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| Section | Objectives |
|---|---|
| Verbal Skills | - Language Usage
|
| Science | - Basic Chemistry
|
| Mathematics | - Basic Arithmetic
|
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NEW QUESTION # 56
Which microorganism is considered harmful or causes disease?
Answer: C
Explanation:
A pathogen is any microorganism that causes disease in a host. Pathogens include bacteria, viruses, fungi, and parasites. Enzymes are proteins that speed up chemical reactions and are not microorganisms. Immune factors are components of the immune system that protect against disease. A vector is an organism, such as a mosquito or tick, that transmits pathogens but does not itself cause disease. The NEX Science exam commonly assesses understanding of infectious disease terminology and distinctions between disease-causing organisms and disease carriers. Recognizing pathogens as the direct cause of illness is a key concept in microbiology and public health.
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NEW QUESTION # 57
Word Knowledge
The word"accurate"most nearly means:
Answer: A
Explanation:
"Accurate" means correct or free from error. Option B is the best synonym. The other options describe inaccuracy or uncertainty. Accuracy is a high-frequency NEX vocabulary word, especially in healthcare contexts.
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NEW QUESTION # 58
Which of the following pictures reflects the effect on red blood cells when plain water is infused into a person?
Answer: C
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 # 59
In order to neutralize a solution of HCl, one could add
Answer: C
Explanation:
Hydrochloric acid (HCl) is a strong acid. To neutralize an acid, a base must be added. Sodium hydroxide (NaOH) is a strong base that reacts with HCl to form water and a salt (sodium chloride). This neutralization reaction reduces the acidity of the solution. The other options-HNO#, CH#COOH, and H#SO#-are all acids and would increase acidity rather than neutralize it. The NEX Science exam often tests acid-base chemistry and emphasizes recognizing common acids and bases. Since NaOH is the only base listed, option C is correct.
NEW QUESTION # 60
Reading Comprehension
Passage:
Vaccinations work by stimulating the immune system to recognize and fight specific pathogens. Once vaccinated, the body can respond more quickly if exposed to the disease in the future, often preventing illness entirely.
Which statement best explains how vaccines protect the body?
Answer: C
Explanation:
The passage explains that vaccines stimulate the immune system so it can recognize pathogens and respond more quickly in the future. This means vaccines act as a training mechanism for the immune system. Option C correctly reflects this explanation. Option A is incorrect because vaccines do not eliminate all bacteria permanently. Option B is the opposite of what the passage states, as vaccines strengthen immune response.
Option D is incorrect because vaccines are preventive, not treatments administered after symptoms appear.
NEX reading comprehension questions often test understanding of scientific processes explained in simple language, and correct answers usually restate information using different wording rather than introducing new ideas.
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NEW QUESTION # 61
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