QUESTIONS WITH ANSWERS GRADED A+
◉ when was the origin of life?
When was the origin in of cellular life?
cynobacteria?
modern eukaryotes? Answer: 4.6 bya
4 bya
3 bya
2 bya
◉ Size of bacteria. Answer: 2 micrometers
◉ What does it mean that bacteria are ubiquitous? Answer: It means that
they are found everywhere, in the ocean, drinking water, and in
ourselves
◉ 2 events that shaped the development of microbiology are. Answer:
the development of the microscope
controversy of sponteneous generation
, ◉ Robert Hooke. Answer: made first microscopic observations
but his microscopes lacked resolutions, so some of the descriptions of
bacteria were poor
◉ Van Leeuwenhoek. Answer: his lenses had great resolution, and he
made lenses by grinding glasses
◉ Louis Pasteur. Answer: refuted the idea of sponteneous generation by
saying that organisms can grow without O2 present. He was supported
by John Tyndall when he performed the swan flasks experiments
◉ Robert Koch. Answer: Developed the culture plate method to identify
pathogens
◉ Prokaryotes. Answer: Cells that do not contain nuclei
◉ Characteristics differences btn Prokaryotes and Eukaryotes
Ribosomes
Membrane Features
Wall features
Flagella type (locomotion). Answer: Prokaryotes . Eukaryotes