cell bio unit 2

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62 Terms

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enzymes

mostly protein, catalyze rxns leading to bond formation

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active site

region where substrate binds

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substrate

molecule involved in rxn that binds to an enzyme

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product

resulting molecules from rxn

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factors affecting enzymes

pH, temperature, cofactors

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cofactors

moleuces/ions needed by proteins in its structure to get ideal shape

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increase in temp

charged bonds start breaking, protein denatures

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decrease temp

protein loses flexibility, can’t hold substrate easily, molecule movement in soln decrease, makes it harder to reach enzyme by chance

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increase pH

less H+ to help maintian shape

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decrease pH

H+ interaction disrupts H-bonds and ionic bonds

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inhibitors

stop enzyme from working

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competitive inhibitors

bind to active site of enzyme, stopping access to normal substrate, shape resembles normal substrate

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non-competitive inhibitors

bind allosterically, shape of enzyme changes so substrate cannot bond

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energy molecules

ATP, GTP, NADH, FADH2

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3 ways to make ATP

substrate-level phosphorylation, oxidative phosphorylation, photophosphorylation

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substrate-level phosphorylation

uses enzyme to transfer PO4 from one molecule to ADP to make ATP

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oxidative phosphorylation

addition of PO4 to ADP, powered by oxidation of NADH/FADH2

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cellular respiration

glycolysis, pyruvate conversion, KREBS/citric acid/ tricarboxylic acid cycle, oxidative phosphorylation

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glycolysis

splits glucose into 2 pyruvates, takes place in cytoplasm, make 2 net ATP, 2 NADH

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pyruvate conversion

converts pyruvates into acetyl groups, takes place in mitochondria, 0 ATP, 2 NADH, 2 CO2

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KREBS/citric acid/ tricarboxylic acid cycle

release E from acetyl group in a cycle, takes place in mitochondria, 2 ATP, 6 NADH, 2 FADH2, 4 CO2

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oxidative phosphorylation

further energy production, strong ATP production, takes place in mitochondria, 34 ATP, -10 NADH, -2 FADH2

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glycolysis steps

glucose —> ATP —> ADP

glucose 6-phosphate —>

fructose 6-phosphate —> ATP —> ADP

fructose 1,6-biphosphate —>

(2) glyceraldehyde 3-phosphate

(1) glyceraldehyde 3-phosphate —> NAD+ —> NADH + Pi

1,3 biphosphoglycerate —> ADP —> ATP

3 phosphoglycerate —>

2 phosphoglycerate —>

phosphoenol pyruvate —> ADP —> ATP

pyruvate

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Pyruvate conversion steps

pyruvate —> NAD+ —> NADH, -CO2

acetyl —> + Co enzyme A

acetyl coenzyme A (Acetyl CoA)

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Citric Acid/ KREBS/ Tricarboxylic acid cycle

drops of acetyl group —>

citrate —> NAD+ —> NADH, -CO2

5 carbon —> NAD+ —>NADH, - CO2

4 carbon —>

GTP —> GDP , ADP —> ATP

FADH—> FADH2

NAD+ —> NADH

oxaloacetate (OAA)

—> citrate/citric acid

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when O2 run low/cannot be acceptor

ETC backs up, electrons filling each ETC protein, cannot produce NAD+ from NADH since it is backed up, prevents anything past glycolysis from forming, only uses 2 ATP instead of making 38

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chemiosmosis

process of H+ entering membrane resulting in ATP production

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human solution to no O2

reduce pyruvate using NADH

pyruvate —> NADH —> NAD+

lactate

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yeast cell solution to no O2

reduce pyruvate, produces ethanol

pyruvate —> NADH —> NAD+

acetaldehyde —>

ethanol

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photosynthesis eqtn

6 CO2 + 6 H2O + light E —> 6 O2 + C6H12O6

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stroma

space inside chloroplast

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thylakoid membrane

outer layer of thylakoid

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thylakoid space

area inside thylakoid

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reflection

light hits and object and reflects off, object does not get energy

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transmission

light goes through an object, object does not get energy

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absorbed

light absorbed by object, object gets energy

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pigments

contains molecules that capture light well, when the energy is absorbed an electron in the blank becomes excited

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light harvesting compound

protein with pigments embedded with chlorophyll in the middle forming the reaction center, important during photosynthesis

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reaction center

2 chlorophylls, ultimate receiver of the light energy

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photosystem

larger protein complex w light harvesting on top of it

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Light dependent reactions steps

  1. chemiosmosis produces ATP via H+ gradient across thylakoid membrane, H+ ions go through ATP synthase producing ATP by forming bond b/w ADP and Pi

  2. Maintaining Gradient via light capture

    A) light wave hits PS 2 which excites its electrons, electrons transfer continues until rx center, excited chlorophyll electrons enter ETC, use energy to move H+ against the gradient

    B) light wave also hits LHC of PS 1, high energy electrons from chlorophyll enter 2nd ETC end up at the enzymatic protein, NADP reductase, NADP + H —> NADPH

    C) Account for electrons, electrons from PS 1 now in NADPH, PS1 grabs electrons from PS 2, PS 2 grabs electrons from water, forms O2 to provide electrons to recuperate from the electron loss

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NADP reductase

enzyme catalyzes reaction of NADP+ H to NADPH

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photophosphorylation

uses light energy to drive ATP formation

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non-cyclic photophosphorylation

electrons do not cycle, make ATP and NADPH

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cyclic-photophosphorylation

electrons cycle, make ATP

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light independent reactions

takes place in stroma of chloroplast, uses electrons form light reaction (ATP and NADPH) to join CO2s together to make glucose

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calvin cycle

key pathway of Dark reactions

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photorespiration

occurs when O2 binds instead of CO2 with rubisco, new product is made that does not enter calvin cycle, CO2 lost w new pathway

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carbon fixation

takes gaseous CO2 and makes it fully organic

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normal conditions in C3 leaf

O2 flows outs (low conc outside), CO2 flows in (low conc inside)

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dry conditions in C3 leaf

plant closes stomatal pore to prevent water loss, continues to fix CO2 so CO2 levels decrease, plant keeps splitting H2O so O2 levels increase, O2 binds to rubisco, photorespiration

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stomatal pore

spaces where gases flow through in/out of leaf

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guard cells

surround stomata, when expanded close stomatal pore

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C3 plant

rubisco fixes CO2 and RuBP for calvin cycle

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C4 plant

split into bundle sheaths and mesophyll cells, pepsco fixes CO2 and PEP 3C forms oxaloacetate, converted to malate (4C), malate travels from mesophyll cell to bundle sheath cells then converts into CO2 and pyruvate, pyruvate (3C) then converts PEP 3C

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phosphoenol pyruvate carboxylase (PEPSCO)

enzyme found in C4 and CAM plants, better at preferentially binding with CO2 over O2

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bundle sheath cells

cells in C4 plants, deeper in cell tissues, not directly exposed to gases

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mesophyll cells

cells in C4 plants, exposed to gases

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CAM plant

uses pesco enzyme to fix CO2 and PEP 3C to make oxaloacetate (4C), then converts to malate (4C), then converted to CO2 and pyruvate (3C), pyruvate then converts to PEP 3C, fixation happens mostly during night

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