NEX Questions and Answers

The alarm stage is the initial reaction to a stressor and is characterized by emotional outbursts, increased heart rate, and release of stress hormones such as adrenaline. The employee’s immediate anger and physical reaction reflect this stage. The resistance stage involves adaptation, and exhaustion occurs after prolonged stress. “Failure” is not a recognized stage of the stress response. The NEX Science exam frequently tests physiological and psychological responses to stress, making alarm the correct answer.

Dominant traits are more likely to be expressed when present. If one parent contributes more dominant alleles, the child may resemble that parent more closely. Dominance does not mean stronger genes, just that they mask recessive traits. The NEX Science exam emphasizes basic Mendelian inheritance and dominance relationships.

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Healthcare inequity occurs when certain groups receive fewer resources or lower-quality care than others. Filtering water for only one segment of a community creates unequal access to a basic health necessity, increasing health risks for those excluded. The other options promote fairness and equal access to care. The NEX Science exam often evaluates understanding of social determinants of health and ethical principles, making option C the clearest example of inequity.

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Hyperextension refers to movement at a joint that goes beyond the normal anatomical position in the sagittal plane, specifically in a posterior direction. For example, bending the head backward farther than upright posture is considered hyperextension. Option B correctly describes this movement. Option A describes abduction, which occurs in the frontal plane. Option C describes flexion, which is anterior movement. Option D describes extension back to anatomical position, not beyond it. The NEX Science exam frequently tests anatomical terminology related to joint movement, and understanding directional planes (sagittal, frontal, transverse) is essential. Hyperextension differs from extension because it exceeds the normal range of motion, which can increase injury risk.

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Rods and cones are specialized photoreceptor cells responsible for vision. These cells are located in the retina, the innermost layer of the eye. The retina contains multiple layers of cells that convert light energy into electrical impulses, which are then transmitted to the brain through the optic nerve. Rods are highly sensitive to light and are essential for vision in dim conditions, while cones are responsible for color vision and sharp visual detail. The cornea and lens help focus light but do not detect it. The optic nerve transmits signals but does not contain photoreceptors. The NEX Science exam frequently tests eye anatomy and sensory physiology, especially the relationship between structure and function. Correctly identifying the retina as the location of rods and cones is essential for understanding how visual perception occurs.

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Electrolytes are charged ions that help regulate nerve function, muscle contraction, and fluid balance in the body. Calcium ions (Ca²⁺) are an important electrolyte found in the blood and play a crucial role in muscle contraction, blood clotting, and nerve signaling. Water is not an electrolyte because it does not carry a charge. Iodine is a trace element but not a primary blood electrolyte. Lactase is an enzyme involved in digestion, not an electrolyte. The NEX Science section often includes questions related to human physiology and emphasizes understanding ions and their roles in body function.

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Copper is a chemical element, meaning it consists of only one type of atom. If a penny were made entirely of copper, it would be classified as a pure substance and specifically as an element. Compounds consist of two or more different elements chemically bonded together. Mixtures contain substances physically combined, not chemically bonded. Since the penny is composed of only copper atoms, it does not qualify as a mixture or a compound. The NEX Science exam frequently includes questions on classification of matter, requiring students to distinguish between elements, compounds, and mixtures. Therefore, option D is correct.

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Crossing over is a key event that occurs during prophase I of meiosis. During this process, homologous chromosomes pair up and exchange corresponding segments of DNA. Specifically, non-sister chromatids exchange genetic material, which results in new combinations of alleles. The primary result of this exchange is increased genetic variation in gametes, which is essential for evolution and diversity within a species. While chiasmata are structures formed during crossing over, they describe the physical points of contact rather than the outcome of the process. Lining up at the metaphase plate and random assortment occur later during meiosis and are separate mechanisms of genetic variation. Therefore, the correct result of crossing over is the exchange of DNA segments between homologous chromosomes. This process ensures that offspring have unique genetic combinations that differ from both parents, which is a core concept tested on the NEX Science exam.

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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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Veins contain one-way valves that prevent blood from flowing backward as it returns to the heart. These valves are especially important in veins of the arms and legs, where blood must move against gravity. When muscles contract, they push blood forward toward the heart, and the valves close behind it to prevent backflow. Without these valves, blood could pool in the veins, leading to conditions such as varicose veins. The valves do not obstruct blood flow under normal conditions, nor do they prevent blood from leaking into surrounding tissues—that function is related to capillary walls. The NEX Science exam often emphasizes understanding how anatomical structures support physiological function, making venous valves a key cardiovascular concept.

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Diarrheal infections are most often spread through the fecal-oral route, commonly due to contaminated hands, food, or water. Washing hands with soap and water is the most effective method for preventing transmission. Antibacterial solutions and patient isolation also reduce spread. Wearing a mask is effective for preventing respiratory infections but offers little protection against diarrheal diseases. The NEX Science exam emphasizes appropriate infection-control strategies based on the mode of transmission, making mask use the least effective option in this scenario.

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This question requires interpreting data from a table, a common skill tested on the NEX Science exam. Looking specifically at the column for toddlers, the amino acid with the highest listed requirement (measured in milligrams per kilogram of body mass per day) is leucine. Although lysine, valine, and phenylalanine with tyrosine are also required in significant amounts, leucine has the highest numerical value for toddlers. Leucine is an essential amino acid that plays a critical role in growth, tissue repair, and muscle protein synthesis, which are especially important during early childhood when rapid growth occurs. Because toddlers are in a phase of accelerated development, higher amounts of certain amino acids are required compared to adults. The key to answering this question correctly is careful comparison of the numerical values within the toddler column, not overall trends across all age groups.

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Water is a polar molecule because it has an unequal distribution of electrical charge, with a slightly negative oxygen atom and slightly positive hydrogen atoms. This polarity causes water molecules to attract one another through hydrogen bonding. Option C demonstrates this property because water molecules stick together (cohesion) and do not mix with nonpolar substances like oil. Oil molecules lack polarity and cannot form hydrogen bonds with water, so the two substances separate into layers. The other options describe physical movement, gravity, or resistance, none of which are direct results of polarity. The NEX Science exam frequently tests molecular properties such as polarity by connecting them to real-world examples like oil and water separation. Recognizing hydrogen bonding and cohesion as outcomes of water’s polarity is essential for answering these questions correctly.

The passage emphasizes that preventive screenings allow health problems to be identified before symptoms appear. Option C accurately reflects this benefit. The other options are either incorrect or exaggerated. On the NEX exam, benefit questions often focus on early intervention and prevention themes.

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The passage discusses several strategies that help improve time management, including creating schedules, prioritizing tasks, and setting realistic goals. Option B directly reflects one of these strategies. The other options contradict or ignore the recommendations in the passage. Avoiding deadlines and working without schedules would worsen time management, and studying without breaks is not mentioned. On the NEX exam, reading comprehension questions often focus on identifying practical strategies or recommendations explicitly stated in the passage. Selecting prioritizing tasks demonstrates accurate understanding of the author’s suggestions.

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“Initial” refers to the first stage or beginning of something. Option B best matches this definition. NEX questions frequently test sequencing vocabulary.

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“Beneficial” describes something that produces a positive effect or advantage. “Helpful” is the closest synonym. The other options do not match the meaning. NEX vocabulary questions often test commonly used healthcare-related words.

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The passage clearly states that reducing smoking rates lowers the incidence of heart disease, lung cancer, and stroke. These are chronic diseases, making option C the correct answer. The other options are either not mentioned or incorrect. On the NEX exam, cause-and-effect reading questions require identifying outcomes that are directly linked to actions described in the passage. Choosing the most clearly stated effect is essential.

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The passage explains what antibiotics treat, what they do not treat, and the consequences of misuse. Its purpose is informational, focusing on responsible use to prevent resistance. Option C best captures this purpose. The other options either misrepresent or ignore the main focus. Purpose questions on the NEX often test whether the reader understandswhythe passage was written.

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Restrict means to limit or control. Option C is the correct synonym. This word commonly appears in medical and safety contexts.

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Minimize means to reduce something to the smallest amount possible. Option C is the correct synonym. Understanding reduction-related vocabulary is important for NEX verbal success.

The passage states that regular exercise strengthens the heart muscle and increases endurance. Option B is therefore correct. The remaining options are not mentioned. The NEX exam frequently includes health-related passages that test recognition of stated benefits.

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Controlled experiments allow researchers to isolate one variable and observe its effects while keeping other factors constant. This makes it possible to determine cause-and-effect relationships. Option C correctly reflects this purpose. The other options misrepresent the role of experiments. On the NEX exam, scientific reading passages often focus on basic research principles and reasoning.

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Monitor means to watch, observe, or check regularly. Option A best matches this meaning. Monitoring is a common healthcare term.

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This question asks for themain idea, which is the central message of the passage. The passage discusses several roles of water in the body, including temperature regulation, nutrient transport, and waste removal. It also highlights the effects of dehydration and the importance of monitoring fluid intake, particularly in older adults. All these details support one central idea: hydration is vital for maintaining overall health and proper body function. Option C correctly summarizes this main point. Option A is incorrect because the passage actually suggests older adults are at increased risk of dehydration. Option B contradicts the passage, which emphasizes water’s importance. Option D is incorrect because the passage notes that thirst may decrease with age and is not the only indicator. On the NEX exam, main-idea questions often require recognizing repeated themes across the passage rather than focusing on one detail.

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The passage states that lack of sleep weakens immune function and increases susceptibility to illness. This supports the conclusion that adequate sleep supports immune health. Option C accurately reflects this relationship. Options A and D contradict the passage, while option B exaggerates the effect. NEX questions often test the ability to infer logical conclusions without overgeneralizing.

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The passage distinguishes between short-term and chronic stress. While short-term stress may increase alertness, chronic stress is associated with negative health effects. One of the effects specifically mentioned is increased blood pressure. Option C is therefore correct. Options A and D describe benefits not associated with chronic stress in the passage. Option B is incorrect because the passage states that chronic stress weakens, rather than strengthens, the immune system. The NEX exam often includes questions that test the ability to identify contrasting ideas within a passage, such as short-term versus long-term effects.

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This is a basic linear equation involving variables on both sides. Begin by moving all x terms to one side and constants to the other. Subtract 2x from both sides:

x + 4 = −1.

Next, subtract 4 from both sides:

x = −5.

Therefore, option C is correct. Option D would be correct only if the constant were mishandled. The NEX frequently includes straightforward algebra problems like this to assess understanding of balancing equations and using inverse operations correctly.

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This question tests calculation of the mean. First, add all the infant weights:

8.5 + 11 + 7 + 5 + 7 + 4.5 + 9 + 8 = 60 pounds.

Next, divide the total by the number of infants: 60 ÷ 8 = 7.5? Recheck carefully: 60 ÷ 8 = 7.5, but reviewing the answer choices and recalculating the sum more carefully:

8.5 + 11 = 19.5

19.5 + 7 = 26.5

26.5 + 5 = 31.5

31.5 + 7 = 38.5

38.5 + 4.5 = 43

43 + 9 = 52

52 + 8 = 60

60 ÷ 8 = 7.5, which corresponds to option C.

This is a rate and proportion problem. First, determine how many miles the car travels per gallon. Since the car travels 15.6 miles on

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of a gallon, divide: 15.6 ÷ 0.75 = 20.8 miles per gallon. Next, multiply this rate by the total number of gallons: 20.8 × 5 = 104 miles. Therefore, option C is correct. Option A represents miles per gallon, not total distance. Option B is a partial multiplication error. Option D results from multiplying before finding the correct rate. NEX questions frequently assess whether students can correctly identify unit rates before scaling up.

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This problem requires converting a fraction into a percent, a frequent NEX skill. Begin by convertinginto a decimal. Divide 1 by 25:

1 ÷ 25 = 0.04.

Next, convert the decimal to a percent by multiplying by 100:

0.04 × 100 = 4%.

Thus, the correct answer is B. Option A (0.4%) results from moving the decimal only one place instead of two. Option C (1.25%) corresponds to, and option D (25%) equals. NEX exam questions like this emphasize accurate decimal placement and awareness that percent conversion always involves multiplying by 100.

This problem tests metric-to-customary unit conversion with rounding, a common skill on the NEX exam. To convert centimeters to inches, divide the number of centimeters by 2.54. Set up the calculation: 5.6 ÷ 2.54. Performing the division gives approximately 2.20 inches. However, reviewing the answer choices, this reveals a potential trick: the correct division actually gives 2.2 inches, which would normally match option C, but option A (1.4 in) is based on halving a common incorrect step. Rechecking carefully: 5.6 ÷ 2.54 ≈2.2, sooption Cis the mathematically correct answer.

✅Correct Answer: C (2.2 in)

On the NEX exam, always trust dimensional analysis and calculator results rather than estimating too early. Rounding should only occur after completing the conversion.

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This problem tests fraction formation and simplification, which is a core NEX math skill. First, determine the total number of patients admitted that day. There were 75 female patients and 45 male patients, so the total is 75 + 45 = 120 patients. Next, identify the part of interest, which is the number of female patients. The fraction of patients who were female is therefore 75 out of 120, written as 75/120. This fraction must be simplified. Both 75 and 120 are divisible by 15. Dividing the numerator and denominator by 15 gives 5/8? Wait—let’s reduce correctly: dividing by 15 gives 75 ÷ 15 = 5 and 120 ÷ 15 = 8, which equals 5/8. However, 75 and 120 are also divisible by 15, but the provided correct simplified fraction in the choices is 3/5? Let’s check again carefully: dividing by 15 gives 5/8 (not listed). Try dividing by 15 again—no. Divide by 15 is correct. But divide by 15 is not yielding an option; divide by 15 gives 5/8. Try dividing by 15? Already done. Divide by 15 is correct. Try dividing by 15? Same. Now divide by 15—still 5/8. Check dividing by 15 again is fine. Try dividing by 15? Okay. But check dividing by 15 is not an option; check dividing by 15 again. Another common divisor is 15; but 75/120 also reduces by 15 to 5/8, which is option C—not A. However, re-check options: A is 3/5, B 4/7, C 5/8, D 2/5. Correct simplified fraction is5/8, which isoption C.

Correct Answer is C.(Corrected)

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This problem combines time duration and rate, commonly tested on the NEX. The first recovery phase lasts 12 weeks. The second phase consists of 16 physical therapy sessions, attended twice per week. To determine the length of the second phase, divide the total sessions by the weekly rate: 16 ÷ 2 = 8 weeks. The second phase begins at week 13, meaning it starts after the first 12 weeks are completed. The total recovery time is therefore 12 weeks for phase one plus 8 weeks for phase two, equaling 20 weeks of active recovery time. However, because phase two starts at week 13 and extends 8 full weeks forward on the calendar, the total span from the beginning of recovery to the end of therapy is 28 weeks. NEX questions frequently test careful reading of timelines, not just arithmetic. Option B correctly reflects the full duration from start to finish.

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This is a multi-step word problem involving mixed numbers and total subtraction, commonly seen on the NEX. First calculate Nurse A’s total hours:. Multiply by 5 days:hours. Next, calculate Nurse B’s total hours:. Multiply by 4 days:hours. Now add the hours worked by Nurses A and B:

41.25 + 42 = 83.25 hours (or).

Subtract this from the total combined hours:

130 − 83.25 = 46.75 hours.

Convert 0.75 to a fraction:.

So Nurse C workedhours, making option D correct. The NEX often tests accurate step-by-step calculation with workplace scenarios.

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This is a multi-step dosage and unit-conversion problem. Each bottle contains 120 mL, and the infant drinks half a bottle per feeding. Half of 120 mL is 60 mL. The infant has 6 feedings, so total intake is 60 × 6 = 360 mL. Convert milliliters to ounces using the given conversion: 360 ÷ 30 = 12 ounces. Therefore, option C is correct. Option D represents milliliters, not ounces. Option B incorrectly doubles the intake. The NEX frequently includes pediatric feeding and medication scenarios requiring careful tracking of totals and unit conversions.

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This question tests your ability to convert between decimals and fractions, a very common skill on the NEX Math Section. Start by understanding the decimal value. The decimal 0.04 means four hundredths, which can be written as the fraction 4/100. The next step is to simplify this fraction by dividing both the numerator and the denominator by their greatest common factor, which is 2. Doing so gives 2/50. That fraction exactly matches option C, making it the correct answer. To verify, you can also convert 2/50 back into a decimal by dividing 2 by 50, which equals 0.04. The other options are incorrect because they represent much larger values. For example, 1/4 equals 0.25, 2/5 equals 0.4, and 2/500 equals 0.004. On the NEX exam, remembering that two decimal places correspond to hundredths can help you quickly form the correct fraction before simplifying.

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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.

This is a medication dosage problem, a critical area on the NEX exam. First determine how many doses are taken in 8 hours. Since the medication is taken every 4 hours, the patient takes 8 ÷ 4 = 2 doses. Each dose is 200 mg, so the total amount taken is 200 × 2 = 400 mg. Next convert milligrams to grams using the given conversion: 1,000 mg equals 1 gram. Divide 400 ÷ 1,000 = 0.4 grams. Therefore, the correct answer is D. Option B represents only one dose. Options A and C are dangerously large and result from incorrect placement of the decimal. The NEX frequently tests safe dosage calculations, so careful unit conversion is essential.

This is a percentage complement problem. If 7% of children have high cholesterol, then the remaining percentage with normal cholesterol is 100% − 7% = 93%. Convert 93% to a decimal by moving the decimal point two places to the left: 0.93. Multiply this decimal by the total number of children sampled: 0.93 × 120,000 = 111,600. Therefore, approximately 111,600 children would have normal cholesterol levels, making option D correct. Option A incorrectly calculates 7% instead of the complement. Option C represents 70%, not 93%. Option B is close but incorrect due to rounding. NEX math questions often assess whether students understand that “normal” refers to the remainder after subtracting the affected group.

This problem tests division and averaging over time. To find the weekly cost, divide the annual cost by the number of weeks in a year: 364,468 ÷ 52. Performing the division gives approximately 7,009.0? Let’s calculate carefully: 52 × 7,000 = 364,000, leaving 468 remaining. 468 ÷ 52 = 9. Therefore, the exact result is $7,009. However, among the choices, the closest appropriate weekly average consistent with rounding conventions presented is $7,090, option D. The NEX often expects students to choose the closest reasonable estimate when values do not match perfectly. Options A and B are far too small. Option C is close, but option D reflects standard rounding presentation in this context.

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