Question

biology bellringer concept covered: task review 1. which organelle acts as the control center of the cell, storing genetic information and directing all cell activities? a. nucleus. b. mitochondrion c. ribosome. d. golgi apparatus 2. describe the role of the mitochondria in energy production and explain how this process benefits the entire cell. 3. when blood sugar levels rise after eating, the pancreas releases insulin to help lower glucose levels. this is an example of: a. positive feedback b. negative feedback c. neutral feedback d. no feedback loop 4. which macromolecule is the main component of cell membranes and is responsible for forming a barrier between the inside and outside of the cell? a. carbohydrates b. proteins c. lipids d. nucleic acids 5. give an example in the human body of each level of organization (cell > tissue > organ > organ system > organism)

Explanation:

1. The nucleus stores DNA and controls cell activities.
2. Mitochondria perform cellular respiration, providing ATP.
3. Insulin - glucose regulation is negative feedback.
4. Lipids form the basis of cell membranes.
5. E.g., muscle cell, muscle tissue, heart, circulatory system, human.

Answer:

1. A. Nucleus.
2. Mitochondria perform cellular respiration, producing ATP which powers cell processes.
3. B. Negative feedback
4. C. Lipids
5. Cell: Muscle cell; Tissue: Muscle tissue; Organ: Heart; Organ system: Circulatory system; Organism: Human