b2.2- organelles and compartmentalisation Flashcards
not organelles [3]
- cell wall
- cytoplasm
- cytoskeleton
organelles [4]
- nuclei
- vesicles
- ribosomes
- plasma membrane
study of individual organelles became possible when… [2]
- ultracentrifuges was invented
- methods of using them for cell fractionation was developed
adaptations of the mitochondrion for production of ATP by aerobic cell respiration [4]
- double membrane with a small volume of intermembrane space
- large surface area of cristae
- compartmentalisation of enzymes
- substrates of the Calvin cycle in the matrix
adaptations of the chloroplast for photosynthesis [4]
- large surface area of thykaloid membranes with photosystems
- small volumes of liquid inside thylakoids
- compartmentalisation of enzymes
- substrates of the Calvin cycle in the stroma
functional benefits of the double membrane of the nucleus [2]
- need for pores in the nuclear membrane
- for the nuclear membrane to break into vesicles during mitosis and meiosis
function of free ribosomes
site for translation to make intracellular protein in the cytoplasm
eg. cytoplasm, lysosomes, mitochondria, chloroplasts and nucleus
function of rough ER
proteins exported for use outside of cell
structure and function of vesicles in cells
- small, membrane-bound cell structures
- transport and storage of materials
structure of Golgi apparatus
stack of flattened, membrane-bound sacs
electron micrograph:
- stack of sacs with no interconnection
- budding off vesicles often see
function of Golgi apparatus in processing and secretion of protein
modify and package protein into vesicles
role of clathrin in the formation of vesicles
- forms cage like structure through polymerisation of multiple clathrin molecules around the area of a membrane
- membrane starts to invaginate-> clathrin surround invagination and forms a clathrin coated pit
- acts as a scaffold for the formation
- brings together necessary molecules needed to shape and pinch off a piece of the membrane to form a vesicle - breaks down through hydrolysis back to individual pieces
clathrin
- small, membrane-bound cell structures
- transport and storage of materials
electron micrograph: made of phospholipid layer
types of vesicles [4]
- transport
- secretory
- lysosomes
- peroxisomes
function of ribosomes
translate mRNA from the nucleus into proteins
advantages of compartmentalisation to eukaryotes [4]
- provides optimum local conditions and enzymes for metabolic reactions
- shorter particles movement needed
- concentration gradient can be generated more easily
- more specialisation within the cell- allows more complex + defined cell functions to take place
function of outer membrane
separate the content of mitochondrion from the rest of the cell
function of inner membrane + cristae
- electron transport chain reaction for respiration
- contians enzyme
eg. ATP synthease (to make ATP)
inner membrane + cristae increases efficiency by
increase surface area for oxidative phosphorylation
function of matrix
contain enzymes for Kreb cycle and link reaction
matrix increases efficiency by
presence of respiratory enzymes
function of mitochondrial DNA and ribosomes
- expression of mitochondrial genes
- can grow and reproduce
mitochondrial DNA and ribosomes increases efficiency by
- contains mitochondrion DNA
- shows maternal ancestor lineage
function of inter-membrane space [3]
- protons are pumped into the spaces by electron transport chain
- acts as a buffer between cytoplasm + matrix
- allows for regulation of exchange of material between the two compartments