Nokea
Which disease is caused by a bacterium?
- A. AIDS (HIV).
- B. Strep throat.
- C. Mumps.
- D. Common cold.
Correct Answer: B
Rationale:
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Which type of cells possess a cell membrane?
- A. Prokaryotic cells only
- B. Eukaryotic cells only
- C. Both prokaryotic and eukaryotic cells
- D. None of the above
Correct Answer: C
Rationale: The cell membrane is a fundamental structure found in all cells, serving as a protective barrier and regulating the passage of substances in and out of the cell. Therefore, both prokaryotic and eukaryotic cells have a cell membrane. This makes option C the correct choice.
Which term means a group of similar cells combined to perform a common function?
- A. Tissue
- B. System.
- C. Organism.
- D. Organ.
Correct Answer: A
Rationale:
Of all the molecules that are significant to biology, which of the following are considered the most important?
- A. Carbohydrates, lipids, protein, and nucleic acids
- B. Carbohydrates, lipids, protein, and calcium
- C. Carbohydrates, lipids, protein, and sulfur
- D. Carbohydrates, lipids, protein, and iron
Correct Answer: A
Rationale: The correct answer is A: Carbohydrates, lipids, proteins, and nucleic acids are considered the most important molecules in biology. Carbohydrates are essential for energy production, lipids play a role in energy storage and cell membrane structure, proteins are involved in various cellular functions, and nucleic acids carry genetic information. While calcium, sulfur, and iron are important elements in biology, they are not considered as primary biological molecules compared to carbohydrates, lipids, proteins, and nucleic acids.
What is the function of water in photosynthesis?
- A. Combining with carbon dioxide
- B. Absorbing light energy
- C. Supplying electrons in the light reactions
- D. Transporting hydrogen ions in the dark reactions
Correct Answer: C
Rationale: Water is crucial in photosynthesis as it provides electrons during the light reactions. When water molecules are split in the light-dependent reactions, oxygen is released, and electrons are transferred to photosystem II to initiate the electron transport chain. This process is vital for the production of ATP and NADPH, which are necessary for the Calvin cycle to synthesize sugars.
What is the function of water in photosynthesis?
- A. Combine with carbon dioxide
- B. Absorb light energy
- C. Supply electrons in the light reactions
- D. Transport hydrogen ions in the dark reactions
Correct Answer: C
Rationale: Water plays a crucial role in photosynthesis by supplying electrons in the light reactions of the process. During the light reactions of photosynthesis, water molecules are split, releasing oxygen and providing electrons that are used to drive the production of energy-rich molecules like ATP and NADPH. This electron transfer process is essential for converting light energy into chemical energy, which is then used in the subsequent steps of photosynthesis to produce glucose and other organic compounds.