Nokea
Why is DNA important for metabolic activities of the cell?
- A. It initiates cellular mitosis.
- B. It provides cell wall stability.
- C. It increases glucose absorption.
- D. It controls the synthesis of enzymes.
Correct Answer: D
Rationale: DNA is crucial for metabolic activities as it contains the genetic information needed for the synthesis of enzymes, which are essential for various metabolic reactions within the cell. Enzymes are biological catalysts that regulate and speed up chemical reactions, allowing the cell to carry out necessary metabolic processes efficiently. Therefore, DNA's role in controlling enzyme synthesis directly impacts the cell's metabolic activities, making option D the correct answer.
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Which genetic descriptor refers to an organism's actual appearance?
- A. Phenotype
- B. Genotype
- C. Homozygote
- D. Karyotype
Correct Answer: A
Rationale: Phenotype refers to the observable characteristics or traits of an organism, including physical appearance, behavior, and physiological properties. It is influenced by the organism's genotype and environmental factors. Genotype, on the other hand, represents the genetic makeup of an organism, while homozygote refers to an individual having two identical alleles for a particular gene. Karyotype, on the other hand, refers to the complete set of chromosomes in an individual.
Which organelle is responsible for protein synthesis?
- A. Ribosome
- B. Chloroplast
- C. Lysosome
- D. Mitochondria
Correct Answer: A
Rationale: The correct answer is A, Ribosome. Ribosomes are the organelles responsible for protein synthesis in a cell. They are the site where amino acids are assembled into proteins based on the genetic information carried by mRNA. Chloroplasts are responsible for photosynthesis in plant cells, Lysosomes contain enzymes for digestion and waste removal, and Mitochondria are known as the powerhouse of the cell, responsible for generating energy.
Which of the following statements about antibiotics is incorrect?
- A. They can interfere with the bacteria's ability to survive.
- B. They can affect how bacteria multiply.
- C. They can cause more bacteria to grow.
- D. They only work on bacteria.
Correct Answer: C
Rationale: Antibiotics are medications designed to inhibit or kill bacteria. Options A and B are true statements about antibiotics, as they interfere with bacteria's ability to survive and affect their multiplication. However, antibiotics do not cause more bacteria to grow; instead, they aim to decrease bacterial growth by killing or inhibiting them. Therefore, the statement in option C is incorrect, making it the correct answer.
Why doesn't an antibiotic work for treating flu symptoms in a patient?
- A. The antibiotic is for a different type of infection, not the flu.
- B. The antibiotic is not effective in treating viral infections like the flu.
- C. The antibiotic is not administered in a sufficient dosage to combat the flu.
- D. None of the above
Correct Answer: B
Rationale: Antibiotics are designed to treat bacterial infections, not viral infections like the flu. The flu is caused by a virus, so antibiotics are ineffective in treating flu symptoms. To effectively manage and treat flu cases, antiviral medications specifically designed to target viral infections should be used.
Animals are composed primarily of what type of cell?
- A. Simple.
- B. Prokaryotic.
- C. Bacterial.
- D. Eukaryotic.
Correct Answer: D
Rationale: