History of Cells Flashcards
In 1665 what did Robert Hooke Discover ?
He described cells and they defined them as “Cellule” based on pores in Cork(Cells)
Dead cell walls of plant cells
They appeared like small compartments when viewed in microscope .
He observed them in thin slices .
1665 , he published Micrographia , in which he describes and draws a lot of his observations.
Gave 60 observations under a compound microscope
What did Zacharias Janssen discover in 1590 ?
Invented the microscope
His father hans, also played a crucial role in the creation of the instruments.
What did Robert Brown observe in 1831 ?
He observed nucleus
discovering the nucleus of a cell
discovered the nucleus in plant cells
What did Theodor Schwan discover ? 1839
Credited universal theory
Animal Life is cellular
Yeast cells divide
Based on Modern cell theory
Concluded in 1839 that all tissues are made of cells and he worked on fermentation and discovered enzymes as pepsin .
What is Life?
The ability to maintain a constant internal state despite environmental variation.
To harness a usable form of energy to aid in this
The ability to generate offspring that retain key characteristics of parents
What are the three principles of Cell theory ?
All living organism are composed of one or more cells
Cell is the basic unit of structure and organisation in organism .
Cells arise from pre existing ones .
What did Louis Pasteur dis cover ?
Showed that bacteria grow in sterile nutrients broth after being exposed to air disapproving the theory of spontaneous generation of cells.
Disproving spontaneous generation .
He was the first scientists to prove that cells can only form pre existing cells .
What did Henri Durocher discover ? in 1824
Cellular Plant and animal life
Cell dissociation
Boiling nitric acid
Claimed cells were a physiological unit rather than a structural unit
He also discovered osmosis , which a passage of liquid through a semi permeable membrane investigated respirations , embrydoy and the effects of lights on plants .
What did Mathias Jacob Scheiden discover ?1838
recognized the importance of the cell nucleus.
Different parts of the cell parts of the plant organism are composed of cells or derivatives of cells.
Specifically, he observed that “the lower plants all consist of one cell, while the higher ones are composed of (many) individual cells.
proposes that all plant tissues are composed of cells, and that cells are the basic building blocks of all plants. This statement was the first generalized statement about cells.
Based on Modern Cell theory .
All living things life is composed of one or more cells.
Cell is a basic unit of life.
States that plant tissues are made of cells.
