bioexam.pdf - Exam#1 Monday 11:38 AM 1 The archezoa...

This preview shows page 1 - 3 out of 5 pages.

The archezoa hypothesis states that the mitochondria evolved after eukaryotes had already evolved a true nucleus. 1. Based on the studies on ribosome structure, the Eocyte tree suggests that eukaryotes are more closely related to some archaea than others. 2. Eukaryotic nuclei contain bacterial genes most likely because Genes from endosymbionts were transferred to the host cell 3. What are the 3 fundamentals of the cell theory? How does Pasteur’s experiment relate to the cell theory? Explain. See diagram provided; do not repeat the details of the experimental procedure in your answer. 4. The fundamentals of the cell theory are: i) All living organisms are composed of cells. ii) Cells are the building blocks of life. iii) All cells arise from pre-existing cells and there is no spontaneous generation of cells. Pasteur’s experiments showed that all else being equal when a sterilized broth was exposed to the dust particles in air there was microbial growth in the broth, but when a trap prevented the dust particles from getting to the broth there was no microbial growth showing that there was no spontaneous generation of microbes. Microbial growth resulted from exposure to dust, which must have brought microbes with it: microbes arose from pre-existing microbes. Explain how the results of Miller and Urey’s experiment (see diagram provided) relate to i) abiogenesis as proposed by Oparin and Haldane, ii) Pasteur’s experiment. 5. Miller and Urey’s experiment was designed to test Oparin and Haldane’s hypothesis and the results support the first part of the hypothesis as they showed that, given the right environmental conditions, through random reactions simple organic molecules can be produced from simple inorganic molecules plus methane in the absence of oxygen. Miller and Urey’s experiment and results have nothing to do with Pasteur’s experiment, which dealt with where cells come from in the current conditions of the earth (biogenesis), and was not designed to test Oparin’s theory of abiogenesis about the origin of cells in the early earth. The major difference between the conditions of the early earth and current earth is absence of oxygen in the early earth versus presence of oxygen in the current atmosphere. Molecular oxygen is reactive and oxidizes organic molecules, thus preventing accumulation of such molecules, as expected in the early stages of abiogenesis. According to the seeding hypothesis meteorites may have brought ___________ to earth. 6. Living microorganisms and Amino or nucleic acids Charles Lyell’s theory of uniformity Suggested that earth was much older than previously thought 7. Exam #1 Monday, March 11, 2019 11:38 AM Quick Notes Page 1
Image of page 1
Charles Lyell’s theory of uniformity Suggested that earth was much older than previously thought 7.
Image of page 2

Want to read all 5 pages?

Image of page 3

Want to read all 5 pages?

You've reached the end of your free preview.

Want to read all 5 pages?

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern