Nursing Elites

1. Which enzyme plays a crucial role in DNA replication during the S phase of interphase?

• A. Helicase
• B. DNA polymerase
• C. Ligase
• D. Topoisomerase

Correct answer: B

Rationale: During the S phase of interphase, DNA replication takes place. DNA polymerase is the enzyme responsible for synthesizing new DNA strands by adding nucleotides in a complementary manner to the template strand. It plays a pivotal role in accurately replicating the entire genome. While helicase unwinds the double-stranded DNA for replication, topoisomerase relieves the tension in the DNA strands, and ligase joins the Okazaki fragments on the lagging strand. However, DNA polymerase directly participates in the synthesis of new DNA strands during replication, making it the correct answer.

2. Which adjective best describes the following setting: 'A lone cabin stood nestled amongst towering pines, smoke curling from its chimney into the crisp mountain air'?

• A. Bland
• B. Urban
• C. Idyllic
• D. Sterile

Correct answer: C

Rationale: The correct answer is 'Idyllic' because it accurately captures the peaceful and picturesque nature of the setting. The image of a lone cabin nestled among towering pines with smoke curling from its chimney into the crisp mountain air evokes a sense of tranquility and beauty. 'Bland' (choice A) is incorrect as it suggests something dull or uninteresting, which does not align with the vivid imagery described. 'Urban' (choice B) is also incorrect as it refers to a city or town setting, which is the opposite of the isolated cabin in the mountains. 'Sterile' (choice D) is incorrect as it conveys a lack of warmth and character, which is not reflective of the cozy and inviting atmosphere portrayed in the description.

3. Identify the main clause in the sentence: 'Although she was tired, she finished her work on time.'

• A. Although she was tired
• B. She was tired
• C. She finished her work on time
• D. Finished her work on time

Correct answer: C

Rationale: The main clause is the independent clause that can stand alone as a complete sentence. In this sentence, 'She finished her work on time' is the main clause because it expresses a complete thought independently. Choices A and B are subordinate clauses as they cannot stand alone as complete sentences. Choice D lacks the subject 'she,' making it incomplete and not a main clause.

4. What cellular process ensures the accurate transmission of genetic material during cell division?

• A. Mitosis (somatic cell division)
• B. Meiosis (germ cell division)
• C. Replication (DNA duplication)
• D. Transcription (DNA to RNA conversion)

Correct answer: A

Rationale: Mitosis is the correct answer. Mitosis is the process by which somatic cells divide to produce two identical daughter cells. During mitosis, the genetic material is accurately replicated and distributed to ensure each daughter cell receives a complete set of chromosomes. This process is crucial for growth, repair, and maintenance of multicellular organisms. Meiosis, on the other hand, is the type of cell division that occurs in germ cells to produce gametes (sperm and egg cells), focusing on genetic diversity through recombination and reduction of chromosome number. Replication is the process of copying DNA to produce an identical copy, essential for cell division but not the specific process ensuring accurate genetic material transmission. Transcription involves copying DNA into RNA, crucial for gene expression but not directly related to the accurate transmission of genetic material during cell division.

5. What happens to the density of a substance if its mass increases while its volume remains constant?

• A. Density increases
• B. Density decreases
• C. Density remains constant
• D. Density becomes zero

Correct answer: A

Rationale: When the mass of a substance increases while its volume remains constant, the density, which is calculated by dividing mass by volume, will increase. This is because with a higher mass and the volume staying the same, the ratio of mass to volume (density) will be greater, resulting in an overall increase in density. Choice B, 'Density decreases,' is incorrect because an increase in mass with constant volume leads to a higher density. Choice C, 'Density remains constant,' is incorrect as an increase in mass will cause the density to increase. Choice D, 'Density becomes zero,' is incorrect because even with an increase in mass, as long as volume remains constant, density will not reach zero; it will increase instead.

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