HESI RN
Biology Practice Test
1. What is the composition of the cellular membrane?
- A. A bilayer of phospholipid molecules
- B. A single layer of phospholipid molecules
- C. Proteins that act as transport highways
- D. Carbohydrates
Correct answer: A
Rationale: The cellular membrane is primarily composed of a phospholipid bilayer, which consists of two layers of phospholipid molecules. These molecules have a hydrophilic (water-attracting) head and hydrophobic (water-repelling) tail, creating a barrier that separates the internal cellular environment from the external surroundings. While proteins are embedded within this bilayer and act as transport channels, receptors, and structural support, carbohydrates are found on the outer surface of the membrane for cell recognition and signaling purposes. Therefore, the correct answer is a bilayer of phospholipid molecules.
2. During a routine physical exam, a male adolescent client tells the nurse, 'sometimes, my mother gets angry because I want to be with my own friends.' What is the best initial response by the nurse?
- A. Offer reassurance that his mother's concern is normal
- B. Determine if his friends are engaged in unsafe behaviors
- C. Ask about the client's response to his mother's anger
- D. Offer to discuss his concerns with his mother
Correct answer: C
Rationale: When a client expresses concerns about family dynamics, it is important to explore their feelings and reactions to the situation. By asking about the client's response to his mother's anger, the nurse can gain insight into the client's emotions, thoughts, and coping mechanisms. Understanding these aspects is crucial in providing appropriate support and guidance. Option A is incorrect because it focuses solely on reassuring the client about his mother's concern without addressing the client's feelings. Option B assumes negative behaviors without evidence. Option D jumps to discussing concerns with the mother without understanding the client's perspective first.
3. A client on long-term corticosteroid therapy for rheumatoid arthritis presents with weakness and hypotension. What is the nurse's first action?
- A. Administer a PRN dose of corticosteroids.
- B. Place the client in a supine position.
- C. Encourage oral fluid intake.
- D. Review the client's recent medication history.
Correct answer: A
Rationale: Administering a PRN dose of corticosteroids is the correct first action when a client on long-term corticosteroid therapy presents with weakness and hypotension. In this scenario, the client is likely experiencing adrenal insufficiency due to prolonged corticosteroid use. Administering corticosteroids promptly can help correct this insufficiency and improve the client's symptoms. Placing the client in a supine position may be necessary for symptomatic hypotension, but addressing the root cause with corticosteroids is more crucial initially. Encouraging oral fluid intake is important for many conditions but is not the priority in this case. Reviewing the client's recent medication history can provide valuable information but is not the first action needed to address the client's current presentation.
4. In meiosis, the chromosome number is reduced from:
- A. 46 to 23
- B. 46 to 33
- C. 28 to 14
- D. 24 to 12
Correct answer: A
Rationale: The correct answer is A: "46 to 23." In meiosis, the chromosome number is reduced by half to form gametes for sexual reproduction. In humans, where the diploid chromosome number is 46, meiosis results in haploid cells with 23 chromosomes. Choices B, C, and D are incorrect because they do not represent the correct reduction in chromosome number during meiosis.
5. The nurse is caring for a patient who is ordered to receive PO trimethoprim-sulfamethoxazole (TMP-SMX) 160/800 QID to treat a urinary tract infection caused by E. coli. The nurse will contact the provider to clarify the correct
- A. dose.
- B. drug.
- C. frequency.
- D. route.
Correct answer: C
Rationale: The correct answer is 'frequency.' Trimethoprim-sulfamethoxazole (TMP-SMX) is typically prescribed to be taken twice daily, not four times a day (QID). The dose, drug, and route are already specified in the order, so the nurse should contact the provider to clarify the frequency of administration to ensure optimal treatment for the urinary tract infection caused by E. coli. Choosing 'dose' is incorrect because the dose of 160/800 is already provided in the order. 'Drug' is incorrect because the medication Trimethoprim-sulfamethoxazole (TMP-SMX) is explicitly stated in the prescription. 'Route' is incorrect as PO (by mouth) is also clearly indicated in the prescription.