Nursing Elites

1. Which one is not a hydrocarbon?

• A. Methane (CH4)
• B. Pyridine (C5H5N)
• C. Ethane (C2H6)
• D. Propane (C3H8)

Correct answer: B

Rationale: The correct answer is B, Pyridine (C5H5N). Pyridine is not a hydrocarbon because it contains nitrogen (N) in its molecular structure, in addition to carbon (C) and hydrogen (H) atoms. Hydrocarbons consist solely of carbon and hydrogen atoms. Methane (CH4), ethane (C2H6), and propane (C3H8) are all examples of hydrocarbons as they only contain carbon and hydrogen atoms, making them organic compounds known for their combustion properties.

2. Select the word or phrase that makes this sentence grammatically correct: 'Theo was in great shape; he ____ all the way back to the pier.'

• A. swam
• B. swimmed
• C. swum
• D. swim

Correct answer: A

Rationale: In this sentence, the correct choice is 'swam,' which is the past tense of 'swim.' Therefore, 'swam' correctly completes the sentence: 'Theo was in great shape; he swam all the way back to the pier.' 'Swimmed' is not a valid past tense form of 'swim,' 'swum' is the past participle form and doesn't fit the context, and 'swim' is the base form of the verb and is not suitable in this case.

3. What is the purpose of phloem tissue in plant stems?

• A. It conducts water up through the stem.
• B. It conducts the energy of light to leaves.
• C. It conducts food throughout the plant.
• D. It conducts carbon dioxide throughout the plant.

Correct answer: C

Rationale: The purpose of phloem tissue in plant stems is to conduct food, particularly sugars produced in the leaves during photosynthesis, throughout the plant. The phloem transports these organic compounds to various parts of the plant where they are needed for growth and energy. Choice A is incorrect because water is primarily transported by xylem tissue, not phloem. Choice B is incorrect as the energy of light is captured by chlorophyll in the process of photosynthesis, not conducted by phloem. Choice D is incorrect because carbon dioxide is mainly absorbed through the leaves and transported to other parts of the plant through diffusion, not by phloem.

4. What is the role of platelets in the blood?

• A. To transport oxygen
• B. To fight infections
• C. To clot blood
• D. To carry nutrients

Correct answer: C

Rationale: Platelets, also known as thrombocytes, play a crucial role in blood clotting. When there is an injury, platelets adhere to the site and release substances that form a clot, preventing excessive bleeding. This function is vital for maintaining hemostasis and preventing blood loss. Choice A is incorrect because red blood cells, not platelets, are responsible for transporting oxygen. Choice B is incorrect as white blood cells are primarily responsible for fighting infections. Choice D is incorrect as nutrients are mainly transported by plasma and red blood cells, not platelets.

5. The student observed the tricky procedure with a certain amount of trepidation. What does trepidation mean?

• A. Confidence
• B. Misgivings
• C. Fear
• D. Doubt

Correct answer: B

Rationale: The correct answer is B: Misgivings. Trepidation means a feeling of fear or apprehension. In this context, the student observed the procedure with a certain amount of trepidation, indicating that they were feeling uneasy or fearful. Choices A, C, and D are incorrect. Confidence (choice A) is the opposite of trepidation, as it denotes a feeling of self-assurance. Fear (choice C) is the closest synonym to trepidation, making it an attractive distractor, but it is not the correct answer. Doubt (choice D) is different from trepidation, as doubt refers to a feeling of uncertainty or lack of conviction, not necessarily fear or apprehension.

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