cell structure and function Flashcards
exam 1
functions of the cell
basic unit of life
protection, support
allows muscles to contract
allows for heat production
contains rna/dna copies
plasma membrane purpose
determines what moves in/out of the cell, maintains membrane potential
plasma membrane components
glycolipids
glycoproteins
membrane lipids
determine the structure of plasma membrane
lipid bilayer
component of the plasma membrane consisting of hydrophilic polar and hydrophobic nonpolar heads
what determines the fluid nature of the membrane
cholesterol
membrane proteins
determines some function of the membrane, can be integral/intrinsic or peripheral/extrinsic
peripheral/extrinsic
refers to the membrane protein attaching to the outer/inner surfaces of the bilayer, peripheral usually attached to intrinsic
marker molecules
type of membrane protein that allows cells to id one another and other molecules
integral/intrinsic
refers to the membrane protein stretching from one surface to the other
attachment site
membrane proteins that anchor to other cells or extracellular molecules
channel proteins
membrane proteins that form passageways through the plasma membrane, allowing specific molecules/ions to pass through
receptors
membrane proteins that function as binding sites for chemical signals in the extracellular membrane
carrier
membrane protein that move ions through the plasma membrane
enzymes
membrane proteins that catalyze chem rxns inside/outside the cell
diffusion
movement of solutes from high to low concentration in a solution
osmosis
diffusion of water across selectively permeable membrane
isotonic, hypertonic, hypotonic
iso=neutral
hyper=shrinks
hypo=swells
filtration
movement from side of greater pressure to side of lesser pressure
mediated transport mechanisms
involve the use of carrier proteins
facilitated diffusion
type of mediated transport where carrier proteins move the substance w/out the use of atp
active transport
type of mediated transport where atp powered pumps bind to substances and move them along the membrane
endo/exocytosis
endo: internalization of a substance by formulation of a vesicle
exo: excelles accumulated vesicle secretions
phago vs pinocytosis
phago: breaks molecule into particles
pino: breaks molecule into liquid
cytoplasm components
cytosol: fluid portion
cytoskeleton: structure, holds organelles
cytoplasmic inclusions: chemicals produced/ taken in by the cell
centrioles
consist of microtubules, become spindle fibers during mitosis
cilia
appendages projecting over cell surfaces that move material over the surface
flagella
long, similar to cilia, move in a wavelike fashion
microvilli
extension of plasma membrane that increase the cell surface
ribosomes
site of protein synthesis
endoplasmic reticulum
rough: produces/modifies protein
smooth: manufactures lipids
Golgi apparatus
modifies, packages, distributes protein/lipids (which create lysosomes)
peroxisomes/proteasomes
perox: contain enzymes to break down fatty/amino acids
protea: large protein complexes that recycle proteins
mitochondria
provides energy for the cell, major site of atp synthesis
nucleus components
nuclear envelope, chromatin, nucleolus