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BIOL 235 - Chapter 3 (161 questions already graded A+).
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BIOL 235 - Chapter 3 (161 questions already graded A+).
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BIOL 235 - Chapter 3 (161questions already graded
A+)
3 main components of a cell - answer living
structural/functional units that have unique roles
(plasma membrane, cytoplasm, nucleus)
structure/functions of plasma membrane - answer
cell's outer surface; separates the internal/external
environments with a selective barrier that
regulates flow of materials
main components of cytoplasm - answer all
cellular contents between plasma membrane and
nucleus
cytosol (intracellular fluid)
organelles (each have a characteristic
shape/function)
main components of nucleus - answer organelle
houses the cell's DNA; (chromosome: single DNA
molecule containing genes: hereditary units
controlling cell structure/function)
,fluid mosaic model - answer structural model of
plasma membrane (fluid lipids with a mosaic of
proteins floating or anchored)
lipid bilayer - answer made of 2 layers of
amphipathic lipid molecules (hydrophilic heads
facing out, hydrophobic tails facing in); contains
phospholipids, cholesterol, glycolipids
phospholipids - answer contain phosphorus
(compose 75% of membrane lipids)
cholesterol - answer steroid with attached OH
(hydroxyl) group (20%)
glycolipids - answer lipids with attached
carbohydrate groups (5%)
4 types of membrane proteins - answer Integral:
firmly embedded, amphipathic
Transmembrane: protrude into
cytosol/extracellular fluid
Peripheral: not firmly embedded, attach to polar
heads
, Glycoprotein: have carbohydrate groups and
glycocalyx (sugary coating)
integral proteins - answer extend into or through
the lipid bilayer and are firmly embedded in it
transmembrane proteins - answer integral
proteins that span entire lipid bilayer and protrude
into both the cytosol and extracellular fluid
glycoproteins - answer proteins with
carbohydrate groups attached to the ends that
protrude into extracellular fluid
glycocalyx - answer sugary coat of carbohydrate
portions of glycolipids/glycoprotens
peripheral proteins - answer not as firmly
embedded in membrane, attached to the polar
heads of membrane lipids or to integral proteins at
the inner/outer surface of the membrane, can
serve as enzymes and linkers
6 functions of membrane proteins - answer ion
channel
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