Nokea
Why is homeostasis necessary?
- A. To maintain temperature
- B. To maintain pH
- C. To maintain glucose levels
- D. All of the above
Correct Answer: D
Rationale: Homeostasis is essential for the body to maintain internal balance and ensure optimal functioning. It is responsible for regulating temperature to prevent overheating or cooling, controlling pH levels to support biochemical reactions, and managing glucose levels for energy production. Therefore, all the options - maintaining temperature, pH, and glucose levels - are crucial functions of homeostasis.
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Which of the following describes how a bacterium reproduces?
- A. Mitosis
- B. Meiosis
- C. Binary fission
- D. Cytokinesis
Correct Answer: C
Rationale: Binary fission is the correct answer. Bacteria reproduce asexually through binary fission, where a single cell divides into two identical daughter cells. Mitosis and meiosis are processes that occur in eukaryotic cells, not bacteria. Cytokinesis is the physical division of the cytoplasm that follows nuclear division, which is a part of the cell cycle in both eukaryotic and prokaryotic cells but not specific to bacterial reproduction.
Where can epithelial tissue be found?
- A. Organ linings
- B. Heart muscle
- C. Tendons
- D. Spinal cord
Correct Answer: A
Rationale: Epithelial tissue is a type of tissue that covers the surfaces of the body, inside and out. It forms the lining of various organs such as the skin, respiratory tract, gastrointestinal tract, and more. Therefore, epithelial tissue can be found in organ linings, making choice A the correct answer.
What is the typical result of mitosis in humans?
- A. two diploid cells
- B. two haploid cells
- C. four diploid cells
- D. four haploid cells
Correct Answer: A
Rationale: During mitosis, a cell divides to produce two identical daughter cells that are genetically identical to the parent cell. These daughter cells are diploid, meaning they contain the full set of chromosomes. Therefore, the typical result of mitosis in humans is the formation of two diploid cells (Choice A). Choices B, C, and D are incorrect as mitosis results in the production of diploid cells, not haploid cells, and typically, it results in two daughter cells, not four.
What type of cell primarily makes up animals?
- A. Eukaryotic
- B. Simple
- C. Prokaryotic
- D. Bacterial
Correct Answer: A
Rationale: Animals are composed primarily of eukaryotic cells, characterized by a defined nucleus and membrane-bound organelles. Eukaryotic cells are complex and serve as the basis for multicellular organisms such as animals, contrasting with prokaryotic cells that lack a defined nucleus and organelles.
Why do cells need to use exocytosis?
- A. To obtain energy
- B. To defend against invaders
- C. To eliminate waste
- D. To undergo cell division
Correct Answer: C
Rationale: Cells use exocytosis to eliminate waste from the cell. Exocytosis is the process by which cells expel waste materials or products outside the cell. This process helps maintain cellular cleanliness and proper functioning by preventing the accumulation of harmful substances inside the cell, ensuring the cell's health and survival.