HESI A2 Biology Version 3
Practice exam for HESI A2 under Pre-Nursing (Nursing Exams). 5 sample questions.
Sample Questions
You're viewing a limited preview. Log in and subscribe to access all questions.
Log InExam Questions
Question 1
Why doesn't an antibiotic work for treating the flu symptoms in a patient?
Correct Answer: B
Rationale: Antibiotics are effective against bacterial infections, not viral infections like the flu. Influenza is caused by a virus, and antibiotics do not work against viruses. Using antibiotics inappropriately, such as for viral infections, can lead to antibiotic resistance and other adverse effects. Therefore, it is important to use antibiotics only when prescribed by a healthcare professional for bacterial infections.
Rationale: Antibiotics are effective against bacterial infections, not viral infections like the flu. Influenza is caused by a virus, and antibiotics do not work against viruses. Using antibiotics inappropriately, such as for viral infections, can lead to antibiotic resistance and other adverse effects. Therefore, it is important to use antibiotics only when prescribed by a healthcare professional for bacterial infections.
Question 2
Why is the nucleus important in a cell?
Correct Answer: A
Rationale: The correct answer is A. The nucleus is crucial in a cell because it stores the DNA, which contains the genetic information necessary for directing the cell's activities and determining its characteristics. The nucleus does not provide structural support, synthesize proteins, or produce energy from food; these functions are carried out by other cell organelles. Therefore, the main role of the nucleus is to safeguard and regulate the genetic material of the cell, ensuring proper cell function and inheritance of traits.
Rationale: The correct answer is A. The nucleus is crucial in a cell because it stores the DNA, which contains the genetic information necessary for directing the cell's activities and determining its characteristics. The nucleus does not provide structural support, synthesize proteins, or produce energy from food; these functions are carried out by other cell organelles. Therefore, the main role of the nucleus is to safeguard and regulate the genetic material of the cell, ensuring proper cell function and inheritance of traits.
Question 3
Why does cellular respiration occur?
Correct Answer: C
Rationale: Cellular respiration is the metabolic process in which cells convert nutrients, such as glucose, into energy in the form of ATP (adenosine triphosphate). This energy is crucial for the cell to perform its various functions and maintain life processes. Options A, B, and D do not accurately describe the purpose of cellular respiration, which is primarily about energy production to support cellular activities.
Rationale: Cellular respiration is the metabolic process in which cells convert nutrients, such as glucose, into energy in the form of ATP (adenosine triphosphate). This energy is crucial for the cell to perform its various functions and maintain life processes. Options A, B, and D do not accurately describe the purpose of cellular respiration, which is primarily about energy production to support cellular activities.
Question 4
Anaerobic respiration happens in.............because..............
Correct Answer: C
Rationale: Anaerobic respiration occurs in bacteria because they live in environments with low oxygen levels. In the absence of oxygen, these organisms utilize anaerobic respiration to generate energy. Animals and plants primarily rely on aerobic respiration, which requires oxygen to produce energy efficiently. Plants do not lack sunlight; they can perform photosynthesis to derive energy. Animals do require energy but predominantly use aerobic respiration when oxygen is available.
Rationale: Anaerobic respiration occurs in bacteria because they live in environments with low oxygen levels. In the absence of oxygen, these organisms utilize anaerobic respiration to generate energy. Animals and plants primarily rely on aerobic respiration, which requires oxygen to produce energy efficiently. Plants do not lack sunlight; they can perform photosynthesis to derive energy. Animals do require energy but predominantly use aerobic respiration when oxygen is available.
Question 5
Do all bacteria have negative effects and cause infections?
Correct Answer: B
Rationale: Not all bacteria have negative effects and cause infections. While some bacteria can lead to infections, many bacteria are beneficial and essential for various processes in nature and our bodies. Bacteria have diverse roles in ecosystems, including positive impacts like aiding digestion and nutrient recycling. Understanding the balance of beneficial and harmful bacteria is crucial for appreciating their significance in our lives.
Rationale: Not all bacteria have negative effects and cause infections. While some bacteria can lead to infections, many bacteria are beneficial and essential for various processes in nature and our bodies. Bacteria have diverse roles in ecosystems, including positive impacts like aiding digestion and nutrient recycling. Understanding the balance of beneficial and harmful bacteria is crucial for appreciating their significance in our lives.