← scientists for bio Test
4 Written Questions
3 Multiple Choice Questions
- developed a scientific theory of biological evolution that explains how modern organisms evolved over long periods of thime through descent from common ancestors. He notied that species varied globally, locally, and over time.
- concluded that genes were made of DNA. He redid Griffith's work.
- believed that the earth was older than a few thousand years and concluded that Earth is extremely old and that the processes that changed Earth in the past are the same processes that operate in the present.
3 True/False Questions
Watson and Crick → They studied viruses, ,or non-living particles taht infect living organisms. They studied a virus that infects and kills baceria made of DNA core and protein coat. It attaches to the surface and injects its genetic material. Viral genes reproduce in bacteria, destroying it, an hundreds of new viruses burst out.
Lamark → concluded that genes were made of DNA. He redid Griffith's work.
Griffith → questioned how bacteria makes people sick. He isolated 2 types of bacteria that they thought caused pneumonia- smooth coated caused pneumonia & rough coated was harmless. He then inject mice with both types. The mice w/ the harmful virus died and the others lived. He then exposed the mice to a heat killed harmful virus, and they died. Mice w/ a mix of heat-killed harmful virus & harmful virus & mice died. he hypothesized how rough coated bacteria transformed into smooth coated bacteria, and possibly vice versa.