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| Section | Weight | Objectives |
|---|---|---|
| Science | 36.8% | - Human Anatomy
|
| Mathematics | 27.6% | - Numbers and Operations
|
| Verbal Ability | 35.6% | - Reading Comprehension
|
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NEW QUESTION # 52
Which organ system can alter the amount of CO# in the blood?
Answer: D
Explanation:
The respiratory system directly regulates the level of carbon dioxide (CO#) in the blood. CO# is a waste product of cellular respiration and is removed from the body through exhalation. When breathing rate increases, more CO# is expelled, lowering blood CO# levels. When breathing slows, CO# levels rise. While the cardiovascular system transports CO#, it does not regulate its concentration. The urinary system regulates pH and fluid balance but does not directly remove CO#. The endocrine system controls hormones, not gas exchange. The NEX Science exam frequently emphasizes the role of the respiratory system in maintaining acid-base balance through CO# regulation.
NEW QUESTION # 53
What is the term used to describe random changes in DNA, which may be silent, negative, or positive, to the organism in which they occur?
Answer: A
Explanation:
A mutation is a random change in the DNA sequence of an organism. Mutations can occur due to errors during DNA replication, exposure to radiation, or chemical agents. These changes may have no effect (silent mutations), cause harm (negative mutations), or provide an advantage (positive mutations). Recombination refers to the exchange of genetic material during meiosis, not random DNA changes. Duplication involves copying a segment of DNA, and replication is the normal process of copying DNA before cell division. The NEX Science exam often emphasizes that mutations are a source of genetic variation and can influence evolution and disease. Understanding the different possible effects of mutations is essential for topics related to genetics, cancer biology, and inheritance.
NEW QUESTION # 54
Word Knowledge
The word"reluctant"most nearly means:
Answer: B
Explanation:
"Reluctant" describes someone who is unwilling or hesitant to act. Option C best matches this meaning. The other options suggest eagerness or readiness, which are opposites. Context clues on the NEX often rely on emotional tone.
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NEW QUESTION # 55
A healthcare provider recommends that a patient take 200 milligrams (mg) of a pain reliever every 4 hours.
How many grams of the pain reliever should the patient have taken after 8 hours if the recommendation was followed?
(Given 1,000 mg = 1 gram.)
Answer: D
Explanation:
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.
NEW QUESTION # 56
Which of the following is the correct classification of a penny made only of copper?
Answer: A
Explanation:
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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NEW QUESTION # 57
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