Nokea
What human tissue allows the body to move?
- A. Connective.
- B. Epithelial.
- C. Muscular.
- D. Nervous.
Correct Answer: C
Rationale: The correct answer is C: Muscular tissue. Muscular tissue is responsible for movement in the body as it contains specialized cells that can contract and relax, generating force to move body parts. Connective tissue (A) mainly provides support and structure, while epithelial tissue (B) functions in protection and absorption. Nervous tissue (D) transmits electrical signals but does not directly contribute to movement like muscular tissue does. Therefore, the correct choice is C as it is the only tissue type directly involved in body movement.
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Why does cytokinesis occur?
- A. DNA replication occurs
- B. Organelles generate energy
- C. Bacteria are eliminated
- D. Daughter cells can separate
Correct Answer: D
Rationale: Cytokinesis is the process of separating daughter cells at the end of cell division. It ensures that the newly formed cells can function independently. Choice A is incorrect because DNA duplication occurs during the S phase of the cell cycle, not during cytokinesis. Choice B is incorrect as organelles converting energy is not the primary purpose of cytokinesis. Choice C is irrelevant as the elimination of bacteria is not related to cytokinesis.
The structure of a bacteria is circular. Which bacteria fits this criteria?
- A. Mycobacterium.
- B. Actinomyces.
- C. Clostridium.
- D. Neisseria.
Correct Answer: C
Rationale: Rationale:
1. The correct answer is C: Clostridium.
2. Clostridium is a type of bacteria that has a circular structure known as a plasmid.
3. Plasmids are small, circular DNA molecules found in bacteria.
4. Mycobacterium (A) has a rod-shaped structure with a linear chromosome.
5. Actinomyces (B) has a filamentous structure, not circular.
6. Neisseria (D) has a diplococci shape, not circular.
In summary, Clostridium fits the criteria of having a circular structure due to its plasmid, making it the correct choice.
Of all the molecules that are significant to biology, which of the following are considered the most important?
- 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: The correct answer is A: Carbohydrates, lipids, proteins, and nucleic acids are considered the most important molecules in biology. Carbohydrates are essential for energy production, lipids play a role in energy storage and cell membrane structure, proteins are involved in various cellular functions, and nucleic acids carry genetic information. While calcium, sulfur, and iron are important elements in biology, they are not considered as primary biological molecules compared to carbohydrates, lipids, proteins, and nucleic acids.
What is the purpose of cellular respiration?
- A. Produce enzymes.
- B. Produce oxygen molecules.
- C. Enable fermentation.
- D. Obtain energy in the form of ATP.
Correct Answer: D
Rationale:
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.