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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?
What are the physical changes needed in the body that would require to happen in order for our bodies to live forever. Changes such as telomerase activity, collagen flexibility, environmental changes, role of the immune system, DNA repair enzymes:..
Map of the Drosophila melanogaster X chromosome given, Assume that a female is heterozygous for an inversion of the exact entire region from v to wy.
Sinorhizobium meliloti can be protected from osmotic stress by the presence of certain disaccharides. Dan Orr found that sucrose does a fine job as an osmoprotectant for our strain of S. meliloti,
Assume you treated butter with a fatty acid desaturase, an enzyme that removes hydrogen from fatty acids and creates double bonds.
Create a BIO 113 Labe Report based on a experiment we did on the variances in photosynthtic activity in the Elodea plant.
Describe the way epidemiologist calculate the frequency of cases when it comes to prevelence and incidence. Then discuss some of the major sources of disease tranmission.
The external environment is open directly to the peritoneal cavity of the abdomen and pelvis. This is one source of pelvic inflammatory disease.
Elucidate how at least three organ systems are affected by this increased physical activity and discuss interactions among these systems.
During swimming there is a large increase in end diastolic volume (EDV) of the heart. This leads to an increase in stroke volume. Explain how the increased EDV leads to the increased SV.
I just did a lab with antiseptics and disinfectants and a lab report question asks "were any microorganims increasing within the zone of inhibition of any of the disenfectants or antiseptics?
Decreasing the extracellular K+ concentration would be expected to have which of the effects on the resting membrane potential and excitability of the cell?
The hypothetical OxyA protein is a surface protein that may have a role in attachment to the surface of the intestinal epithelium but there is evidence that it has a role in invasion. Write the structural formula for isoamyl alcohol.
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