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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Science | 36.8% | - Biology
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| Topic 2: Verbal Ability | 35.6% | - Reading Comprehension
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| Topic 3: Mathematics | 27.6% | - Algebra
|
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NEW QUESTION # 89
A scientist removes the pancreas from laboratory rats. In a few days, what would most likely be observed?
Answer: A
Explanation:
The pancreas produces insulin, which regulates blood glucose levels. Without insulin, glucose cannot efficiently enter cells, leading to hyperglycemia. Removing the pancreas would therefore cause blood glucose levels to rise. This concept is directly related to diabetes physiology and is a common topic on the NEX Science exam.
NEW QUESTION # 90
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 # 91
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 # 92
Which of the following pictures reflects the effect on red blood cells when plain water is infused into a person?
Answer: B
Explanation:
This question tests understanding of osmosis and tonicity, which are frequently assessed on the NEX Science exam, especially in physiology-related contexts. Plain water ishypotoniccompared to the fluid inside red blood cells. When red blood cells are placed in a hypotonic solution, water movesintothe cells by osmosis because water flows from an area of lower solute concentration to higher solute concentration. As water enters the red blood cells, they swell. If too much water enters, the cells can burst in a process calledhemolysis
. The correct image therefore shows enlarged, rounded red blood cells that may appear ruptured. Normal biconcave cells indicate an isotonic environment, while shriveled or spiky cells occur in a hypertonic solution.
Sickle-shaped cells are related to a genetic disorder and are not caused by osmotic changes. The NEX exam often emphasizes patient safety concepts, including why plain water should never be infused intravenously.
NEW QUESTION # 93
What stimulates gustatory (taste) cells?
Answer: B
Explanation:
Gustatory cells are sensory receptors responsible for taste and are located primarily in taste buds on the tongue. These cells are stimulated by chemical substances that are dissolved in saliva. When food dissolves in saliva, the dissolved molecules bind to receptors on gustatory cells, triggering nerve impulses that are interpreted by the brain as taste. Movement of otoliths is related to balance in the inner ear, deep pressure changes stimulate mechanoreceptors, and photons of light stimulate photoreceptors in the eye. The NEX Science exam frequently tests sensory physiology by asking students to match receptors with the correct type of stimulus. Recognizing that taste is a chemical sense dependent on substances in solution is fundamental.
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NEW QUESTION # 94
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