Ch. 3-4 Flashcards
Cell theory states:
- cell is basic unit of structure & function in living things 2.smallest unit that performs all vital functions 3. new cells come from pre existing cells
cell (plasma) membrane
outer boundary of the cell
cytoplasm
holds the cellular organelles
nucleus
control center of the cell
cellular organelles
performs specific functions of the cell
membrane structure =
fluid mosaic model
allows only certain substances to enter and leave the cell
selectively permeable
the cell membrane is _____ ______
selectively permeable
cell membrane is composed of a ___ ____ of phospholipid molecules with many protein molecules dispersed within it
double layer
the surfaces of the membrane are _____ due to the polar phosphate heads
hydrophilic
the internal portion of the membrane is ____ due to the non polar fatty acid tails
hydrophobic
hydrophilic
water loving
hydrophobic
hate water
act as receptors, recognizes something else
carbohydrates
keeps membrane fluid, part of cell membrane, 2 kinds
cholesterol
connect adjacent cell membranes(when cells are in contact with one another)
intercellular junctions
3 types of junctions:
1 tight 2 desmosomes 3 gap
prevent moment of substances in between cells ex. blood brain barrier, bound all the way down
tight junctions
structural reinforcement (spot wielding) cell membranes are attached to one another at various sites
desmosomes
allow substances like ions to pass from cell to cell for communication (cardiac muscle)
gap junctions
cyto=
cell
space between the cell membrane and the nucleus, 70% of the cell, holds organelles
cytoplasm
the jelly-like fluid of the cytoplasm and occupies the space between the nucleus and the cell membrane,mostly water
cytosol
central core; control center, houses DNA
nucleus