Question

development of cell theory
today, we have no problem believing the basic tenets of the cell theory.

1. all organisms are composed of one or more cells.
2. the cell is the basic unit of structure and function in living things.
3. all cells come from pre - existing cells.

we would find it hard to believe that others ever disputed its claims. however, that was not always the case. as a matter of fact, the basic ideas of the cell theory were once hotly debated. not all scientific discoveries come out of a laboratory where scientists sit around in white coats. and most scientific theories are not quickly discovered and accepted. most are a lengthy process of discovery and debate.
the discovery of the cell was made possible by the invention of the microscope. in the 1600s when the first microscopes were being developed, the idea of cells were unheard of and there were some pretty crazy ideas about where life came from. in the 1600s, a scientist by the name of anton van leeuwenhoek made his own microscope, and discovered bacteria from dental scraping, calling them animalcules. about the same time, another scientist, robert hooke, coined the term \cell\ while looking at cork under the microscope.
what had the greatest effect on the development of the cell theory?
a changing world views
b laboratory experiments
c development of the microscope
d popularity of scientists such as louis pasteur
many scientists made significant contributions to the development of the cell theory. which of these does not correctly pair a scientist with his contribution to the cell theory?
a matthias schleiden: all living things are made of cells.
b rudolf virchow: all cells come from pre - existing cells.
c theodor schwann: all cells come from pre - existing cells.

Explanation:

For the first question: The development of the microscope allowed scientists to observe cells, which was crucial for the cell theory. Without microscopes, the existence of cells (the basis of the cell theory) would not have been discovered. Changing world views (A) is too vague. Laboratory experiments (B) and the popularity of scientists (D) are not as fundamental as the tool (microscope) that enabled the observation of cells.
For the second question: Theodor Schwann's contribution was that animals are made of cells. The idea that all cells come from pre - existing cells was Rudolph Virchow's contribution. So option C is incorrect as it misattributes the "all cells come from pre - existing cells" idea to Theodor Schwann.

Answer:

First question: C. development of the microscope
Second question: C. Theodor Schwann: All cells come from pre - existing cells.