definitions Flashcards
eukaryotic cells
more complex, membrane bound nucleus, organelles carry out biochemical processes, unicellular or multicellular, animal or plant cell
prokaryotic cells
lack a nucleus, single DNA structure, unicellular, bacteria or archaea
SA:V ratio
smaller cells have a quicker rate of diffusion as molecules travel less distance, increasing metabolic efficiency
major groups of molecules
protein, lipid, carbohydrates, nucleic acids
protein
growth and repair, enzymes
lipids
store energy
carbohydrate
energy source
nucleic acid
genetic code which controls cell function
aerobic respiration
requires oxygen, common
glucose + oxygen –> carbon dioxide + energy
anaerobic respiration
occurs when there’s a lack of oxygen
glucose –> lactic acid + energy
photosynthesis
- light stage - dependent on light
- carbon fixation stage - uses CO2
CO2 + water –> glucose + oxygen
( require light energy and chlorophyll)
diffusion
movement of molecules from high concentration to low concentration across a semi-permeable membrane
concentration gradient
difference in concentration between 2 areas, bigger = faster diffusion
facilitated diffusion
when carrier protein and protein channel assist large molecules move across a membrane
osmosis
movement of water molecules from high to low water concentration (from low to high solute concentration)