BIOL 2020U Lecture Notes - Decomposer, Lignin, Saprotrophic Nutrition

16 views3 pages
29 Jan 2013
School
Department
Professor
Metabolism
All chemical reactions in a cell → arranged into metabolic pathways
Intermediates in these pathways are called metabolites
Catabolic reactions (e.g. respiration) release energy
Anabolic reactions (e.g. photosynthesis) use up energy
Leaf Structure
Phototropism → growth towards light
Large leaf surface area → captures more light
Thin leaves → few cell layer → more light captured by chlorophyll
Leaf mosaic increases leaf exposure to light
Internal Structure
o Cuctile → reduces H2O loss by evaporation
o Palisade mesophyll → chloroplast can move around cell for max light absorption
o Spongy mesophyll → allows diffusion of gases through leaves
o Phloem sieve tube → removes products of photosynthesis
Chloroplast
Thylakoid membrane: light-dependent → large surface area
o Associated with chlorophyll, accessory pigments, ETC, enzymes
Grana: stacks of thylakoid membranes
o Enclose hydrogen reservoir used in chemiosmosis
Lamella: tubular extensions forming a network between grana
Stroma: RuBP carboxylase catalyses light independent reaction
Starch granule → insoluble storage carbohydrate product of photosynthesis
Light Dependent Reaction
In Thylakoid Membrane / Granum
IMG 5-14-6
Chemiosmosis/Photophosphorylation produces ATP
//H+ from photolysis remain in thylakoid space
ETC releases energy
Used to pump H+ from stroma into thylakoid space
By active transport and electrochemical gradient
H+ conc in thylakoid space > stroma
H+ ions pass back from space between two mitochondrial membranes
Through pores which are associated with the enzyme ATP synthetase
Unlock document

This preview shows page 1 of the document.
Unlock all 3 pages and 3 million more documents.

Already have an account? Log in

Get OneClass Notes+

Unlimited access to class notes and textbook notes.

YearlyBest Value
75% OFF
$8 USD/m
Monthly
$30 USD/m
You will be charged $96 USD upfront and auto renewed at the end of each cycle. You may cancel anytime under Payment Settings. For more information, see our Terms and Privacy.
Payments are encrypted using 256-bit SSL. Powered by Stripe.