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overview of cells


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structural units of all living things
about how many cells do we have
50 to 100 trillion
Hooke said all living things are composed of cells
what are the four concepts of cell theory
a cell is the structural unit of all living things

an organisms activity depends on the individual and the collective activities of its cells,

biochemical activities of cells are dictated by subcellular structures

life continues cuz of cells
biochemical activies of cells are determined by subcellular structures, what is this called
principle of complementarity
loss of cellular homeostasis underlies some diseases
F, all disease
a cell's shape reflects its
All cells have the same basic parts
what is a composite cell
a generallized cell, like the drawing of your typical cell in the book
some organelles are enclosed in a membrane
F, nearly all
why is it called the fluid mosaic model?
a thin layer of repeating molecules has embedded proteins that have a constantly changing mosaic pattern
of the fatty substances, what are the basic chemicals they are composed of
phospholipds, cholesterol, and glycolipids
what part of the phospholipid likes water
the head, the tail is fat loving
the main constituent of extracellular fluid is
all biological membranes form a sandwich like structure
can the cell membrane self assemble itself easily when disturbed
yes cuz the hydrophobic tales position themselves away from the water
the majority of membrane phospholipids are saturated
f, unsaturated
what are glycolipds
phospholipids with a sugar group attached
where do you find glycolipds
on the outside of the cell membrane
20% of the cell membrane is ...while 5% of it is
20% cholesterol, 5% glycolipds
what are lipid rafts
quilt like patches of phosphlipds that are saturated and therefore more stable and less fluid
lipid rafts are areas for .....
cell signalling
half of the cell membrane mass
what molecules are responsible for most of the activity of a cell membrane
most integral proteins are
transmembrane proteins and protude on both sides
all transmembrane proteins have ... and .... regions
hydrophobic and hydrophilic regions
what functions do transmembrane proteins have
carriers, channels, relay messages (signal transduction)
peripheral proteins are embedded in the lipid
False, attach loosely to integral proteins or membrane lipds
what functions do peripheral proteins do
enzymes or mechanical functions like cell shape or contraction, or link cells
what kind of proteins are common out extracellular space
carbohydrate rich area at the cell surface
the glycocalyx are different for each cell type
glycocalyx can serve as biological markers
the plasma membrane is not a dynamic structure and is relatively constant
F, dynamic fluid like olive oil
what kind of movements can the phospholipids do
cannot flip flop, but can move from side to side
increase the surface of the plasma membrane
fingerlike extensions of the plamsma membrane
how can cells stick together
glycocalyx, membrane junctions, wavy contours of the membrane, fit like two pieces of puzzle
in a tight junction what is holding the cells fused together
integral proteins
is the tight junction permeable
what are the three types of cell junctions
tight, gap, and desmosomes
describe a desmosome junction
kinda like two cells held together by stiches, like teeth of a zipper (linker protein molecules)
in additon to the linker proteins joining these cells what other function does it serve
to distribute tension to avoid stuff from pulling
what kinds of cells u see desmosomes in
heart, muscles, tissues subject to great mechanical stress
are gap junctions really tight
no, let stuff pass through
how are cells connected at gap junctions
by tubes call connexons
where do u find gap junctions
in electrically excitable tissues
what is interstitial fluid
extracellular fluid
what can u find in extracellular fluid
vitamins, fatty acids, wastes, hormones, sugars, amino acids, salts,

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