Nursing Elites

1. Which vitamin is synthesized in the skin upon exposure to sunlight?

• A. Vitamin A
• B. Vitamin C
• C. Vitamin D
• D. Vitamin E

Correct answer: C

Rationale: Vitamin D is synthesized in the skin upon exposure to sunlight. When the skin is exposed to sunlight, a form of cholesterol in the skin is converted into vitamin D3 (cholecalciferol) through a series of chemical reactions. Vitamin D plays a crucial role in calcium absorption and bone health. Choice A, Vitamin A, is not synthesized in the skin upon exposure to sunlight; it is obtained through dietary sources. Choice B, Vitamin C, is not synthesized in the skin upon exposure to sunlight either. Vitamin C is obtained through dietary sources like fruits and vegetables. Choice D, Vitamin E, is not synthesized in the skin upon exposure to sunlight. Vitamin E is a fat-soluble vitamin that acts as an antioxidant and is obtained through dietary sources like nuts, seeds, and vegetable oils.

2. Which of the following examples from the paragraph about the Silk Road is a transition sentence?

• A. The Silk Road got its name from Chinese silk, which was a major item traded along the route.
• B. However, there were many other important trade items, some of which would end up changing the world forever.
• C. Because the Silk Road was not just one single road, historians also use the term 'Silk Routes' to describe the network.
• D. The Silk Road was an ancient network of trade routes that stretched from China through India all the way to Africa, Greece, Rome, and Great Britain.

Correct answer: B

Rationale: Choice B is the correct answer because it serves as a transition sentence in the paragraph about the Silk Road. It shifts the focus from Chinese silk being a major trade item to the introduction of other important trade items that had a significant impact on the world. This transition indicates a change in the topic being discussed within the paragraph. Choices A, C, and D do not serve as transition sentences. Choice A simply introduces the origin of the Silk Road's name, choice C provides additional information about the network without transitioning to a new topic, and choice D gives a general description of the Silk Road without transitioning to a different aspect of the trade routes.

3. Which of the following is NOT a source of genetic variation in a population?

• A. Mutations in genes
• B. Genetic drift (random fluctuations in allele frequencies)
• C. Gene flow (movement of genes between populations)
• D. Blending inheritance (traits of parents are averaged in offspring)

Correct answer: D

Rationale: Rationale: A) Mutations in genes: Mutations are changes in the DNA sequence that can introduce new alleles into a population, leading to genetic variation. B) Genetic drift (random fluctuations in allele frequencies): Genetic drift refers to random changes in allele frequencies in a population, which can lead to genetic variation through chance events. C) Gene flow (movement of genes between populations): Gene flow occurs when individuals move between populations, bringing new alleles with them and increasing genetic variation within populations. D) Blending inheritance (traits of parents are averaged in offspring): Blending inheritance was a historical theory that suggested offspring inherit a blend of traits from their parents, leading to a reduction in genetic variation over time. However, this concept has been disproven by the understanding of Mendelian genetics, where traits are inherited independently and do not blend together. Therefore, blending inheritance does not contribute

4. What is 0.004 as a ratio?

• A. 5:10
• B. 1:250
• C. 7:28
• D. 4:00

Correct answer: B

Rationale: To convert 0.004 to a ratio, first express it as a fraction by writing it as 4/1000. Simplifying this fraction gives 1/250. Therefore, 0.004 as a ratio is 1:250. Choice A (5:10) simplifies to 1:2, not equivalent to 0.004. Choice C (7:28) does not simplify to a value close to 0.004. Choice D (4:00) is not a valid ratio representation of 0.004.

5. Unfortunately, the belief that changelings could be convinced to leave was not just an innocuous superstition; however, on some occasions, harm came to the individual who was thought to be a changeling. Which is the best way to revise and combine the underlined portion of the sentences?

• A. an innocuous superstition, on some occasions,
• B. an innocuous superstition, but on some occasions,
• C. an innocuous superstition; however, on some occasions,
• D. an innocuous superstition: on some occasions,

Correct answer: C

Rationale: The best way to revise and combine the underlined portion of the sentences is by using a semicolon to show a stronger connection between the two ideas. Using 'however' after the semicolon helps to contrast the innocuous superstition with the negative outcome that sometimes occurred, providing a smoother flow between the ideas. Choice A is incorrect as it lacks a proper conjunction or punctuation to connect the ideas. Choice B is incorrect as 'but' does not effectively contrast the ideas as 'however' does. Choice D is incorrect as a colon is used to introduce a list or explanation, which is not suitable in this context where a contrast is needed.

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