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chapter 5
41
Biology
Post-Graduate
02/10/2011

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Term
cells control their chamical enviroment using
Definition
energy . enzymes, the plasma membrane
Term
energy
Definition
is defined as the capacity to perform work
Term
kinetic energy
Definition
 is the energy of motion
Term
potential energy
Definition
 is stored energy
Term
machines and organisms can
Definition
transform kinetic energy to potential energy and vise versa
Term
conservation energy
Definition
energy can't be created or destroyed
Term
entropy
Definition
 scientists use this term as a measure of disorder, or randomness
Term
heat
Definition
is type of kinetic energy, product of all energy conversions
Term
chemical energy
Definition
molecules store varying amounts of protential energy  in the arrangement of their atoms
Term
cellular respiration
Definition
 is the energy releasing chemical breakdown of fuel molecules that provides energy for cells to do work
Term
chemical energy is released
Definition
 by the breakdown of organic molecules during cellular respiration
Term
ATP
Definition
adenosine triphosphate
Term
ATP
Definition

acts like an energy shuttle

stores energy obtained from food

releases it later as needed

Term
ATP energizes other molecules by
Definition
transferring phosphate groups
Term
energy helps cells perform
Definition

mechanical work

transport work

chemical work

 

Term
the ATP cycle
Definition
is recycled from ADP and a phosphate group through cellular respiration
Term
a working muscle cell spends and recycles about
Definition
10 million ATP molecules per second
Term
metabolism
Definition
 is the total of all chemical reactions in an organism
Term
enzymes
Definition
 proteins that speed up chemical reactions
Term
other enzyme inhibitors
Definition

blind at a remote site

change the enzyme's shape

prevent the enzyme from binding to it's substrate

Term
molecules contain heat energy 
Definition
that causes them to vibrate and wander reandomly
Term
diffusion
Definition
is the tendency for molecules of any substance to spread out into the available space
Term
passive transport
Definition
 is the diffusion of a substances across a membrane without the imput of energy
Term
concentration gradient
Definition
 a region  in which the substance's density changes
Term
osmosis
Definition
 the diffusion of water across a selectively permeable membrane
Term
hypertonic
Definition
 solution had higher concentration of solute
Term
hypotonic
Definition
solution has a lower concentration of solute
Term
isotonic
Definition
 solution has equal concentration of solute
Term
osmoregulation
Definition
 is the control of water of water balance within a cell or oragnism
Term
most animal cells required
Definition
an isotonic enviroment
Term
plants cells require a ________ which keeps these walled cells turgid
Definition
hypotonic enviroment
Term
active transport
Definition
requires energy to move moleclues across a membrane
Term
exocrytosis
Definition
is the secretion of large molecules within vesicles
Term
endocytosis
Definition
takes material into a cell within vesicles that bud inward from the plasma membrane
Term
three types of endocytosis
Definition
phagocytosis, pinocytosis, receptor mediated endocytosis
Term
phagocytosis
Definition
cellular eating) a cell engulfs a particle and packages it within food vacuole
Term
pinocytosis
Definition
 cellular drinking),  a cell gulps droplets of fluid by forming tiny vesicles
Term
receptor mediated endocytosis
Definition
a cell takes in very specific molecules
Term
the plasma membrane helps convey signals between
Definition
 cells, cells and their enviroment
Term
signal transduction pathways
Definition
relay the signal, convert it to chemical forms that can function within the cell
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