Cell theory Knowledge-Based Practice

Questions

1. 1.

   In the historical development of cell theory, which finding allowed Theodor Schwann to generalize Matthias Schleiden's earlier proposal regarding plants to all living organisms?

   • A) Showing that diverse animal tissues are fundamentally composed of individual cells and cellular products
   • B) Demonstrating that genetic material within the nucleus directs metabolic processes across kingdoms
   • C) Proving that microscopic organisms arise spontaneously from non-living organic fluids
   • D) Establishing that animal cells possess a rigid cellulose boundary identical to that of plant cells
2. 2.

   Which of the following principles represents an addition incorporated into modern cell theory rather than an original tenet of classical cell theory?

   • A) All living organisms consist of one or more cells.
   • B) The cell is the fundamental structural and functional unit of life.
   • C) All cells originate exclusively from pre-existing cells.
   • D) Energy flow and biochemical metabolism occur directly within individual cells.
3. 3.

   Which of the following biological entities is considered an exception to classical cell theory because it lacks an independent cellular structure and cannot carry out metabolic activities on its own?

   • A) Viruses
   • B) Cyanobacteria
   • C) Unicellular fungi
   • D) Free-living protozoans
4. 4.

   Which scientific contribution provided the critical premise that completed classical cell theory by explaining the origin of new cells?

   • A) Robert Hooke coined the term "cell" after observing hollow compartments in non-living cork tissue.
   • B) Antonie van Leeuwenhoek documented motile single-celled organisms discovered in pond water samples.
   • C) Rudolf Virchow asserted that all living cells arise exclusively from the division of pre-existing cells.
   • D) Matthias Schleiden concluded that structural plant tissues develop from spontaneous fluid crystallization.
5. 5.

   Which of the following statements represents one of the foundational tenets of classical cell theory?

   • A) All living organisms are composed of one or more cells.
   • B) Cells can spontaneously generate from non-living organic matter under suitable environmental conditions.
   • C) Genetic material in all living cells is enclosed within a membrane-bound nucleus.
   • D) All cells possess a rigid outer cell wall that maintains their definitive shape.

Answers and step-by-step solutions appear after you finish the test.