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This lab requires answering questions based on the exhibit "The Earliest Traces of Life" at the Smithsonian Museum of Natural History, Washington, D.C. Consult Laboratory Exercise 10 of the General Biology Study Guide and Laboratory Manual for the address and visiting hours of the museum.Study the exhibit and answer the following questions. Answers to questions must be type written when presented to your Instructor. Please view the short movie that comes along with the exhibit.Early Atmosphere1. How abundant was oxygen in the early atmosphere?2. What evidence do scientists have that the oxygen content of our atmosphere has increased since the earth's origin?3. Why is oxygen more abundant in the atmosphere today?4. What are stromatolites?5. What do scientists think is implied by the presence of stromatolites in Precambrian rock?6. What is ozone and how is it produced?7. Why is ozone important to life today?8. What effect did increased levels of oxygen in the atmosphere have on early life forms?Banded Iron Formation (to the right of the Early Atmosphere exhibit)1. What is banded iron?2. When did these formations become common?3. What is the significance of these formations?The Oldest Rocks: Remnants of a Youthful Earth (by the mural)1. How old are the oldest rocks on Earth?2. What evidence of life do these ancient rocks contain?3. Is this evidence great enough to allow scientists to conclude that life indeed existed during this period?The Earliest Traces of Life1. When do scientists think life originated on Earth?2. What are the oldest fossils and how old are they? The Precambrian1. When did the first cells with nuclei appear?2. Fossils of multicellular animals are from what time period?3. In what era did all of these events take place?Origin of Life1. What six elements are most prevalent in living organisms?2. Were these elements present in the infant solar system?3. What circumstances may have fostered the development of chains of amino acids and nucleotides?4. What are the characteristics of the ancestors of living cells, what could they "do"?5. Why is water important to life?6. What are the "true" hallmarks of life?7. What molecular evidence do scientists have that all life is at least distantly related and has acommon ancestor?8. What conditions exist on the present day earth that make the spontaneous generation of lifeunlikely?9. What conditions are thought to have existed on primitive earth that favored the origin of life?Single-celled Life1. What are cherts?2. How old are these fossils?3. Were these prokaryotic or eukaryotic?4. What evidence for eukaryotic (and possibly multicellular) life is found in the Greyson shale?5. How old is the shale?Multi-celled Life1. Describe the Ediacaran Fauna.2. How old are these fossil?
Select an organism which contains a population having two distinct traits. Red and green beetles. Humans with red hair and brown hair
The energies of glycolysis shows that there is a large drop in free energy upon oxidation of glycerladehydes 3-phosphate to 1,3-bisphosphoglycerate. In the presence of oxygen, some of this energy is ultimately converted into ATP production. though..
What veins are most likely involved? What pathologic changes have happened in these veins, and what is the most probable cause in this patient's case.
Throughout much of Europe, there has been a severe decline in mushroom population. On study plots in Holland, data collected since 1912 indicate that the number of mushroom species has dropped from 37 to twelve per plot in recent years.
If there 2000 offspring from this cross, how several of the offspring will you expect to show Ab or aB phenotypes. If the estimated output is 30000 units, which machine must be purchased.
The Kirb-Bauer Disk Diffusion Technique was performed on 2 different Mueller-Hinton Agar plates. One plate had Escherichia Coli spread on it and the other plate has Staphylococcus Epidermidis spread on it.
Explain plant life, animal life, and geology of the ecosystem in Utah. What populations and communities are present? How dependant is your community on this ecosystem? What are the preventive factors of the ecosystem.
Lysozyme was assayed at bacterial cell wall, = 2.5x10-8 g. The Km for the substrate = 6x10-3g. At the end of one minute 2.5% of the cell wall hydrolysed.
Assume if a man of blood group AB marries a woman of blood group A whose father was of blood group O, to what different blood groups can this man and woman expect their children to belong?
Gases move from areas of high (total) gas pressure to areas of low (total) gas pressure. Also, the pressure of a "canned" gas changes if the container volume changes.
You inoculate an unknown strain of bacteria into a phenol red lactose broth and a nitrate broth. After incubation, you see significant bubbles in the Durham tubes of both tests.
The "Primordial soup" includes the mixture of elements and gases which are thought to have started life on the Earth. Describe Miller and Urey's experiment.
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