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. During the summer, a local health department reports a sudden rise in cases of West Nile virus in the community. Which epidemiological term best describes this event? Select one:
- Pathogenic
- Endemic
- Epidemic
- Pandemic
Explanation
Explanation of Correct Answer: c. Epidemic: An epidemic refers to the sudden and significant increase in the number of cases of a disease within a specific population, area, or community over a short period of time. In this scenario, the unexpected rise in West Nile virus cases in one community fits the definition of an epidemic because the disease occurrence exceeds the normal expected rate.
2. Which organelles in the cell synthesize protein? Select one:
- Endoplasmic reticulum
- Ribosomes
- Plasma membrane
- Mitochondria
Explanation
Explanation of Correct Answer: b. Ribosomes: Ribosomes are the cellular structures responsible for protein synthesis. They read messenger RNA (mRNA) sequences and translate them into chains of amino acids, forming proteins. Ribosomes can be found floating freely in the cytoplasm, where they make proteins for internal cell use, or attached to the rough endoplasmic reticulum, where they produce proteins destined for secretion or membrane incorporation.
3. The nurse recognizes that a solution with a pH of 2 is: Select one:
- Slightly alkaline
- Slightly acidic
- Strongly acidic
- Strongly alkaline
Explanation
Explanation of Correct Answer: c. Strongly acidic: The pH scale ranges from 0 to 14, with 7 being neutral. Values below 7 indicate acidity, while values above 7 indicate alkalinity. A pH of 2 is very low, meaning the hydrogen ion concentration is high, making the solution strongly acidic. Examples include stomach acid and certain industrial chemicals, which can corrode tissues or materials due to their high acidity.
4. Which body cavity contains the reproductive organs? Select one:
- Abdominal
- Pelvic
- Spinal
- Thoracic
Explanation
Explanation of Correct Answer: b. Pelvic: The pelvic cavity is located below the abdominal cavity and contains the reproductive organs, urinary bladder, and part of the large intestine. In females, it includes the uterus, ovaries, and fallopian tubes; in males, it contains the prostate gland and seminal vesicles. This cavity provides protection and structural support for organs involved in reproduction and excretion.
5. A patient with influenza sneezes in a crowded waiting room. Several other patients later develop flu symptoms. Which part of the chain of infection is represented by the sneeze? Select one:
- Portal of entry
- Susceptible host
- Portal of exit
- Reservoir
Explanation
Explanation of Correct Answer: c. Portal of exit: The portal of exit is the route through which infectious agents leave the reservoir (the infected person) to spread to others. In this scenario, when the patient sneezes, respiratory droplets containing the influenza virus are expelled from the nose and mouth into the air, allowing transmission to occur. The sneeze provides the means for pathogens to exit and infect new hosts.
6. The nursing student knows that the building blocks of protein are: Select one:
- Amino acids
- Fatty acids
- Carbonic acid
- Hydrochloric acid
Explanation
Explanation of Correct Answer: a. Amino acids: Proteins are made up of smaller units called amino acids, which link together through peptide bonds to form long chains known as polypeptides. There are 20 standard amino acids, and their specific sequence determines the protein’s structure and function. Proteins play vital roles in body processes such as tissue repair, enzyme activity, and immune response. Without amino acids, protein synthesis cannot occur.
7. A nurse is caring for a client with a wound infection. The healthcare provider has ordered a wound culture which the LPN has collected and sent to the lab. In order to ensure the correct antibiotics are being given, the LPN knows the additional testing performed in the lab is called: Select one:
- Sensitivity
- Virulence
- Anaerobe
- Prokaryotic
Explanation
Explanation of Correct Answer: A sensitivity test (also known as an antibiotic susceptibility test) determines which antibiotics are most effective against the bacteria isolated from the wound culture. This ensures the healthcare provider selects the most appropriate antibiotic to treat the infection. Sensitivity testing is a crucial step in combating antibiotic resistance and promoting targeted therapy, leading to faster healing and reduced complications.
8. An older adult patient receiving chemotherapy develops oral thrush (candidiasis). This is an example of what type of infection? Select one:
- Endemic
- Opportunistic
- Bacterial
- Viral
Explanation
Explanation of Correct Answer: b. Opportunistic: An opportunistic infection occurs when normally harmless microorganisms take advantage of a weakened immune system. In this case, oral thrush (candidiasis) is caused by the fungus Candida albicans, which is usually present in the mouth without causing problems. However, chemotherapy suppresses the immune system, reducing the body’s ability to control fungal growth. This allows Candida to multiply, leading to infection.
9. 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.
10. Which organelle is involved in generating energy for the cell? Select one:
- Mitochondria
- Endoplasmic reticulum
- Nucleus
- Ribosomes
Explanation
Explanation of Correct Answer: a. Mitochondria: The mitochondria are known as the “powerhouse” of the cell. They generate energy in the form of adenosine triphosphate (ATP) through a process called cellular respiration. Glucose and oxygen are converted into ATP, which fuels essential cellular processes such as muscle contraction, nerve signaling, and protein synthesis. Cells that require more energy, like muscle cells, contain a higher number of mitochondria.
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