Nursing Elites

1. From which of the following germ layers does the nervous system develop?

• A. Ectoderm
• B. Endoderm
• C. Gastroderm
• D. Mesoderm

Correct answer: A

Rationale: The correct answer is A: Ectoderm. The nervous system develops from the ectoderm, which is the outermost of the three germ layers. The ectoderm gives rise to structures such as the skin, hair, nails, and the entire nervous system. Choices B, C, and D are incorrect because the endoderm gives rise to the lining of the gut and associated organs, the gastroderm is not a recognized germ layer, and the mesoderm forms structures like muscles, bones, blood, and the circulatory system, but not the nervous system.

2. Which organizational style is used in the following passage? 'There are several reasons why the new student café has not been as successful as expected. One factor is that prices are higher than originally advertised, so many students cannot afford to buy food and beverages there.'

• A. Cause and effect order
• B. Compare and contrast order
• C. Spatial order
• D. Time order

Correct answer: A

Rationale: The correct organizational style used in the passage is cause and effect order. It explains the reasons (causes) why the new student café has not been successful, specifically mentioning that the higher prices lead to students being unable to afford food and beverages (effect). The passage clearly establishes a relationship between a situation (high prices) and its consequences (students not able to buy), making it a classic example of cause and effect. Choice B (Compare and contrast order) is incorrect as the passage does not present a comparison or a contrast between two or more items or situations. Choice C (Spatial order) is incorrect as it refers to organizing information based on physical location or direction, which is not applicable in this context. Choice D (Time order) is also incorrect as it involves organizing information based on a sequence of events over time, which is not the primary focus of the passage.

3. Which of the following enzymes unwinds the double-stranded DNA during replication?

• A. Helicase
• B. Ligase
• C. Nuclease
• D. Polymerase

Correct answer: A

Rationale: Helicase is the enzyme responsible for unwinding the double-stranded DNA during replication by breaking the hydrogen bonds between the base pairs. This process creates the replication fork where DNA polymerase can then synthesize new DNA strands. Ligase functions to join Okazaki fragments on the lagging strand, not unwind DNA. Nuclease is involved in DNA repair by removing damaged DNA segments. Polymerase is responsible for synthesizing new DNA strands based on the existing template strands, not for unwinding the DNA.

4. Which of the following units is used to express concentration as a mass of solute per unit volume of solution?

• A. Molality (m)
• B. Molarity (M)
• C. Weight percent (%)
• D. Parts per million (ppm)

Correct answer: A

Rationale: Molality (m) is the unit used to express concentration as a mass of solute per unit volume of solution. It is calculated by dividing the mass of solute in grams by the mass of the solvent in kilograms. Molality is preferred over molarity when there are large temperature variations as it is temperature-independent, making it a more accurate measure of concentration. Molarity (B) is the unit used to express concentration as moles of solute per liter of solution, weight percent (C) is the mass of solute per 100 parts of the total mass of the solution, and parts per million (D) is used to express very small concentrations where 1 ppm is equivalent to 1 mg of solute per liter of solution.

5. Which of the following is an incomplete sentence?

• A. Watch out.
• B. In the rose garden out back.
• C. I guess that's true.
• D. It would take about three weeks.

Correct answer: B

Rationale: The correct answer is B: 'In the rose garden out back.' This is an incomplete sentence because it lacks a subject and a verb. A complete sentence requires both a subject (who or what the sentence is about) and a verb (action or state of being). Choices A, C, and D are complete sentences as they have the necessary components to form a grammatically correct sentence. 'Watch out' has an implied subject (you) and verb (watch), 'I guess that's true' has the subject 'I' and the verb 'guess', and 'It would take about three weeks' has the subject 'It' and the verb phrase 'would take.'

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