Nursing Elites

1. Polymers are

• A. Large molecules formed by repeating units called monomers
• B. Simple organic molecules with low boiling points
• C. Highly reactive compounds used in industrial processes
• D. Insoluble solids with no definite structure

Correct answer: A

Rationale: The correct answer is A: 'Large molecules formed by repeating units called monomers.' Polymers are macromolecules made up of repeating units called monomers, which are linked together through chemical bonds. This repetition results in long chains or networks of molecules, giving polymers their unique properties. Options B, C, and D are incorrect because polymers are not simple organic molecules with low boiling points, highly reactive compounds used in industrial processes, or insoluble solids with no definite structure. Understanding the basic definition of polymers helps us appreciate their wide range of applications in materials science, engineering, and everyday products.

2. Which structure in the respiratory system serves as the "windpipe" that conducts air from the larynx to the bronchi?

• A. Trachea
• B. Larynx
• C. Bronchi
• D. Alveoli

Correct answer: A

Rationale: The correct answer is A: Trachea. The trachea, also known as the windpipe, is a tube-like structure in the respiratory system that connects the larynx to the bronchi. It serves as the main airway for the passage of air into and out of the lungs. The larynx is commonly known as the voice box and is responsible for producing sound. The bronchi are the two branches that stem from the trachea and lead to the lungs, where they further divide into smaller airways. The alveoli are tiny air sacs in the lungs where gas exchange occurs. Therefore, the trachea is the correct answer as it directly conducts air from the larynx to the bronchi.

3. What is the common name for the compound CH₃COOH?

• A. Acetic acid
• B. Formic acid
• C. Butyric acid
• D. Propionic acid

Correct answer: A

Rationale: CH₃COOH is commonly known as acetic acid. The other choices represent different organic acids.

4. The stratified cuboidal epithelium lining the salivary glands is responsible for:

• A. Protection
• B. Gas exchange
• C. Secretion
• D. Absorption

Correct answer: C

Rationale: The correct answer is C: Secretion. The stratified cuboidal epithelium lining the salivary glands is specifically designed for the secretion of saliva, which plays a crucial role in the initial digestion of food. This type of epithelium has multiple layers of cells that provide protection and support for the glandular tissue underneath, allowing for the production and release of saliva. Options A, B, and D are incorrect as they do not accurately reflect the primary function of this particular epithelium. Therefore, the correct choice is C, secretion.

5. What is the name of the cartilage flap that covers the trachea during swallowing, preventing food from entering the airway?

• A. Epiglottis
• B. Glottis
• C. Larynx
• D. Pharynx

Correct answer: A

Rationale: The correct answer is A: Epiglottis. The epiglottis is a cartilage flap located at the base of the tongue that covers the trachea during swallowing. Its main function is to prevent food or liquid from entering the airway and instead directs them towards the esophagus. The glottis (option B) is the space between the vocal cords in the larynx, not a cartilage flap. The larynx (option C) is the voice box located in the throat, and the pharynx (option D) is the throat cavity connecting the mouth and the esophagus. Understanding the role of the epiglottis in protecting the airway during swallowing is crucial for maintaining proper respiratory function.

6. Identify the reflexive pronoun in the sentence: "She prepared herself for the presentation."

• A. herself
• B. she
• C. presentation
• D. for

Correct answer: A

Rationale: "Herself" refers back to the subject "she," making it a reflexive pronoun.

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