Cell theory Flashcards
What is the cell theory?
Cell theory is a scientific theory that was first formulated back in mid 19th century and it states that all living organisms are made up of cells, cells are the structural and organizational unit of life, and cells came from pre-existing cells by a cell division.
What are the three postulates of the cell theory?
- All living organisms are made up of cells.
- Cells are the basic structural or functional unit of life.
- Cells came from previously existing cells via cell division.
What are the four modern tenets of the cell theory?
- All energy flow such as the metabolism and biochemistry occurs within the cell.
- The cell contains a hereditary information which is the deoxyribonucleic acid that passes from cell to cell through cell division.
- All cells basically have the same chemical composition.
- The activity of an organism depends on the total activity of the independent cells.
First scientist that has to contribution to the history of the cells
Robert Hooke
Who is Robert Hooke?
Robert Hooke is an English Physicist who uses a magnifying lens and observed a sliver of cork and he compared the result to a honeycomb structure. He was the one who termed the cells first since he thought it looks just the same as the empty room where monks live.
What year did Robert Hooke’s discovery reported and where was it reported?
1665 and in the Royal Society London
What is the name of Robert Hooke’s published book?
Micrographia
What did Anton van Leeuwenhoek did?
Anton van Leeuwenhoek was the one who perfected the microscope since he studied new approaches on creating lens. He observed and discovered a protozoa which is a single celled organism and later on named it as “animalcules”. He was the one who first observed feces, pond water, semen, blood, and pepper. He was the first microbiologist and he is the father of microbiology.
What did Leeuwenhoek termed the cells before?
Living units
Father of microbiology
Anton van Leeuwenhoek
What is the dark age?
The dark age of the cell theory is the 150-200 years wherein there were no new information or studies about cells because they believed about the spontaneous generation theory or abiogenesis theory
Who was the first scholar who articulated the spontaneous generation
Aristotle
What is spontaneous generation?
Spontaneous generation theory states that life can arise from non-living matter
Who were the four scientists that either agreed or refuted the spontaneous generation theory/
- Francesco Redi
- Louis Pasteur
- John Needham
- Lazzaro Spallanzani
What was Redi’s experiment?
Francesco Redi’s experiment was he observed 3 jars with meat in it. The first one was unsealed, the next one was cork-sealed, and the last one was gauze-sealed. The 1st jar was contaminated by flies, maggots, eggs. The 2nd one was not contaminated at all. The last one has flies, maggots, eggs on the top of the gauze. It just disproved the spontaneous generation wherein the theory is not applicable for large organisms,
