Class Notes (834,991)
Canada (508,850)
Biology (2,228)
BIO120H1 (1,171)
all (31)
Lecture 15

Lecture 15 16.docx

4 Pages
127 Views
Unlock Document

Department
Biology
Course
BIO120H1
Professor
All Professors
Semester
Summer

Description
Lecture 15 -Within the deepest mantles of the earth exists extremotrophs, which do not thrive on sunlight but rather use chemical oxidation -Alongside other organisms that fix organic carbon, these are quite abundant -The three raw ingredients to fix carbon are an energy source, an electron donor, an inorganic carbon source -In the photosynthetic passway, one sees a chemical reaction undergoing -First step is light, which attaches to the donor, and secondarily there is carbon in another pathway - The light pathway is converted into a chemical reaction NADPH, and converts with CO2 into sugar -C4 pathways are more expensive pathways, and found primarily in areas that are hot and dry -Under these conditions, c4 pathways which are expensive, can outcompete the previous c3 pathways -It comes as no surprise that C4 pathways area some of the worse weeds in the world -CAM Photosynthesis uses a process where CO2 is absorbed during the night-time -The extra pathway allows it to capture CO2 at night, since plants intake CO2 during the night and lose it during the hot day -Plants must operate during the coolest possible period, and this form of metabolism is referred to as CAM -In anoxic photosynthesis, organisms use a sulfur compound to photosynthesize rather than water -The sulfur serves as the electron donor, andthis produces a sulfur waste compound -This also serves as the generic formula of photosynthesis, substitute S with O and the same applies -Chemosynthesis is often found from thermal geysers and activity from deeper within the Earht’s core -The mid-Ocean Ridge is slowly spreading apart, separating and pushing out chemicals and other materials -Reduced ions are being pushed onto the surface -The discovery of these tectonic shifts and the pushing of the mid-Ocean Ridge begun with Alvin -Alvin is an unmanned craft which was taking pictures on the deepest levels of the Ocean -The existence of fish and crabs in these regions of hydrothermal vents surprised many -As they looked further, ephemeral (short-lived, unpredictable communities) communities which often died quickly popped up to utilize these chemicals and disappear -Bacteria in these areas are utilizing the bacteria in these areas in order to fix Carbon, using energy from oxidation reactions Lecture 16 -Deserts in the Old and New World demonstrate very similar appearances and adaptations, despite the fact that they are very different -The reason so being is that desert had evolved much after the two landmasses had separated -How communities are put together and form depend on body size and trophic size and their ecological implications -A question regarding body size is which organism has a f
More Less

Related notes for BIO120H1

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit