Nursing Elites

1. Which type of glial cell provides structural support and insulation for neurons in the central nervous system?

• A. Schwann cells
• B. Astrocytes
• C. Oligodendrocytes
• D. Microglia

Correct answer: C

Rationale: Oligodendrocytes are a type of glial cell that provides structural support and insulation for neurons in the central nervous system by forming myelin sheaths around axons. Schwann cells (option A) perform a similar function but in the peripheral nervous system. Astrocytes (option B) are involved in providing nutrients to neurons, maintaining the chemical environment, and repairing damage. Microglia (option D) are primarily responsible for immune defense in the central nervous system, not for providing structural support and insulation for neurons.

2. Which of the following is a property of amphiprotic substances?

• A. React with acids only
• B. React with bases only
• C. Can act as both acids and bases
• D. Are inert in chemical reactions

Correct answer: C

Rationale: The correct answer is C: Can act as both acids and bases. Amphiprotic substances have the ability to donate a proton (act as an acid) or accept a proton (act as a base) depending on the reaction conditions. This dual nature allows them to participate in a wide range of chemical reactions, making them versatile and important in various chemical processes. Choices A and B are incorrect because amphiprotic substances are not limited to reacting with only acids or bases; they can interact with both. Choice D is incorrect because amphiprotic substances are not inert; they actively participate in chemical reactions by donating or accepting protons.

3. Which of the following terms describes the author's tone in the passage?

• A. Sarcastic
• B. Formal
• C. Informal
• D. Scientific

Correct answer: C

Rationale: The author's tone in the passage is informal. The passage provides a narrative about Hedy Lamarr's life and inventions, offering insights into her challenges and achievements in a conversational manner. The use of phrases like 'To relieve this boredom' and 'Just think, we might not have any of those things' indicates a casual and engaging tone, suitable for storytelling. Choice A, 'Sarcastic,' is incorrect as there is no evident use of sarcasm or irony in the passage. Choice B, 'Formal,' is incorrect because the tone is not stiff or ceremonious; instead, it is relaxed and personal. Choice D, 'Scientific,' is also incorrect as the tone is not focused on presenting technical information or research findings but rather on sharing a personal story.

4. Simplify the expression. What is the value of x? (5/4)x = 20

• A. 8
• B. 16
• C. 24
• D. 32

Correct answer: D

Rationale: To solve for x, multiply both sides by the reciprocal of 5/4 to isolate x. (4/5)(5/4)x = (4/5)20; x = 16. Therefore, the correct answer is 32. Choice A (8), Choice B (16), and Choice C (24) are incorrect as they do not represent the correct value of x obtained after correctly simplifying the expression.

5. What type of text includes the author's purpose, major ideas, supporting details, visual aids, and vocabulary as key elements?

• A. Fictional texts
• B. Persuasive texts
• C. Narratives
• D. Informational texts

Correct answer: D

Rationale: The key elements mentioned (author's purpose, major ideas, etc.) are typically associated with informational texts. Informational texts aim to inform and educate the reader, making use of these elements to convey factual information. Fictional texts focus more on storytelling, character development, and plot, while persuasive texts aim to convince or persuade the audience. Narratives are stories that can be fictional or non-fictional, emphasizing a sequence of events rather than the specific elements mentioned in the question.

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