Nokea
What type of bond in the base of the DNA nucleotides holds the strands together?
- A. Hydrogen.
- B. Sodium chloride.
- C. Copper.
- D. Potassium bromide.
Correct Answer: A
Rationale:
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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 statement is an inference related to scientific methodology?
- A. Flowers open in the sun.
- B. Homosapiens use tools.
- C. The skin is yellow.
- D. Nutrients are needed for growth.
Correct Answer: D
Rationale: Correct Answer: D
Rationale:
1. Inference: Nutrients are needed for growth implies a scientific methodology (cause and effect relationship).
2. This statement is based on scientific evidence and experimentation.
3. It aligns with the fundamental principles of biology and nutrition.
4. It demonstrates the importance of empirical evidence in scientific research.
Summary:
Choice D is correct as it directly relates to a fundamental aspect of scientific methodology by establishing a causal relationship based on evidence. Choices A, B, and C lack the scientific methodology aspect and do not involve an inference based on empirical evidence.
Why is homeostasis necessary?
- A. It maintains temperature.
- B. It maintains pH.
- C. It maintains glucose levels.
- D. All of the above.
Correct Answer: D
Rationale: Homeostasis is essential for maintaining the internal balance and stability of the body. It regulates various factors, such as temperature, pH levels, and glucose levels, to ensure optimal physiological function. Therefore, all the choices (temperature, pH, and glucose levels) are correct as they are all essential components of homeostasis, working together to keep the body's internal environment stable and functioning properly.
Human cells need oxygen for respiration. What system of the body is responsible for transporting an oxygen molecule to different locations throughout the body?
- A. Skeletal.
- B. Lymphatic.
- C. Respiratory.
- D. Circulatory.
Correct Answer: D
Rationale:
What structure enables sperm cells to move effectively?
- A. Centriole
- B. Cilium
- C. Centrosome
- D. Flagellum
Correct Answer: D
Rationale: The flagellum is a whip-like structure that is crucial for sperm cells to swim and move effectively. It provides the necessary motility for sperm, allowing them to navigate through the female reproductive tract to reach the egg for fertilization. In contrast, structures like centriole, cilium, and centrosome do not have the propelling ability required for sperm cell movement.