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Biology Exam II
n/a
45
Biology
Undergraduate 1
10/24/2010

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Term
Cytomembrane system
Definition
Includes the rough & smooth ER, Vesicles, Golgi complex, Plasma membrane
Term
Golgi Apparatus
Definition
has a cis and a trans face, cis meaning where it receives vesicles and trans where it sends them elsewhere (either to the plasma membrane or to be released by the cell)
Term
Microtubules
Definition
Polymers of Tubulin that help keep a cell's shape as well as provide motility within the cell. 25 nm diameter
Term
Microfilaments
Definition
2 strands of Actin intertwined. helps maintain cell structure and provides muscle contraction. about 7 nm diameter
Term
Intermediate filaments
Definition
fibers constructed of Keratin subunits that help in anchorage of cell structures. 8-12 nm wide
Term
nucleolus
Definition
Synthesizes subunits of ribosomes
Term
Smooth Endosplasmic Reticulum
Definition
No ribosomes. Synthesis of lipids, detox of drugs, contains calcium
Term
Rough Endoplasmic Reticulum
Definition
Ribosomes Attached. Proteins are synthesized to either be secreted by the cell or incorporated into the plasma membrane.
Term
Centrosome
Definition
assembly of microtubules
Term
Vesicle Trafficking
Definition
Rough ER-->'cis' golgi apparatus-->'trans' golgi apparatus-->Plasma membrane OR Secreted by the cell
Term
Structures present in animal but NOT plant cells
Definition
Centrosome, centrioles, flagella, and lysosomes
Term
Plasmodesmata
Definition
a connection between 2 plant cells
Term
Integral Proteins
Definition
Proteins that span the entire lipid bilayer
Term
Peripheral proteins
Definition
located on the surface of the lipid bilayer. the amino acids that make up these proteins MUST have non-polar side chains
Term
Glycoproteins
Definition
the CHO part of the glycoprotein is made of an oligosaccharide that hangs outside the cell. this helps with cell-cell recognition
Term
Diffusion (passive transport)
Definition
movement of a substance from greater to lesser concentration
Term
Carrier mediated transport (facilitated diffusion)
Definition
facilitated diffusion Requires the assistance of a carrier protein (still passive)
Term
aquaporins
Definition
pores that allow water to move across the plasma membrane
Term
Active transport
Definition
movement of a substance against a concentration gradient (from low to high) this requires energy
Term
tonicity
Definition
measure of the total solute concentration
Term
First law of thermodynamics
Definition
energy cannot be destroyed or created
Term
2nd law of thermodynamics
Definition
Increase of entropy (entropy is a measure of randomness)
Term
Free energy
Definition
Portion of a system's energy that is ready o do work
Term
Exergonic
Definition
Energy out. DeltaG is negative (The chemical mixture loses energy), the reaction is spontaneous. Downhill
Term
Endergonic
Definition
Energy in. Delta G is positive, it's nonspontaneous. Uphill
Term
Hydrolysis of ATP
Definition
Water is Added to ATP, it is broken into ADP and an inorganic phosphate, yielding energy.
Term
Phosphorylation
Definition
adding an inorganic phosphate to a molecule
Term
Redox reaction
Definition
oxidation reduction reaction. this requires the movement of electrons to a more electronegative atom.
Term
Oxidation
Definition
The loss of an electron
Term
Reduction
Definition
Gain of an electron
Term
NAD+
Definition
the Oxidized form of NADH (NADH loses electrons to form NAD+). also known as the electron acceptor.
Term
NADH
Definition
Reduced form of NAD+ (NAD+ accepts an electron to become NADH)
Term
Glycolysis
Definition
Occurs in the cytosol. 1 glucose & 2 ATP are used, 2 ATP, 2 NADH, 2 H20, and 2 Pyruvate are yielded
Term
junction between Glycolysis & Krebs
Definition
Pyruvate moves into Mitochondrion- 1. C02 is released 2. NAD+--> NADH 3. Coenzyme A is added to make Acetyl CoA
Term
Krebs Cycle
Definition
Oxaloacetate is added to the incoming Acetyl CoA to make citrate and the cycle continues. for each Pyruvate (2 per glucose) the krebs cycle produces 2 C02, 3 NADH, FADH2, and 1 ATP. (AKA 6 NADH and 2FADH2 and 2 ATP)
Term
FADH2
Definition
only yields 2 ATP, compared to NADH which yields 3 ATP.
Term
REVIEW NOTES FROM 10/19
Definition
Term
Electron Transport Chain
Definition
a collection of molecules embedded in the inner membrane of the mitochondrion. NADH and FADH2 enter the chain and travel down to the last ion which is Oxygen (very electronegative). FADH2 provides 1/3 the energy of NADH. This produces a lot of H20
Term
Chemiosmosis
Definition
ATP synthase is powered by the flow of H+ ions back across the membrane into the mitochondrial matrix. the electron transport chain initially pumps H+ ions out into the intermembrane space so that the downward gradient powers enables ATP synthase to use the proton motive force to phosphorylate ADP forming ATP.
Term
Oxidative Phosphorylation
Definition
The electron transport chain pumping H+ ions into the intermembraneous space and then ATP synthase using chemiosmosis to harness energy from the flow of H+ back into the Mitochondrial matrix.
Term
ATP per glucose produced by Cell Respiration
Definition
4 by substrate level phosphorylation (2 in glycolysis and 2 in Krebs) and about 32 or 34 by Oxidative phosphorylation
Term
Anaerobic Respiration
Definition
Without the presence of Oxygen, electrons cannot be pulled down the electron transport chain. In Anaerobic respiration, a less electronegative molecule is substituted for Oxygen at the end of the ETC.
Term
Fermentation
Definition
under anaerobic conditions, Glycolysis plus reactions that occur to make NAD+ to fuel Glycolysis.
Term
Alcohol Fermentation
Definition
Pyruvate is converted to alcohol and CO2 and NAD+ are released
Term
Lactic acid fermentation
Definition
Pyruvate is reduced directly by NADH to form Lactate
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