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| Section | Weight | Objectives |
|---|---|---|
| Mathematics | 27.6% | - Numbers and Operations
|
| Verbal Ability | 35.6% | - Word Knowledge
|
| Science | 36.8% | - Human Anatomy
|
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NEW QUESTION # 70
Milk, pure water, lemon juice, and gastric juice were tested using a pH meter. Results are summarized in the chart below.
Substance | pH
Milk | 6.8
Pure water | 7
Lemon juice | 2
Gastric juice | 1
Which substance is the most acidic?
Answer: A
Explanation:
The pH scale measures acidity and alkalinity, ranging from 0 to 14. Lower pH values indicate higher acidity, while higher pH values indicate greater alkalinity. A pH of 7 is considered neutral. In the chart provided, gastric juice has a pH of 1, which is the lowest value listed, making it the most acidic substance. Lemon juice, with a pH of 2, is also acidic but less so than gastric juice. Milk is slightly acidic, and pure water is neutral.
Gastric juice contains hydrochloric acid, which aids digestion and destroys harmful microorganisms in the stomach. The NEX Science exam frequently tests understanding of the pH scale and its physiological relevance, particularly in digestive processes.
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NEW QUESTION # 71
Prepared bottles contain 120 milliliters (mL) of infant formula. An infant drinksbottle every 2 hours for each of their 6 daytime feedings.
Given 1 ounce = 30 mL, how many ounces did the infant drink?
Answer: B
Explanation:
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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NEW QUESTION # 72
What is the term for small, clear vessels found near blood capillaries and responsible for draining excess interstitial fluid not reabsorbed into the blood?
Answer: D
Explanation:
Lymphatic capillaries are small, thin-walled vessels that collect excess interstitial fluid that is not reabsorbed by blood capillaries. This fluid, now called lymph, is transported through the lymphatic system and eventually returned to the bloodstream. This process helps maintain fluid balance and prevents tissue swelling. Arterioles and venules are part of the blood vascular system, not the lymphatic system. Immune capillaries are not a recognized anatomical structure. The NEX Science exam often tests the relationship between the circulatory and lymphatic systems, emphasizing the role of lymphatic capillaries in fluid regulation and immune defense.
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NEW QUESTION # 73
During prolonged, strenuous physical activity, muscle cells undergo a type of anaerobic respiration that produces
Answer: D
Explanation:
When oxygen levels are insufficient during intense exercise, muscle cells switch from aerobic respiration to anaerobic respiration. In this process, pyruvic acid is converted into lactic acid. The production of lactic acid allows glycolysis to continue generating ATP in the absence of oxygen. However, lactic acid buildup contributes to muscle fatigue and soreness. Carbon dioxide is primarily produced during aerobic respiration, and hydrogen ions are a byproduct but not the main substance emphasized in anaerobic respiration. The NEX Science exam frequently tests metabolic pathways related to exercise and energy production, making lactic acid the correct answer.
NEW QUESTION # 74
Which neuron carries the impulse from a receptor to the central nervous system?
Answer: B
Explanation:
Sensory neurons, also known as afferent neurons, carry impulses from sensory receptors to the central nervous system (brain and spinal cord). These neurons transmit information such as touch, temperature, pain, and pressure. Motor (efferent) neurons carry impulses away from the CNS to muscles or glands. Association neurons, also called interneurons, connect sensory and motor neurons within the CNS. The NEX Science exam frequently tests neural pathways and directional flow of nerve impulses, making sensory neurons the correct answer for signals traveling from receptors to the CNS.
NEW QUESTION # 75
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