Nursing Elites

1. What is the term for the small air sacs in the lungs where gas exchange (oxygen and carbon dioxide) takes place?

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

Correct answer: B

Rationale: The correct answer is B: Alveoli. The alveoli are the small air sacs in the lungs where gas exchange occurs. Oxygen from the air we breathe passes into the bloodstream through the alveoli, while carbon dioxide from the bloodstream passes out of the body through the alveoli. Choice A, Bronchi, are the main airways in the lungs and not the site of gas exchange. Choice C, Trachea, refers to the windpipe, which is a different structure than the alveoli. Choice D, Bronchioles, are smaller airways branching off from the bronchi and are not where gas exchange primarily occurs.

2. What is the structure that attaches to each chromosome during mitosis?

• A. Centromere
• B. Telomere
• C. Spindle apparatus
• D. Nucleolus

Correct answer: A

Rationale: The correct answer is the centromere. It is the structure that attaches to each chromosome during mitosis. The centromere serves as the attachment point for spindle fibers during cell division, ensuring proper distribution of chromosomes to daughter cells. Telomeres are found at the ends of chromosomes, providing protection and stability. The spindle apparatus is responsible for separating chromosomes during cell division. The nucleolus, located within the nucleus, is involved in ribosomal RNA synthesis and not in chromosome attachment during mitosis.

3. What determines the final velocity of a block sliding down a frictionless inclined plane?

• A. The length of the incline
• B. The angle of the incline
• C. The mass of the block
• D. All of the above

Correct answer: B

Rationale: The final velocity of a block sliding down a frictionless inclined plane is determined by the angle of the incline. The angle directly impacts the acceleration of the block, affecting the final velocity it attains at the bottom. The length of the incline and the mass of the block do not play a direct role in determining the final velocity. Therefore, the correct answer is the angle of the incline (Choice B). Choices A and C are incorrect because the length of the incline and the mass of the block do not have a direct influence on the final velocity of the block in this scenario.

4. Which gland in the endocrine system is responsible for the production of red blood cells?

• A. Pituitary gland
• B. Thyroid gland
• C. Thymus gland
• D. None of the above

Correct answer: D

Rationale: Red blood cells are not produced by any of the glands listed in the options. Instead, red blood cells are produced in the bone marrow. The pituitary gland is known as the 'master gland' and controls several other endocrine glands but is not responsible for red blood cell production. The thyroid gland regulates metabolism and growth, not red blood cell production. The thymus gland is responsible for the production of T-cells, which are a type of white blood cell involved in the immune response. The parathyroid gland regulates calcium levels in the body, not red blood cell production. Therefore, none of the glands listed are responsible for the production of red blood cells.

5. Which of the following biological macromolecules is non-soluble, composed of hydrocarbons, and acts as an important source of energy storage for the body?

• A. carbohydrates
• B. nucleic acids
• C. lipids
• D. proteins

Correct answer: C

Rationale: Lipids are non-soluble biological macromolecules composed mostly of hydrocarbons such as fatty acids. They act as an essential source of energy storage for the body, providing efficient storage of energy in the form of fats. Carbohydrates are also an energy source for the body, but lipids excel in long-term energy storage. Nucleic acids are not known for energy storage; instead, they are involved in genetic information transmission and protein synthesis. Proteins play diverse roles in the body, such as enzymatic functions, structural support, and immune response, but they are not primarily known as a source of energy storage.

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