Cell , Cell Theory Flashcards
(20 cards)
What is a cell?
The fundamental structural and functional unit of all living organisms
Unicellular organisms can exist independently and perform essential life functions.
Who first saw and described a live cell?
Antonie Von Leeuwenhoek
What did Robert Brown discover?
The nucleus
What significant invention revealed the structural details of the cell?
The microscope and its improvement leading to the electron microscope
Who formulated the cell theory?
Matthias Schleiden and Theodor Schwann
What did Matthias Schleiden observe about plants?
All plants are composed of different kinds of cells which form the tissues of the plant
What did Schwann conclude about animal cells?
Cells have a thin outer layer known as the plasma membrane
What unique character did Schwann identify in plant cells?
The presence of a cell wall
What was Rudolf Virchow’s contribution to cell theory?
He explained that cells divide and new cells are formed from pre-existing cells (Omnis cellula-e cellula)
What are the two main points of the cell theory as understood today?
- All living organisms are composed of cells and products of cells
- All cells arise from pre-existing cells
Fill in the blank: The bodies of animals and plants are composed of _______.
cells and products of cells
What is a cell?
A cell is the fundamental structural and functional unit of all living organisms, capable of independent existence and performing essential functions of life.
Who first saw and described a live cell?
Antonie Von Leeuwenhoek first saw and described a live cell.
What did Robert Brown discover?
Robert Brown discovered the nucleus.
What did the invention of the microscope reveal?
The invention of the microscope and its improvement to the electron microscope revealed all the structural details of the cell.
What is cell theory?
Cell theory states that all living organisms are composed of cells and products of cells, and all cells arise from pre-existing cells.
Who formulated the cell theory?
Matthias Schleiden and Theodor Schwann together formulated the cell theory.
What unique character did Schwann identify in plant cells?
Schwann identified that the presence of a cell wall is a unique character of plant cells.
Who modified the cell theory and how?
Rudolf Virchow modified the cell theory by explaining that new cells are formed from pre-existing cells (Omnis cellula-e cellula).
What are the two main points of the modern cell theory?
- All living organisms are composed of cells and products of cells. 2. All cells arise from pre-existing cells.
