what cell structure is responsible for efficiently packaging dna into a small volume to fit into the nucleus of a cell and protect the dna structure a
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Nursing Elites

HESI RN

Biology Test

1. What cell structure is responsible for efficiently packaging DNA into a small volume to fit into the nucleus of a cell and protect the DNA structure and sequence?

Correct answer: B

Rationale: Chromatin is the correct answer. Chromatin is responsible for packaging DNA into a more compact, dense structure to fit into the nucleus and protect the DNA. The Golgi apparatus is involved in processing and packaging proteins, not DNA. Smooth endoplasmic reticulum is involved in lipid metabolism and detoxification. Mitochondria are known as the powerhouse of the cell responsible for energy production, not DNA packaging.

2. Desmopressin acetate (DDAVP) is prescribed for the treatment of diabetes insipidus. The nurse monitors the client after medication administration for which therapeutic response?

Correct answer: A

Rationale: Desmopressin promotes renal conservation of water by increasing the permeability of kidney collecting ducts to water, resulting in decreased urinary output. Therefore, the therapeutic response expected after administering desmopressin for diabetes insipidus is a reduction in urinary output.

3. A healthcare provider has written a prescription for ranitidine (Zantac), once daily. When should the nurse schedule the medication?

Correct answer: A

Rationale: The correct answer is A: At bedtime. Ranitidine should be scheduled at bedtime because it provides a prolonged effect and offers the greatest protection of the gastric mucosa. Administering it at this time helps in managing nocturnal acid breakthrough and providing relief during the night.

4. A client has undergone insertion of a permanent pacemaker. When developing a discharge teaching plan, the nurse writes a goal of, 'The client will verbalize symptoms of pacemaker failure.' Which symptoms are most important to teach the client?

Correct answer: D

Rationale: The correct answer is 'D: Feelings of dizziness.' Feelings of dizziness may occur as a result of a decreased heart rate, leading to decreased cardiac output, which can be an indication of pacemaker failure. Teaching the client to recognize symptoms of decreased cardiac output, like dizziness, is crucial for early detection of pacemaker malfunction. Choices A, B, and C are less specific to pacemaker failure and are not commonly associated with this condition. Facial flushing, fever, and pounding headache are not typical signs of pacemaker failure and are not directly related to cardiac output, making them less relevant for teaching the client about pacemaker failure.

5. A nurse plans to call the healthcare provider to report an 0600 serum potassium level of 2 mEq/L or mmol/L (SI), but the charge nurse tells the nurse that the healthcare provider does not like to receive early morning calls and will make rounds later in the morning. What action should the nurse take?

Correct answer: A

Rationale: A nurse should contact the healthcare provider immediately to report a critically low potassium level of 2 mEq/L. Potassium levels below the normal range can lead to life-threatening complications such as cardiac arrhythmias. Prompt notification is essential to ensure timely intervention and prevent harm to the patient. Option B is incorrect as delaying reporting such a critical value can jeopardize patient safety. Option C is not the priority in this situation; the focus should be on patient care. Option D is dangerous and inappropriate as administering a potassium supplement without healthcare provider's guidance can be harmful, especially with a critically low level.

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