Nokea
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.
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Why is the nucleus important in a cell?
- A. It stores the DNA.
- B. It provides structural support.
- C. It synthesizes proteins.
- D. It produces energy from food.
Correct Answer: A
Rationale: The correct answer is A. The nucleus is crucial in a cell because it stores the DNA, which contains the genetic information necessary for directing the cell's activities and determining its characteristics. The nucleus does not provide structural support, synthesize proteins, or produce energy from food; these functions are carried out by other cell organelles. Therefore, the main role of the nucleus is to safeguard and regulate the genetic material of the cell, ensuring proper cell function and inheritance of traits.
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:
Many control, both positive and negative, maintain body processes. What is this phenomenon called?
- A. Homeostasis.
- B. Endothermy.
- C. Metabolism.
- D. Respiration.
Correct Answer: A
Rationale: Correct Answer: A: Homeostasis.
Rationale:
1. Homeostasis refers to the ability of the body to maintain internal stability despite external changes.
2. It involves various control mechanisms to keep key physiological parameters within a narrow range.
3. Positive and negative feedback loops regulate processes to achieve homeostasis.
4. Choices B, C, and D do not specifically relate to the concept of maintaining internal stability like homeostasis does.
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.'
Which characteristic is typically found in prokaryotic cells?
- A. Have a nucleus
- B. Have a capsule
- C. Have membrane-bound organelles
- D. Cannot move on their own
Correct Answer: B
Rationale: Prokaryotic cells are characterized by the absence of a nucleus and membrane-bound organelles. One common feature of prokaryotic cells is the presence of a capsule, which is a protective layer outside the cell wall. This capsule helps protect the cell and can also assist in adherence to surfaces. Therefore, the correct characteristic typically found in prokaryotic cells is that they have a capsule.