


Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Community
Ask the community for help and clear up your study doubts
Discover the best universities in your country according to Docsity users
Free resources
Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors
workshop 2 Material Type: Exam; Class: General Biology; Subject: Biology (BIL) ; University: University of Miami; Term: Unknown 1989;
Typology: Exams
1 / 4
This page cannot be seen from the preview
Don't miss anything!
Conditions of Early Earth :
Lecture presented possible scenarios for the origin of the chemicals necessary for the evolution of early life on Earth. Radioisotope dating using 235 U decay indicates that the Earth is around ____________? old and that life originated between ________________? years ago.
Most biologists believe that life evolved on Earth from nonliving materials (chemicals) that became ordered into collections of molecules capable of self-replication and metabolism. Conditions on the primitive Earth are thought to have favored the spontaneous formation of organic monomers, the linking of these monomers into polymers, the development of self-replicating molecules, and the grouping of aggregates of organic molecules into droplets called ______________? As a group, openly discuss the differences between the following major ideas of the origins of life: Special Creation , Extra-terrestrialism , and Chemical Evolution.
Stanly Miller and Harold Urey, of the University of Chicago in 1953’s were the first to experimentally test the idea that chemical evolution may have given rise to the precursor molecules of life. Below is a picture of their experimental apparatus. Each member of your group should answer a part of the question, in turn. Discuss the important points of each question. A. Consider the Stanley Miller apparatus. What was it meant to simulate ___________________________?
Page 1 Biology 150 Workshop – Origins of Life
B. What molecules are found in the reaction vesicle that is labeled “ A .”
C. The atmosphere inside the vessel “ A .” is described as a chemically ____________? atmosphere?
D. In the sample vesicle which they tested for various types of chemical made… what molecules did they find in “ B .”
E. In their experiment, what energy source(s) were provided, and what was it likely meant to simulate?
F. How might each of the molecules made in the Miller/Urey apparatus have contributed to the formation of early cells?
Components of Life: Have one member, each in turn, define for the others in your Learning Community…
b. protein c. _________________________ and d. _________________________
c. carbohydrate e. _________________________ and f. _________________________
d. lipid g. _________________________ and h. _________________________
Where did the Chemicals of Life come from? Have one member of your group, in turn, answer each question.
One hypothesis, popular in many scientific circles, suggests that Life originated as a result of the "seeds of life" (e.g., primitive chemical, macromolecules, cells, etc.) having been carried here via extraterrestrial means.
While it very difficult to absolutely define life in precise terms to cover all known varieties of living things, it is easy to list multiple properties of living cellular things. I have identified the top 10 things that characterize the living condition and they include:
a. there are 3 primary mechanisms by which cells can transform energy. They are:
b. the natural elements of the human body show that these 4 elements occur in the greatest amounts?
c. the evolution of the eukarya may have been the single most important step in evolution of multi-cellular life forms and was a key step that lead from a primordial cell to plant & animal life. Name 4 important probable steps that would have to have occurred in the evolution or eukaryotes from a primordial cell?
d. one member should define… metabolism and then another member should distinguish between an autotroph and a heterotroph?
e. name 3 properties of a metabolic pathway?
f. tell the other members of your group what osmoregulation is and why it is a property of living systems?
g. what is cyclosis?
h. We spent a lot of time in class describing life in terms of a cell. Have one member of your group define, in relatively formal terms, tell what a cell is and then ask your group to add to it or change the definition presented.