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| Section | Weight | Objectives |
|---|---|---|
| Science | 36.8% | - Biology
|
| Mathematics | 27.6% | - Measurement
|
| Verbal Ability | 35.6% | - Word Knowledge
|
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NEW QUESTION # 75
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: A
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 # 76
You are staining bacterial samples for identification and viewing them under a microscope.
Which bacterial shape do you observe in the sample?
Answer: C
Explanation:
This question tests knowledge of bacterial morphology, which is commonly assessed on the NEX Science exam. Bacteria are often classified based on their shape, which helps in identification and diagnosis. The image shows elongated, rod-shaped bacteria. This shape is characteristic ofbacilli. Bacilli are cylindrical or rod-like and are commonly found in many bacterial species, includingEscherichia coliandBacillus anthracis.
Cocci are spherical in shape, spirochetes are long and spiral-shaped, and vibrios have a curved, comma-like appearance. None of these shapes match the straight rod-like structures shown in the image. Identifying bacterial shape is an important first step in microbiology before further tests such as Gram staining or biochemical analysis are performed. The NEX exam frequently uses images or descriptions to assess whether students can correctly distinguish between cocci, bacilli, spirilla/spirochetes, and vibrios based on visual characteristics. Recognizing bacilli as rod-shaped bacteria is a key foundational concept.
NEW QUESTION # 77
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: C
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 # 78
Review the image of the human digestive tract shown below.
What is the principal process occurring in the region labeled 4?
Answer: B
Explanation:
Region 4 in the diagram corresponds to the large intestine. The primary function of the large intestine is the absorption of water and electrolytes from undigested food material. This process helps concentrate waste material into feces before elimination. Assimilation of fatty acids and synthesis of triglycerides occur primarily in the small intestine, especially within intestinal epithelial cells. Hydrolysis of proteins occurs mainly in the stomach and small intestine through the action of enzymes such as pepsin and proteases. The NEX Science exam often tests digestive system function by matching specific organs to their primary processes. Since water absorption is the defining function of the large intestine, option B is correct.
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NEW QUESTION # 79
Word Knowledge
The word"frequent"most nearly means:
Answer: B
Explanation:
"Frequent" means occurring often or regularly. Option B is correct. Recognizing time- and frequency-related words is common on the NEX exam.
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NEW QUESTION # 80
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