Critical Thinking Activities - Chapter 4

Question 1. When living tissues are viewed through the microscope, the cells reveal complex internal movements that amazed the early microscopists. "Vitalism" is the belief that some additional vital force is necessary to explain life and this movement of chemical inside cells. Why are modern biologists, who see these complex cells every day, not vitalists?

Question 2. Freezing and thawing of vegetables destroys their structure because small sharp ice crystals pierce the cell walls and destroy the structure. Although meat lacks cell walls, repeated freezing and thawing produces the bad taste of "freezer burn." What is the main organelle involved in this autodigestion?

Answers are available to instructors in the Instructor's Manual.

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