1. Why doesn't an antibiotic work for treating the flu symptoms in a patient?
A. The antibiotic is for a different type of infection.
B. The antibiotic is not effective against the flu virus. Correct
C. The antibiotic is not administered in a sufficient dosage to combat the flu.
D. None of the above
Explanation
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.
2. Why is the nucleus important in a cell?
A. It stores the DNA. Correct
B. It provides structural support.
C. It synthesizes proteins.
D. It produces energy from food.
Explanation
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.
3. Why does cellular respiration occur?
A. Cells can copy DNA
B. Cells can breathe
C. Cells can convert nutrients to energy Correct
D. Cells can divide
Explanation
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.
4. Anaerobic respiration happens in.............because..............
A. Animals; they primarily rely on aerobic respiration
B. Plants; they can perform photosynthesis
C. Bacteria; they live in environments with low oxygen levels Correct
D. None of the above
Explanation
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.
5. Do all bacteria have negative effects and cause infections?
A. TRUE
B. FALSE Correct
C. Sometimes
D. Not sure
Explanation
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.