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Bio Test
test over Organismal Biology Cecie Starr ch 4 5 6
87
Biology
Undergraduate 1
02/17/2009

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Term
Endoplasmic reticulum (ER)
Definition
interconnected tubes and flattened sacs
Term
Endoplasmic reticulum (ER)
Definition
begins at nucleus and winds through cytoplasm
Term
Endoplasmic reticulum (ER)
Definition
It has two regions: Rough and smooth
Term
ROugh ER
Definition
RIbosomes attached to outer surface
Term
Rough Er
Definition
Ribosomes make polypeptide chains
Term
Smooth Er
Definition
Ribosome free
Term
Smooth Er
Definition
produces lipids for cell membrane
Term
Smooth Er
Definition
fatty acid and carbohydrate breakdown
Term
Smooth Er
Definition
degrades toxin
Term
golgi bodies
Definition
vesicles containing proteins and lipids (from ER) fuse with Golgi bodies
Term
golgi bodies
Definition
attach sugar side chains to proteins and lipids from er (make into proteins and enzymes)
Term
golgi bodies
Definition
package products in vesicles
Term
vesicles
Definition
lysosomes & peroxisomes
Term
lysosomes
Definition
bud from golgi bodies, digest biological molecules eat old cells
Term
peroxisomes
Definition
break down fatty acids, amino acids, has hydrogen peroxide which degrades alcohol
Term
cell junctions
Definition
site where cells send and receive signals or aterials or where cells attach to other cells
Term
cell junctions
Definition
in plants they are called plasmodesma (channel) connects cytoplasm of adjacent cells
Term
animals
Definition
have no cell walls, surrounded by a matrix of cell seretions (carbs and proteins)
Term
Three types of cell junctions in animals
Definition
tight, adhering, and gap
Term
Tight cell junction
Definition
link cells of body tisue (waterproof like in stomach)
Term
adhering cell junction
Definition
a junction that joins cells in skin and heart to aavoid stretching
Term
gap cell junction
Definition
a junction that is a small open channel that link cytoplasm of adjacent cells (heart)
Term
cytoskeleton of cell
Definition
a system of proteins and filaments between the nucleus and plasma membrane that reinforce, organize and move internal parts
Term
microtubules
Definition
are composed of the protein tubulin
Term
microtubules
Definition
are involved in shape, motility and cell division (move chromosoes, cloroplasts and vesicles
Term
microfiliments of the cytoskeleton
Definition
are composed of the protien actic
Term
microfiliments of the cytoskeleton
Definition
maintain cell shape
Term
microfiliments of the cytoskeleton
Definition
involved in cell cleavage and muscle contraction
Term
Intermediate filiments of cytoskeleton
Definition
they streghten and maintain shape of cell
Term
Intermediate filiments of cytoskeleton
Definition
compose the nails, animal horns and hair
Term
Intermediate filiments of cytoskeleton
Definition
reinforce nuclear envelope
Term
__________ and ___________ grow or diminish in legnth
Definition
microtubales, microfiliments
Term
Mysosin and kinesin
Definition
_________ and __________ are involved in motor proteins that use ATP to move cell parrts, kinesin moves chloroplast towards light
Term
external microtubles
Definition
flagella (long whip-like)
Term
external microtubes
Definition
cilia (short, pseudopods)
Term
phospholipids
Definition
have phosphate head with two fatty acid tails, tail being hydrophobic and head being hydrophilic
Term
fluid mosiac model
Definition
the cell membrane i represented as having a mixed composition inclkudign phospholipids, proteins, steroids, and glycolipids
Term
integral proteins
Definition
span entire membrane
Term
peripheral preoteins
Definition
are on membrane surface
Term
mitocodria
Definition
produce atp through aerobic respiration
Term
mitochondria
Definition
have two cell membranes, outer and inner (reatews compartment for ion flow)
Term
mitochondria
Definition
have own DNA and ribosomes
Term
mitochondria
Definition
divide independently
Term
plastids
Definition
function in photosynthesis or storage
Term
chloroplasts
Definition
specialized for photosynthesis
Term
chloroplasts
Definition
two outer membranes
Term
chloroplasts
Definition
have innter fluid--stroma
Term
chloroplasts
Definition
have thylakoid membrane (flattened disked called grana, contain chlorophyll)
Term
chloroplasts
Definition
contain their own DNA and ribosomes
Term
chromoplasts
Definition
no chlorophyll
Term
chromoplasts
Definition
no chlorophyll
Term
chromoplasts
Definition
have cartenoids (range from red to yellow, make leaves turn brown/yellow in fall)
Term
amyloplasts
Definition
no pigments
Term
amyloplasts
Definition
store starch
Term
amyloplasts
Definition
gravity sensing
Term
central vacuole
Definition
stores amino acds, sugards, ions, toxic wastes and water (wista0
Term
Central vacuole
Definition
expands cells (50-90% of cell space)
Term
protozoans, fungi,plants
Definition
what groups have cell walls?
Term
cell wall
Definition
protects and physically supports a cell and is pourous
Term
plant cell primary wall
Definition
connects abutting cells, cellulose
Term
plant cell secondary wall
Definition
reinforces shape, called lignin in woody species
Term
hydrostatic pressure
Definition
the pressure that any volume of fluid exerts against a cell wall or membrane
Term
osmotic presure
Definition
the amount of hydrostatic pressure that can stop water from diffusing nto cytoplasmic fluid
Term
hydrostatic
Definition
(osmotic) no movement
Term
metabolism
Definition
cel's ability to aquire energy and use it to build, degrade, store and release substance in controlled ways
Term
energy
Definition
capacity to do work
Term
1st law of thermodynamics
Definition
energy cannot be created or destroyed
Term
potential energy
Definition
stationary objects capacity to do work
Term
kinetic energy
Definition
energy of motion
Term
cells use energy for
Definition
respiration, photosynthesis
Term
2nd law of thermodynamics
Definition
energy tends to flow from high energy forms to low
Term
entropy
Definition
a measure of how much and how far a concentrated form of energy has been dispersed after an energy change
Term
energy is lost as
Definition
heat
Term
reactats
Definition
molecules that enter a reation
Term
products
Definition
molecules that remain at the end of a reaction
Term
participants in reactions are
Definition
energy carriers, enzymes, cofactors
Term
endergonic reactions
Definition
energy input is required, product has more energy than starting substances (photosynthesis is ex)
Term
endergonic reactions
Definition
energy rele4ased, products have less energy than starting substances (respiratio)
Term
all cells make
Definition
atp
Term
atp
Definition
adenonine triphosphate
Term
atp
Definition
donates phospate groups to other molecules (enables them to react, accepts energy from exergtonic reations, donates energy to endergonic reactions
Term
The four features of enzymes
Definition
do not make anything happen that couldn't happen w/out the enzyme, the same enzyme usually works for foward and reverse reactions, each type of enzyme recognizes and binds to only specific subtrates
Term
enzymes
Definition
lower activation energy
Term
induced fit model
Definition
substrates dont fit perfectly so enzymes stretch/squeeze substrates into shape
Term
transition state
Definition
the point when reactions spontaneously run to product
Term
cofactors
Definition
ncessary in enzyme function, accepts e-, H+ and functional groups
Term
enzyme helpers are
Definition
antioxidents (neutralize free radicals, atoms with at least one unupaired electron (attack DNA structure) catalase
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