Which of the following describes a characteristic of cancer cells?
Maintaining specialized cell functions
Loss of contact inhibition
Ability to repair DNA damage
Orderly cell cycle progression
The Correct Answer is B
A. Cancer cells typically lose their specialized functions and characteristics that normal cells have. This loss of differentiation is known as dedifferentiation, where cancer cells become less specialized and more primitive in nature. This allows them to proliferate rapidly and invade surrounding tissues.
B. Contact inhibition refers to the normal process where cells stop dividing when they come into contact with neighboring cells. In cancer cells, this mechanism is disrupted, leading to uncontrolled cell growth and proliferation. Cancer cells continue to divide and grow even when they are in close contact with other cells, which contributes to tumor formation and progression.
C. Cancer cells often acquire mutations that impair their ability to repair DNA damage effectively. This can lead to an accumulation of genetic mutations over time, which is a hallmark of cancer development. While some cancer cells may still have mechanisms to repair DNA damage, they are often less efficient compared to normal cells, leading to genomic instability and further mutation accumulation.
D. Normal cells follow a tightly regulated cell cycle with specific checkpoints that ensure orderly progression through phases such as G1, S, G2, and M phases. In contrast, cancer cells often have dysregulated cell cycle control. They may bypass checkpoints that normally control cell division, leading to uncontrolled proliferation and growth.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Headache is a common side effect of nitroglycerin due to its vasodilatory effects, especially in the head. Most headaches associated with nitroglycerin are mild and transient. Patients are generally advised to continue using the medication as prescribed unless the headache is severe or persistent.
B. Nitroglycerin tablets are used for the immediate relief of angina symptoms. If the first tablet does not adequately relieve chest pain within 5 minutes, the patient can take a second tablet. If the pain persists after the second tablet, emergency medical attention should be sought. However, it's important to note that the maximum number of tablets that can be taken within a short period should be specified by the healthcare provider, typically 2 or 3 tablets in 15 to 30 minutes.
C. Nitroglycerin can cause orthostatic hypotension, which is a drop in blood pressure upon standing up. This can lead to dizziness or fainting. Therefore, patients should be advised to stand up slowly after taking nitroglycerin to minimize the risk of falls or injury.
D. Nitroglycerin tablets are sensitive to light, heat, and moisture, which can reduce their effectiveness over time. Therefore, it's recommended to replace nitroglycerin tablets every 3 to 6 months to ensure potency and effectiveness.
Correct Answer is B
Explanation
A. Whole milk contains saturated fats, which can contribute to overall cardiovascular health risks. However, it's not directly linked to causing PACs. While reducing saturated fat intake is generally beneficial for heart health, whole milk alone might not significantly exacerbate PACs compared to other dietary factors.
B. Black tea contains caffeine, which is a stimulant that can potentially increase heart rate and trigger PACs or other irregular heart rhythms in sensitive individuals. Therefore, black tea is a consideration for clients with PACs as it can be a potential trigger.
C. Bacon is high in saturated fat and sodium, which can contribute to cardiovascular risks and overall heart health concerns. High-fat foods like bacon can indirectly influence heart rhythms, but there's not a direct correlation between consuming bacon and PACs.
D. Eggs and cheese are high in saturated fats and cholesterol, which can impact cardiovascular health. While not directly linked to causing PACs, the high-fat content of scrambled eggs with cheese may contribute to overall heart health concerns.
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