Cell theory and its exceptions — practice questions
9 questions in the bank on this idea. Below are 9 of them, exactly as they appear in a test.
Who stated that all plants are composed of cells?
- A. Theodor Schwann
- B. Matthias Schleiden
- C. Rudolf Virchow
- D. Robert Brown
Which statement added by Rudolf Virchow completed the basic cell theory?
- A. All cells contain a nucleus
- B. Cells arise from pre-existing cells
- C. All cells have a cell wall
- D. Cells are always independent organisms
A biological structure can reproduce only inside a host cell and lacks independent cellular organisation. Why is it not treated as a typical cell in classical cell theory?
- A. It is too small to be considered living
- B. It lacks cellular organisation and independent metabolism
- C. It contains genetic material
- D. It can evolve
In tissue culture experiments, leaf mesophyll cells are put in a culture medium to form callus. This phenomenon may be called as
- A. Dedifferentiation
- B. Development
- C. Senescence
- D. Differentiation
Which of the following functions is carried out by cytoskeleton in a cell?
- A. Protein synthesis
- B. Motility
- C. Transportation
- D. Nuclear division
The Phenomenon by which the undividing parenchyma cells start to divide mitotically during plant tissue culture is called as
- A. Secondary growth
- B. Differentiation
- C. Dedifferentiation
- D. Redifferentiation
Which type of substance would face difficulty to pass through the cell membrane?
- A. Substance soluble in lipids
- B. Substance with hydrophobic moiety
- C. Substance with hydrophilic moiety
- D. All substance irrespective of hydrophobic and hydrophilic moiety
An organism is made of many specialised cells, while a second living entity is a single cell that performs all essential life functions. Which principle of cell theory applies to both?
- A. The cell is the basic structural and functional unit of life
- B. Only multicellular organisms are cellular
- C. A cell must always be specialised for one function
- D. Single cells cannot maintain independent life
Suppose a newly discovered biological entity contains DNA and ribosomes but has no plasma membrane, cannot maintain an internal environment, and functions only after entering another cell. Which conclusion is most consistent with cell theory?
- A. It should be considered a normal free-living cell
- B. It does not satisfy the organisational features expected of a cell
- C. It must be a plant cell because it contains ribosomes
- D. It proves that plasma membranes are unnecessary for cells
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