Nursing Elites

1. What type of bond forms between elements when they share electrons?

• A. Covalent bond
• B. Ionic bond
• C. Metallic bond
• D. Hydrogen bond

Correct answer: A

Rationale: The correct answer is A: Covalent bond. In a covalent bond, atoms share electrons, leading to the creation of a strong attraction that holds them together. This type of bond is characterized by the sharing of electron pairs between atoms, resulting in the formation of molecules. Choice B, Ionic bond, involves the transfer of electrons from one atom to another, creating charged ions that attract each other. Choice C, Metallic bond, refers to the sharing of electrons among a sea of delocalized electrons in a metal structure. Choice D, Hydrogen bond, is a weak electrostatic attraction between a hydrogen atom and an electronegative atom like oxygen or nitrogen, not involving the sharing of electrons.

2. Choose the most appropriate word to complete the sentence: 'He was _____ about his upcoming presentation.'

• A. apprehensive
• B. bored
• C. excited
• D. relieved

Correct answer: A

Rationale: The correct answer is 'apprehensive.' In the context of an upcoming presentation, being apprehensive implies a sense of worry or nervousness. This aligns well with the situation where one might feel uneasy or concerned about their upcoming presentation. The word 'bored' (choice B) is incorrect as it does not convey the right emotion for this context. 'Excited' (choice C) and 'relieved' (choice D) do not match the expected sentiment of worry or nervousness associated with an upcoming presentation, making them incorrect choices.

3. What describes a cell’s reaction to being placed in a hypertonic solution?

• A. The cell will shrink as water is pulled out of the cell to equalize the concentrations inside and outside of the cell.
• B. The cell will swell as water is pulled into the cell to equalize the concentrations inside and outside of the cell.
• C. The cell will remain the same size since the concentrations inside and outside the cell are equal to begin with.
• D. The pH inside the cell will drop in order to equalize the pH inside and outside the cell.

Correct answer: A

Rationale: A cell placed in a hypertonic solution has a higher solute concentration outside the cell compared to inside. This creates a concentration gradient that causes water to move out of the cell through osmosis to equalize the concentrations on both sides. As a result, the cell will shrink or undergo plasmolysis, as water is pulled out of the cell. Choice B is incorrect because a hypertonic solution causes water to move out of the cell, leading to shrinkage rather than swelling. Choice C is incorrect as a hypertonic solution results in a concentration gradient that leads to water leaving the cell, causing it to shrink. Choice D is incorrect because pH is not directly affected by being placed in a hypertonic solution; the change in solute concentration primarily impacts water movement.

4. A scientist wants to measure how far a person can run in 30 minutes. Which of the following units should be used to record this measurement as a small number?

• A. Gigameters
• B. Kilometers
• C. Megameters
• D. Terameters

Correct answer: B

Rationale: Kilometers are commonly used for shorter distances and would provide a small and practical number to measure distance in this context. Gigameters, Megameters, and Terameters are much larger units of measurement and would result in very large numbers, making them impractical for measuring the distance a person can run in 30 minutes. Therefore, the correct choice is Kilometers as it is a suitable unit for measuring such distances within a reasonable range.

5. Which of the following pairs of examples from the passage best demonstrates why the use of plastics is a divisive topic?

• A. Plastic has advantages. Plastic is difficult to recycle efficiently.
• B. Plastic is consumed by birds. Plastic is entering our food.
• C. Plastic is popular. Plastic is used for packaging.
• D. Plastic is in landfills. Plastic is in the ocean.

Correct answer: A

Rationale: The examples of plastic's advantages and difficulties in recycling show why the topic is divisive. The passage mentions that plastic has advantages, but it is difficult to recycle efficiently, indicating a conflict between the benefits and environmental impact of plastics. This conflict contributes to the divisive nature of discussions surrounding the use of plastics. Choices B, C, and D do not provide contrasting examples that highlight the divisive nature of the topic.

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