Nursing Elites

1. How can a single gene mutation lead to multiple phenotypes depending on the organism?

• A. Pleiotropy describes the effect of one gene influencing multiple seemingly unrelated traits.
• B. Epigenetics involves environmental factors modifying gene expression without altering the DNA sequence.
• C. Genetic drift refers to random changes in allele frequencies within a population.
• D. Gene regulation controls the timing and level of gene expression within an organism.

Correct answer: A

Rationale: A single gene mutation can lead to multiple phenotypes through pleiotropy, where one gene influences diverse traits or functions in an organism. This phenomenon occurs when the mutated gene affects different biochemical pathways, developmental processes, or cellular functions, resulting in a cascade of downstream effects that manifest as a variety of phenotypic outcomes. Choice B, epigenetics, involves modifications in gene expression influenced by environmental factors without altering the DNA sequence, which is not directly related to the question about single gene mutations causing multiple phenotypes. Choice C, genetic drift, refers to random changes in allele frequencies within a population, which is unrelated to the impact of a single gene mutation on multiple phenotypes. Choice D, gene regulation, focuses on controlling the timing and level of gene expression within an organism, which is not directly addressing how a single gene mutation can lead to diverse phenotypes.

2. Which of the following examples would be a good transition sentence?

• A. You will have an instructor and a syllabus with a list of the books you will need to read.
• B. Taking a course online is in many ways similar to taking a course in a traditional classroom setting.
• C. You will even have class discussions and one-on-one meetings with your professor.
• D. However, online students often work entirely from home, which is just one part of what makes online learning different.

Correct answer: D

Rationale: The sentence 'However, online students often work entirely from home, which is just one part of what makes online learning different.' provides a contrast and smoothly transitions to a discussion of what makes online learning distinct from traditional classroom settings. Choice A talks about the components of a course but does not transition to a new point. Choice B discusses similarities between online and traditional courses, which does not transition to a new topic. Choice C focuses on interactions with professors but does not transition to a new idea.

3. What type of writing is used in the passage?

• A. narrative
• B. persuasive
• C. expository
• D. technical

Correct answer: C

Rationale: The passage is expository because it presents information about 'The Five' group of Russian musicians and their contributions to classical music. It provides details about the background, works, and influence of each member of the group without telling a story, providing instructions, or attempting to persuade the reader. Choice A (narrative) is incorrect because the passage does not tell a story but rather presents factual information. Choice B (persuasive) is incorrect because the passage does not try to persuade the reader but instead informs about the musicians. Choice D (technical) is incorrect because the passage does not focus on technical details or procedures but rather on historical and musical information.

4. When defending a scientific argument, which technique is most effective?

• A. Citing other scientists who agree with your argument.
• B. Showing the results of scientific experiments that support your argument.
• C. Describing your scientific credentials, education, and past accomplishments.
• D. Pointing out that no one has come up with a proven alternative explanation.

Correct answer: B

Rationale: The most effective technique when defending a scientific argument is to show the results of scientific experiments that support your argument. In the realm of science, evidence-based support is crucial. By presenting concrete data and experimental results, you provide a convincing and reliable foundation for your argument. This method allows others to review, replicate, and verify the findings, thus strengthening the credibility of your position. Choices A, C, and D are not as effective as choice B because citing other scientists who agree with your argument (Choice A) may not carry the same weight as empirical evidence, describing your scientific credentials, education, and past accomplishments (Choice C) may not directly address the validity of your argument, and pointing out that no one has come up with a proven alternative explanation (Choice D) does not provide direct evidence supporting your argument.

5. A symbiotic relationship where one organism benefits and the other is not harmed is called:

• A. Mutualism
• B. Commensalism
• C. Parasitism
• D. Predation

Correct answer: B

Rationale: B) Commensalism: In commensalism, one organism benefits while the other is neither helped nor harmed. This is the relationship described in the question. The correct answer is Commensalism because it specifically fits the scenario where one organism benefits without affecting the other. A) Mutualism: In mutualism, both organisms involved benefit from the relationship. C) Parasitism: In parasitism, one organism benefits at the expense of the other organism, which is harmed. D) Predation: In predation, one organism (predator) kills and consumes another organism (prey) for food.

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