Nokea
The cellular membrane consists of a bilayer of which substances?
- A. Nucleic acids
- B. Phospholipids.
- C. Proteins.
- D. Carbohydrates.
Correct Answer: B
Rationale:
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Where in the cell does the Krebs cycle take place?
- A. mitochondrion.
- B. Nucleus.
- C. Cytoplasm.
- D. Chloroplast.
Correct Answer: A
Rationale:
What are the two catabolic pathways that lead to cellular energy production?
- A. Fermentation and cellular respiration
- B. Fermentation and external respiration
- C. Fermentation and anaerobic respiration
- D. Fermentation and internal respiration
Correct Answer: A
Rationale: The correct answer is A: Fermentation and cellular respiration. Fermentation and cellular respiration are two catabolic pathways that lead to cellular energy production. Fermentation occurs in the absence of oxygen and involves glycolysis followed by the conversion of pyruvate to various byproducts. Cellular respiration, on the other hand, occurs in the presence of oxygen and involves glycolysis, the citric acid cycle, and the electron transport chain to produce ATP. While fermentation and anaerobic respiration involve partial breakdown of glucose without the complete utilization of oxygen, the term 'internal respiration' is not a commonly used concept in the context of cellular energy production.
The cellular membrane consists of a bilayer of which substances?
- A. Nucleic acids
- B. Phospholipids
- C. Proteins
- D. Carbohydrates
Correct Answer: B
Rationale: The cellular membrane is primarily composed of a phospholipid bilayer, forming the structure that regulates entry and exit.
Why does cytokinesis occur?
- A. To duplicate DNA
- B. To convert energy within organelles
- C. To eliminate bacteria
- D. To divide daughter cells
Correct Answer: D
Rationale: Cytokinesis is the process of cell division following mitosis, where the cytoplasm of a cell is split into two daughter cells. The main purpose of cytokinesis is to physically separate the newly formed nuclei and organelles into individual cells, ensuring that each daughter cell receives a complete set of cellular components to function independently. Therefore, the correct answer is D, as the primary outcome of cytokinesis is the division of daughter cells.
Which term means a group of similar cells combined to perform a common function?
- A. Tissue
- B. Organism
- C. System
- D. Organ
Correct Answer: A
Rationale: The correct answer is 'Tissue.' Tissue is a group of similar cells that work collectively to carry out a specific function. These specialized cells combine to form tissues, which further combine to create organs. Organs then collaborate within systems in the body to maintain balance (homeostasis) and perform various functions such as digestion, circulation, and respiration.