Nokea
Which of the following organisms would not have eukaryotic cells?
- A. Bacteria
- B. Dog
- C. Human
- D. Onion
Correct Answer: A
Rationale: The correct answer is A, Bacteria. Bacteria are prokaryotic organisms, meaning they lack a true nucleus and membrane-bound organelles, unlike eukaryotic cells found in dogs, humans, and onions. Dogs, humans, and onions are examples of organisms with eukaryotic cells that contain a true nucleus and various membrane-bound organelles.
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The cell membrane consists of a bilayer of phospholipids with proteins, cholesterol, and glycoproteins. This bilayer creates a hydrophobic region between two layers of lipids, making it which of the following?
- A. Impermeable
- B. Permeable
- C. Selectively permeable
- D. Selectively impermeable
Correct Answer: C
Rationale: The cell membrane is composed of a phospholipid bilayer with proteins, cholesterol, and glycoproteins. This structure results in the creation of a hydrophobic region between the lipid layers. The cell membrane is termed 'selectively permeable' because it allows certain substances to pass through while restricting the passage of others, based on factors like size and charge. This property is essential for regulating the transport of ions and molecules in and out of the cell to maintain cellular function and homeostasis.
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.
Which antioxidant is identified as a healing vitamin?
- A. A
- B. D.
- C. K
- D. E
Correct Answer: D
Rationale:
A hypertonic solution has what concentration of solutes compared to the cell?
- A. Same.
- B. Negative.
- C. Lower.
- D. Higher.
Correct Answer: D
Rationale:
In binomial nomenclature, what is the second part of an organismÄ€™s scientific name?
- A. species
- B. phylum
- C. population
- D. kingdom
Correct Answer: A
Rationale: In binomial nomenclature, the scientific name of an organism consists of two parts: the genus name (first part) and the species name (second part). The second part, 'species,' helps differentiate between different organisms within the same genus. This specific naming system is critical for accurate identification and classification of organisms. Hence, the correct answer is 'species.'