Bio: Cells Flashcards
cell
organizational unit of life
cell membrane
keeps the cell together, made of lipids
passive transport
substances move down concentration gradient, requires no extra energy
active transport
substances are moved against the concentration gradient, requires ATP
diffusion
solute moves from an area of high concentration to low concentration
osmosis
transportation of H2O across concentration gradient
hypertonic
greater amount of solute surrounding the cell, water rushes out
hypotonic
less solutes outside cell, cell pulls water in
isotonic
balanced amount of solute in and out of the cell
filtration
pressure forces water and its solutes through a membrane
facilitated diffusion
carrier meditated, a variation of diffusion where protein channels assist with transport (highly specific)
endocytosis
intake of liquid and solid particles too large to cross the cell membrane
exocytosis
transport out of the cell
cytoplasm
gelatinous liquid that fills the inside of a cell
nucleus
contains chromosomes, surrounded by double walled nuclear membrane
nucleolus
produces ribosomes, found inside nucleus
DNA
double stranded–carrier of genetic information
RNA
single stranded–carrier of genetic information
mRNA
responsible for protein synthesis
endoplasmic reticulum
series of channels from folded membranes
rough ER
responsible for synthesis of protein, lined with ribosomes
smooth ER
produces lipids and steroids
ribosomes
produce enzymes and proteins, made of RNA
centrosomes
contain centrioles
centrioles
creates spindles for cell division
mitochondria
producer of ATP
aerobic respiration
catabolism of nutrients to CO2, water, and energy, involves electron transport system
glycolysis
breakdown of glucose molecule, occurs in the cytoplasm, doesn’t require oxygen