer. The NEX Science exam frequently tests understanding of the inputs and outputs of photosynthesis and how environmental factors affect the process.
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NEW QUESTION # 130
When an individual sustains a torn ligament, the connection between which two structures is disrupted?
Answer: A
Explanation:
Ligaments are strong bands of connective tissue that connect bone to bone at joints. Their primary function is to stabilize joints and prevent excessive movement. When a ligament is torn, the connection between two bones is disrupted, leading to joint instability. Tendons, not ligaments, connect muscle to bone. Nerves transmit electrical signals, and arteries transport blood. The NEX Science exam frequently includes musculoskeletal system questions that require distinguishing between ligaments and tendons, making bone-to- bone the correct answer.
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NEW QUESTION # 131
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