Photosynthesis II BIO 105 Cr.4
UW - L
Popular in General Biology
Popular in Biology
verified elite notetaker
This 0 page Class Notes was uploaded by MaKena Betler on Sunday November 1, 2015. The Class Notes belongs to BIO 105 Cr.4 at University of Wisconsin - La Crosse taught by a professor in Fall 2015. Since its upload, it has received 17 views. For similar materials see General Biology in Biology at University of Wisconsin - La Crosse.
Reviews for Photosynthesis II
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
Date Created: 11/01/15
Lecture 22 Photosynthesis II o Photosynthesis The Big Picture 0 Plants use radiant energy from the sun to x carbon bonds that contain stored chemical energy 0 Photosynthesis consists of two sets of reactions Light Reactions Calvin Cycle 0 Uses ATP energy and 7 from NADPH to reduce 6 C02 and produce carbohydrates 0 Carbon xation reducing atmospheric C02 to produce biological molecules Happens as part of the Calvin Cycle metabolic pathways with the net reaction 6C0218ATP12NADPH12H20 gtC6H120618ADP18Pi12NADPL 0 Overall Phases 39 Carbon Fixation 3RuBPC02 gt63phosphoglycerate Rubisco a notably bad enzyme 0 Catalyzes only 3 reactionssecond at maximum 0 Thus a lot of enzyme 50 of protein in a leaf most abundant protein on Earth 0 Even worse active site has only 10fold preference for binding C02 rather than 02 Thus often uses 02 to oxidize ribulose biophosphate instead of xing C02 Oxidized converted by several steps to 3 phosphoglycerate This consumes ATP and releases C02 0 Thought to be a remnant of evolution like the human appendiz Photosynthesis appeared 35 billion years ago No 02 in atmosphere at the time No evolutionary sequence changed could preserve C02 xation while eliminating 02 use 12 million years ago new plants appeared wit mechanisms to minimize photorespiration corn some grasses cacti succulents can grow faster or in hotterdrier climates Among the mechanisms 2nCI enzyme to x C02 different mechanism never uses 02 Key Concept 1 Many molecular processes in life occur in what appear to be very nonoptimal ways as a result of evolutionary happenstance O 00 Building polymers Simple chemistry now used to create complex molecules for use by organisms Transport sugars xed carbon to other parts of the plant Sugars primarily sucrose are transported throughout the plant in conducting tissue called phloem Use of complex organic molecules Structural polysaccharides Cellulose in plant cell walls Starch stored to run cellular respiration Starch is stored in potato tubers underground 0 Potato plants use starch for growth and asexual reproduction Humans grow potatoes for food Amount of total photosynthesis Gross Primary Productivity Amount of stored energy that is used Respiration Amount of stored energy available to consumers NPP Net Primary Productivity Food Chain Pathway along which food energy is transferred
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'