PDF AP Biology - Quia
[Pages:49]AP Biology
Photosynthesis (part 1) ? The Light Reactions Life from Light
AP Biology
Originally prepared by Kim B. Foglia Revised and adapted by Nhan A. Pham
Energy needs of life
All life needs a constant input of energy
Heterotrophs (Animals)
consumers
- get their energy from "eating others" (organic molecules make energy through respiration
Autotrophs (Plants)
- produce their own energy from "self"
- convert energy of sunlight
producers
- build organic molecules (CHO) from CO2 - make energy and synthesize sugars through
photosynthesis
AP Biology
How Are They Connected?
Heterotrophs
making energy & organic molecules from digesting organic molecules
glucose + oxygen carbon + water + energy
dioxide
C6H12O6 + 6O2 6CO2 + 6H2O + ATP
oxidation = exergonic
Autotrophs
making energy & organic molecules from light energy
Where's the ATP?
carbon + water + energy glucose + oxygen
dioxide
6CO2 + 6H2O +enliegrhgty C6H12O6 + 6O2
AP Biology
reduction = endergonic
What does it mean to be a plant?
Need to...
collect light energy and transform it into chemical
energy
ATP
store light energy in a stable form to be moved
around the plant or stored
need to get building block atoms from the environment
CO2
produce all organic molecules needed for growth carbohydrates, proteins, lipids, nucleic acids
AP Biology
glucose
N
K P
H2O
Plant Structure
Obtaining raw materials
- sunlight (leaves = solar collectors) - CO2 (stomata = gas exchange)
- H2O (uptake from roots) - nutrients (N, P, K, S, Mg, Fe, etc. through uptake
from roots) AP Biology
Chloroplasts
cross section
absorb
leaves
of leaf sunlight and CO2
CO2
chloroplasts in plant cell
chloroplast
AP Biology
chloroplasts contain
chlorophyll
make
energy and sugar
Plant Structure
Chloroplasts
chloroplast
ATP
H+ HH+ H+ H+tHh+ y+Hla+HkHo++idHH++
- double membrane
- fluid-filled interior (stroma)
outer membrane stroma
inner membrane
- thylakoid membrane contains chlorophyll molecules, electron transport chain (ETC), and ATP synthase
thylakoid granum
AP Biology
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