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Which cell organelle can be functionally compared to the door of a house?
- A. Nucleus.
- B. Endoplasmic reticulum.
- C. Cell membrane.
- D. Cytoplasm.
Correct Answer: C
Rationale:
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Which cellular appendage enables cells to move through their environments?
- A. Flagellum
- B. Cell membrane
- C. Transport protein
- D. Receptor
Correct Answer: A
Rationale: "Flagellum" is a whip-like appendage that allows certain cells to move through their environment.
Which of the following molecules are considered the most important in biology?
- 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: Carbohydrates, lipids, proteins, and nucleic acids are the four main types of molecules that are fundamental to biological systems. Carbohydrates provide energy, lipids are essential for cell structure and signaling, proteins carry out diverse functions in cells, and nucleic acids store and transfer genetic information. These molecules are considered the most important in biology due to their critical roles in various biological processes.
Which set is correctly listed for characteristic chromosome number, and most of their cells have a complete set of these chromosomes?
- A. Genus, order, species, phylum
- B. Order, phylum, species, genus
- C. Species, order, phylum, genus
- D. Phylum, order, genus, species
Correct Answer: D
Rationale: The correct order from largest to smallest is Phylum, Order, Genus, Species. In biological classification, the hierarchy of taxonomic ranks is structured such that phylum is the broadest category, followed by order, genus, and species, which is the most specific. When looking at the characteristic chromosome number, most cells have a complete set of chromosomes, and this order aligns with the genetic similarity and differences observed in organisms.
Epithelial cells are:
- A. Polarized
- B. Neutral
- C. Larger than other cells
- D. None of the above
Correct Answer: A
Rationale: Epithelial cells are polarized, meaning they have distinct structural and functional differences between their apical and basolateral surfaces. This polarity allows them to perform specialized functions efficiently. The statement that epithelial cells are larger than other cells is incorrect as cell size can vary across different cell types, and being larger is not a defining characteristic of epithelial cells.
Which is an example of the comet organizational hierarchy for a wolf?
- A. Muscle tissue, blood cell, DNA, organ, circulatory system, wolf.
- B. Circulatory system, DNA, muscle tissue, blood cell, heart, wolf.
- C. Blood cell, organ, circulatory system, muscle tissue, DNA, wolf.
- D. DNA, blood cell, muscle tissue, heart, circulatory system, wolf.
Correct Answer: D
Rationale: