Form 4 Term 1 Biology Unit 15 - Cells Membranes and Movement Flashcards
Osmosis
MOVES WATER MOLEULeS
DOESNT NEED EERGY
net movement of water molecules from a region of high water potential to area of low water potential through a partially permeable membrane
diffusion
net movement of particles from areas of high concentration to area of low concentration
eg packed together to spread out
solid diffusing out to gas
active transport
movement of particles through a cell membrane from a region of lower concentration to an region of higher concentration using energy
process requires energy to move molecules against concentration gradient (like up a hill)
photosynthesis
process by which plants and some bacteria synthesis food molecules which they use for respiration
process needs energy - usually from the sun
equation for photosynthesis
carbon dioxide plus water [sunlight and chlorophyl] - equals glucose and oxygen
what do you need in a cell for photosynthesise
chlorophyl
respiration
chemical processes that break down nutrient molecules in living cells to release energy
what carries oxygen arounds you blood
haemoglobin
gas exchange
process where gas and oxygen is exchanged for carbon dioxide across a membrane surface
main part of animal cells
nucleus, cell membrane. cytoplasm
animal cells do not have ….
a cell wall
no chloroplast - so no photosynthesis
living organisms have 7 characteristics
MRSGREN
what’s only in plant cells not animal cells
cell wall, chloroplast, vacuole
plus: cell membrane, nucleus and cytoplasm
cytoplasm
where chemical reactions happen - contains organelles
nucleus
contents the genetic material - DNA
controls the entire cell
cell membrane
controls the movement of substances in and out of the cell
cell wall
made from cellulose and strengthens the cell and supports the plant
mitochondria
where energy is released in respiration
ribosomes
where protein synthesis happens