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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Mathematics | 28% | - Measurement
|
| Topic 2: Science | 38% | - Health
|
| Topic 3: Verbal Ability | 34% | - Word Knowledge
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NEW QUESTION # 81
Which microorganism is considered harmful or causes disease?
Answer: D
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 # 82
Review the image below.
Which is the best piece of evidence that the blue whale evolved from a mammal that once lived on land?
Answer: C
Explanation:
Vestigial structures are anatomical features that are reduced in size and function compared to their ancestral form. In whales, vestigial leg bones are remnants of hind limbs that were fully functional in land-dwelling ancestors. These bones no longer serve a locomotor purpose but provide strong evolutionary evidence of descent from terrestrial mammals. The spinal column, rib cage, and jawbones are found in many vertebrates and do not specifically indicate a land-based ancestry. Vestigial leg bones, however, directly point to a time when whales had legs and lived on land before adapting to an aquatic environment. The NEX Science exam frequently tests evolutionary evidence, especially the significance of vestigial structures as proof of common ancestry and evolutionary change over time.
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NEW QUESTION # 83
Which of the following structures is found only in bacterial cells, not in plant or animal cells?
Answer: A
Explanation:
Bacterial cells are classified as prokaryotic cells, meaning they lack a membrane-bound nucleus. Instead of a nucleus, bacteria contain their genetic material in a region called the nucleoid. The nucleoid is not surrounded by a membrane and is unique to prokaryotic cells. In contrast, plant and animal cells are eukaryotic and store their DNA inside a true nucleus. Cell membranes, ribosomes, and DNA are found in all living cells, including bacteria, plants, and animals. Ribosomes in bacteria are smaller than those in eukaryotic cells, but they serve the same function of protein synthesis. Because the nucleoid region is exclusive to bacteria and other prokaryotes, option C is the correct answer. The NEX Science section frequently tests differences between prokaryotic and eukaryotic cells, making this an important concept to master.
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NEW QUESTION # 84
What is the correct order of blood flow through the cardiovascular system?
Answer: A
Explanation:
Blood flows in a continuous loop through the cardiovascular system. It is pumped from the heart into arteries, which carry oxygenated blood away from the heart. Arteries branch into smaller vessels that lead to capillaries, where gas and nutrient exchange occurs. Blood then flows into veins, which return deoxygenated blood back to the heart. The other options list structures in an incorrect order. Understanding blood flow pathways is a fundamental concept on the NEX Science exam and is essential for interpreting cardiovascular function and disorders.
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NEW QUESTION # 85
A nurse needs to administer 0.75 liters of IV fluid over 3 hours. What is the flow rate in milliliters per hour?
(1 liter = 1,000 milliliters)
Answer: C
Explanation:
This question tests unit conversion and rate calculation, both of which are essential skills on the NEX Math Section, especially for medication and IV flow problems. First, convert liters to milliliters because flow rates are typically expressed in milliliters per hour. Since 1 liter equals 1,000 milliliters, multiply 0.75 liters by
1,000 to get 750 milliliters. Next, determine the flow rate by dividing the total volume by the total time. The fluid is administered over 3 hours, so divide 750 milliliters by 3 hours. This calculation gives 250 milliliters per hour. Therefore, the correct answer is option C. Option A results from dividing incorrectly, option B reflects underestimation, and option D would be correct only if the volume were larger. NEX exam questions often focus on proper setup of unit conversions before performing calculations. Always convert units first, then divide by time to find a rate.
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NEW QUESTION # 86
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