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NEW QUESTION # 32
The graph below shows the growth projections of four infants during their first year of life.
Based on these projections, how many weeks will it take for all infants to reach at least 30 pounds?
- A. 25 weeks
- B. 42 weeks
- C. 35 weeks
- D. 22 weeks
Answer: A
Explanation:
This question tests interpretation of a line graph, a common NEX skill. To answer, focus on the infant whose weight increases the slowest, becauseallinfants must reach at least 30 pounds. By examining the graph, Infant A has the lowest growth curve and reaches 30 pounds later than the others. Tracing horizontally from 30 pounds to Infant A's line and then down to the x-axis shows that this occurs at approximately 25 weeks.
Although some infants reach 30 pounds earlier, the question asks whenallinfants reach that weight, which is determined by the slowest-growing infant. Therefore, option D is correct. The NEX often includes graph- based questions that require identifying minimums or maximums across multiple data sets, so it is important to carefully read qualifiers like "all," "at least," or "no more than."
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NEW QUESTION # 33
Word Knowledge
The word"temporary"most nearly means:
- A. Severe
- B. Permanent
- C. Frequent
- D. Brief
Answer: D
Explanation:
Temporary refers to something lasting for a short period of time. Option B correctly reflects this meaning.
Recognizing time-related descriptors is common on the NEX exam.
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NEW QUESTION # 34
Which of the following molecules is an electrolyte normally found in the blood?
- A. Lactase
- B. H#O
- C. Iodine
- D. Ca²#
Answer: D
Explanation:
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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NEW QUESTION # 35
Given that 1 foot = 12 inches and 1 inch = 2.54 centimeters, approximately how many centimeters are there in
10 feet?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
Explanation:
This problem tests multi-step unit conversion, a frequent topic on the NEX Math Section. First, convert feet to inches. Since 1 foot equals 12 inches, 10 feet equals 10 × 12 = 120 inches. Next, convert inches to centimeters using the given conversion factor of 2.54 centimeters per inch. Multiply 120 × 2.54 = 304.8 centimeters. The question asks for an approximate value, so rounding is appropriate. Rounding 304.8 gives approximately 305 centimeters. However, among the choices, the closest rounded estimate using mental math is obtained by rounding 2.54 to about 3. Using estimation: 120 × 3 = 360 centimeters, which corresponds to option A. The NEX often expects estimation when the word "approximately" is used. Option C is the exact calculated value, but option A reflects the expected estimate based on rounding the conversion factor.
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NEW QUESTION # 36
Which fraction is equal to 0.04?
- A. 2/500
- B. 2/5
- C. 1/4
- D. 2/50
Answer: D
Explanation:
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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NEW QUESTION # 37
What is the correct order of blood flow through the cardiovascular system?
- A. Heart # arteries # capillaries # veins # heart
- B. Heart # venules # capillaries # arterioles # heart
- C. Heart # arteries # veins # capillaries # heart
- D. Heart # veins # lymphatics # arteries # heart
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 # 38
Reading Comprehension
Passage:
Medical research relies on controlled experiments to test hypotheses. By controlling variables, researchers can determine whether observed effects are due to the factor being studied.
Why are controlled experiments important?
- A. They help identify cause-and-effect relationships
- B. They ensure results are random
- C. They eliminate the need for observation
- D. They guarantee identical outcomes
Answer: A
Explanation:
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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NEW QUESTION # 39
Word Knowledge
The word"implement"most nearly means:
- A. Carry out
- B. Ignore
- C. Avoid
- D. Delay
Answer: A
Explanation:
To implement means to put a plan or decision into action. Option B is the correct synonym. This word is frequently used in healthcare policies and procedures.
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NEW QUESTION # 40
Word Knowledge
The word"restrict"most nearly means:
- A. Expand
- B. Allow
- C. Limit
- D. Encourage
Answer: C
Explanation:
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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NEW QUESTION # 41
Word Knowledge
The word"decline"most nearly means:
- A. Refuse or decrease
- B. Improve
- C. Observe
- D. Increase
Answer: A
Explanation:
"Decline" can mean either to refuse or to decrease. Option C captures both meanings. The other options are opposites or unrelated. Understanding multiple meanings of common words is important for the NEX verbal section.
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NEW QUESTION # 42
During translation, the cell produces proteins by using information from
- A. rRNA.
- B. mRNA.
- C. tRNA.
- D. siRNA.
Answer: B
Explanation:
Translation is the process by which proteins are synthesized at the ribosome. During this process, the genetic code carried by messenger RNA (mRNA) is read in groups of three nucleotides called codons. Each codon specifies a particular amino acid, which is added to a growing protein chain. Transfer RNA (tRNA) brings amino acids to the ribosome but does not contain the original instructions. Ribosomal RNA (rRNA) forms the structural and functional core of the ribosome, and siRNA is involved in gene silencing rather than protein synthesis. Because mRNA carries the direct genetic instructions copied from DNA during transcription, it is the correct source of information used during translation. The NEX Science section frequently tests understanding of the central dogma of molecular biology: DNA # RNA # protein.
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NEW QUESTION # 43
Animal cells contain mitochondria, while plant cells contain both mitochondria and chloroplasts. What does that tell us about their functions?
- A. Both animal and plant cells can perform photosynthesis and cellular respiration.
- B. Only animal cells can perform photosynthesis; both can perform cellular respiration.
- C. Only plant cells can perform photosynthesis; both can perform cellular respiration.
- D. Only animal cells can perform cellular respiration, and only plants can perform photosynthesis.
Answer: C
Explanation:
Mitochondria are responsible for cellular respiration, which occurs in both plant and animal cells.
Chloroplasts carry out photosynthesis and are found only in plant cells. Therefore, only plants can perform photosynthesis, while both plants and animals can perform cellular respiration. This distinction is a core concept in cell biology and is frequently tested on the NEX Science exam.
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NEW QUESTION # 44
Word Knowledge
The word"fatigue"most nearly means:
- A. Hunger
- B. Excitement
- C. Energy
- D. Tiredness
Answer: D
Explanation:
Fatigue refers to extreme tiredness or exhaustion. Option C correctly matches this meaning. NEX exams often include common clinical terms like fatigue.
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NEW QUESTION # 45
Review the table of undisturbed sedimentary rock strata below.
According to the table, which of these fossils is the oldest?
- A. Fossil D
- B. Fossil A
- C. Fossil C
- D. Fossil B
Answer: B
Explanation:
This question tests understanding of the law of superposition, a fundamental principle in geology that is frequently tested on the NEX Science exam. The law of superposition states that in undisturbed sedimentary rock layers, the oldest layers are found at the bottom, while the youngest layers are found at the top. In the table shown, the soil surface is at the top, followed by Fossil D, Fossil C, Fossil B, and Fossil A at the bottom.
Because Fossil A is located in the lowest rock layer, it must be the oldest fossil. Fossils found in higher layers were deposited more recently. The key word in the question is "undisturbed," which means the layers have not been mixed or overturned by geological processes. The NEX exam often emphasizes recognizing this clue to correctly apply the law of superposition. Therefore, Fossil A is the correct answer because it represents the earliest life form preserved in the rock strata.
NEW QUESTION # 46
When an individual sustains a torn ligament, the connection between which two structures is disrupted?
- A. Bone to artery
- B. Muscle to bone
- C. Bone to bone
- D. Muscle to nerve
Answer: C
Explanation:
Ligaments are strong bands of connective tissue that connect bone to bone at joints. Their primary function is to stabilize joints and prevent excessive movement. When a ligament is torn, the connection between two bones is disrupted, leading to joint instability. Tendons, not ligaments, connect muscle to bone. Nerves transmit electrical signals, and arteries transport blood. The NEX Science exam frequently includes musculoskeletal system questions that require distinguishing between ligaments and tendons, making bone-to- bone the correct answer.
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NEW QUESTION # 47
The light-sensitive cells of the eye are called rods and cones. In which of these layers of the eye are they found?
- A. Cornea
- B. Sclera
- C. Retina
- D. Choroid
Answer: C
Explanation:
Rods and cones are photoreceptor cells responsible for detecting light and color. These specialized cells are located in the retina, which is the innermost layer of the eye. The retina converts light energy into electrical signals that are transmitted to the brain via the optic nerve. Rods are more sensitive to low light and are important for night vision, while cones detect color and fine detail. The sclera is the tough, white outer layer of the eye that provides protection. The choroid contains blood vessels that supply nutrients to the eye, and the cornea is the transparent front portion that helps focus incoming light. Because rods and cones must directly receive light to function, they are located in the retina. This concept is commonly tested on the NEX Science exam in questions related to sensory organs and physiology.
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NEW QUESTION # 48
Which of the following structures is found only in bacterial cells, not in plant or animal cells?
- A. Ribosomes
- B. Cell membrane
- C. Nucleoid
- D. DNA
Answer: C
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 # 49
A doctor lowered a patient's dosage from 50 mg to 40 mg. What percent decrease was this?
- A. 25%
- B. 20%
- C. 12.5%
- D. 10%
Answer: B
Explanation:
This question tests percent decrease, a common NEX topic. First find the amount of decrease: 50 mg # 40 mg
= 10 mg. Next divide the decrease by the original amount:
10 ÷ 50 = 0.2.
Convert the decimal to a percent by multiplying by 100:
0.2 × 100 = 20%.
Therefore, the correct answer is B. Option D represents the numerical decrease without considering the original value. Option A and C result from incorrect division. On the NEX exam, percent change problems always use the original value as the denominator.
NEW QUESTION # 50
#3 # 7 =
- A. 0
- B. 1
- C. #4
- D. #10
Answer: D
Explanation:
This problem tests understanding of integer subtraction, especially with negative numbers. On the number line, #3 is already below zero. Subtracting 7 means moving seven more units to the left. Starting at #3 and moving left seven spaces results in #10. Another way to think about this is to rewrite the problem as adding a negative number: #3 # 7 is the same as #3 + (#7). When adding two negative numbers, you add their absolute values and keep the negative sign. The absolute values of #3 and #7 are 3 and 7, and 3 + 7 = 10, so the result is #10. Option A is therefore correct. Option B is a common mistake when students subtract absolute values incorrectly. Options C and D are positive and would only occur if the signs were misunderstood. The NEX Math Section frequently includes integer operations to assess number sense and sign awareness.
NEW QUESTION # 51
Express the fraction 3/15 as a percent.
Round to the nearest tenth place.
- A. 20.0%
- B. 33.3%
- C. 0.2%
- D. 5.0%
Answer: A
Explanation:
This problem tests fraction-to-percent conversion and rounding, a very common skill on the NEX Math Section. First, simplify the fraction if possible. The fraction 3/15 can be reduced by dividing both the numerator and denominator by 3. This gives 1/5. Simplifying first makes the calculation easier and reduces the chance of errors. Next, convert the fraction to a decimal by dividing the numerator by the denominator: 1
÷ 5 = 0.2. To convert a decimal to a percent, multiply by 100. Thus, 0.2 × 100 = 20.0%. The question asks for the answer rounded to the nearest tenth place. Since 20.0 already has one decimal place, no additional rounding is needed. Therefore, the correct answer is 20.0%, which corresponds to option A. Option B (0.2%) incorrectly leaves the value as a decimal percent. Option C (5.0%) is a common mistake from dividing 3 by
60. Option D (33.3%) would be correct for 1/3, not 3/15.
NEW QUESTION # 52
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?
- A. Forward flow of blood
- B. Blood leaking into the interstitial spaces
- C. Obstruction of blood flow
- D. Backflow of blood
Answer: D
Explanation:
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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NEW QUESTION # 53
Reading Comprehension
Passage:
Stress can affect both physical and mental health. Short-term stress may improve alertness, but chronic stress can weaken the immune system, increase blood pressure, and contribute to anxiety and depression.
Which effect of long-term stress is mentioned in the passage?
- A. Stronger immune response
- B. Increased blood pressure
- C. Improved concentration
- D. Faster healing
Answer: B
Explanation:
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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NEW QUESTION # 54
A car travels 15.6 miles on
3
4
4
3
of a gallon of gas. How many miles can the car travel on 5 gallons of gas?
- A. 20.8 miles
- B. 58.5 miles
- C. 104 miles
- D. 78 miles
Answer: C
Explanation:
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
3
4
4
3
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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NEW QUESTION # 55
A recipe for pancakes serves 4 people and requires 1.5 cups of flour.
If the cook wants to make enough pancakes to serve 8 people, how much flour is needed?
- A. 5.5 cups
- B. 1.5 cups
- C. 3 cups
- D. 8 cups
Answer: C
Explanation:
This is a proportional reasoning problem. If 4 people require 1.5 cups of flour, then doubling the number of people to 8 means doubling the amount of flour. Multiply 1.5 by 2:
1.5 × 2 = 3 cups.
Therefore, option D is correct. Option A is the original amount, not scaled. Option B greatly overestimates the amount. Option C results from incorrect multiplication. The NEX frequently includes scaling problems related to recipes, dosages, and supplies, so identifying when to multiply or divide is essential.
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NEW QUESTION # 56
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