Scientific Foundation 2025-2026 at New York Online Electtonic Library
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Free Scientific Foundation 2025-2026 at New York Online Electtonic Library Questions
1. A nurse cleans a patient's skin with an alcohol wipe before administering an IM injection. What type of infection control method is this? Select one:
- Sterilization
- Using an antiseptic (antisepsis)
- Disinfection
- Surgical asepsis
Explanation
Explanation of Correct Answer: b. Using an antiseptic (antisepsis): Antisepsis is the process of using chemical agents, such as alcohol, on living tissue to reduce or eliminate microorganisms and prevent infection. When a nurse cleans the skin with an alcohol wipe before an intramuscular (IM) injection, the goal is to remove surface bacteria and lower infection risk at the injection site. Antiseptics are safe for skin use and are an essential part of standard nursing practice for injections and minor procedures.
2. The LPN student has been assigned to care for a patient who was admitted for pancreatitis. The LPN student knows the pancreas is located in the ________ assessment area when auscultating and palpating in this area, and the patient may exhibit discomfort during the abdominal exam. Select one:
- Left upper quadrant
- Right lower quadrant
- Right upper quadrant
- Left lower quadrant
Explanation
Explanation of Correct Answer: a. Left upper quadrant: The pancreas lies mostly in the left upper quadrant (LUQ) of the abdomen, extending horizontally behind the stomach and partly into the midline. In pancreatitis, inflammation of this organ often causes pain and tenderness in the LUQ or epigastric region, sometimes radiating to the back. During assessment, the nurse may note guarding or discomfort when palpating this area due to irritation and inflammation of pancreatic tissue.
3. The LPN student has studied mitosis. They have learned the stages of mitosis and what happens in each phase. Which of the following things are taking place in prophase? (Select all that apply.)
- Chromosomes get thicker and shorter
- Chromosomes separate and move to opposite sides of the cell
- Centrioles move to opposite sides of the cell and start to create spindle fibers
- DNA replication takes place
- Nucleolus and nuclear membrane start to disappear
- Chromosomes line up across the center of the cell and attach to spindle fibers
Explanation
Explanation of Each Correct Answer: a. Chromosomes get thicker and shorter: During prophase, chromatin (the loose form of DNA) condenses into visible chromosomes. Each chromosome has already duplicated during interphase and now consists of two sister chromatids joined by a centromere. This condensation makes chromosomes thicker and shorter, allowing them to be easily separated later in mitosis. c. Centrioles move to opposite sides of the cell and start to create spindle fibers: Also in prophase, the centrioles migrate to opposite poles of the cell. As they move, they begin forming spindle fibers—microtubule structures that will attach to chromosomes and help guide their movement during later stages of mitosis (especially metaphase and anaphase). e. Nucleolus and nuclear membrane start to disappear: As prophase progresses, the nuclear envelope (membrane) and nucleolus begin to disintegrate, allowing the spindle fibers to interact directly with the chromosomes in preparation for metaphase.
4. Which element carries oxygen in red blood cells? Select one:
- Iodine
- Carbon
- Calcium
- Iron
Explanation
Explanation of Correct Answer: d. Iron: Iron is the essential element in hemoglobin, the protein in red blood cells that binds to oxygen. Each hemoglobin molecule contains four iron atoms that form reversible bonds with oxygen molecules, allowing red blood cells to transport oxygen from the lungs to tissues and return carbon dioxide to the lungs for exhalation. Without adequate iron, oxygen delivery in the body is impaired, leading to anemia and fatigue.
5. Cellular respiration is an intracellular, catabolic process taking place to produce energy. The LPN student has learned a simplified equation for this process. What are the components needed for ATP to be produced? Select one:
- Glucose and carbon dioxide
- Glucose and oxygen
- H₂O and sugar
- Water and carbon dioxide
Explanation
Explanation of Correct Answer: b. Glucose and oxygen: Cellular respiration is the process by which cells generate ATP (energy) by breaking down glucose in the presence of oxygen. The simplified equation is: Glucose + Oxygen → Carbon dioxide + Water + ATP. In this process, glucose provides the fuel, and oxygen acts as the oxidizing agent, allowing efficient energy release. This occurs primarily in the mitochondria, which are known as the “powerhouses” of the cell.
6. What is the function of the nucleolus? Select one:
- Releases enzymes
- Contains chromosomes
- Makes ribosomes
- Aids in cell respiration
Explanation
Explanation of Correct Answer: c. Makes ribosomes: The nucleolus is a dense, spherical structure located inside the nucleus of a cell. Its primary function is to produce and assemble ribosomal RNA (rRNA) and combine it with proteins to form the subunits of ribosomes. These subunits then leave the nucleus and enter the cytoplasm, where they play a crucial role in protein synthesis. The nucleolus is essential for the cell’s ability to produce proteins, which are vital for growth and repair.
7. Which muscle separates the ventral cavity into two parts? Select one:
- Latissimus dorsi
- Pectoralis major
- Diaphragm
- Intercostals
Explanation
Explanation of Correct Answer: c. Diaphragm: The diaphragm is a dome-shaped sheet of muscle that separates the thoracic cavity (containing the heart and lungs) from the abdominopelvic cavity (containing digestive and reproductive organs). It plays a vital role in respiration—when the diaphragm contracts, it flattens and increases the thoracic cavity’s volume, allowing air to flow into the lungs. It is the key muscle dividing the ventral cavity into its upper and lower sections.
8. Which of the following is most important in keeping the pH of a solution within a narrow range in the body? Select one:
- Salt
- Acid
- Buffer
- Base
Explanation
Explanation of Correct Answer: c. Buffer: A buffer is a chemical system that helps maintain the pH of body fluids within a narrow, stable range—typically between 7.35 and 7.45 in blood. Buffers work by neutralizing small amounts of added acid (H⁺ ions) or base (OH⁻ ions). The major buffer systems in the body include the bicarbonate, phosphate, and protein buffer systems, which prevent harmful pH fluctuations that could disrupt enzyme activity and cellular function.
9. What is the "building up" process from simple substances to complex ones called? Select one:
- Homeostasis
- Catabolism
- Anabolism
- Decomposition
Explanation
Explanation of Correct Answer: c. Anabolism: Anabolism is the constructive phase of metabolism in which smaller, simpler molecules (such as amino acids and sugars) are combined to form larger, more complex compounds (like proteins and glycogen). This process requires energy, usually in the form of ATP, and is essential for cell growth, tissue repair, and the synthesis of enzymes and hormones.
10. After a patient with C. difficile is discharged, the nurse wipes down the bed rails, call light, and bedside table with a bleach-based solution. Which infection control method is being used? Select one:
- Disinfection
- Sterilization
- Surgical asepsis
- Use of antiseptic (antisepsis)
Explanation
Explanation of Correct Answer: a. Disinfection: Disinfection is the process of using chemical agents—such as bleach—to destroy most pathogenic microorganisms on non-living surfaces. It is especially important after caring for patients with Clostridioides difficile (C. diff), as the spores are resistant to many cleaning agents. Bleach-based solutions effectively kill these spores and prevent transmission to future patients.
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