cell structure and organisaton Flashcards
what is the role of lysosomes
contain digestive enzymes e.g lysosomes or white blood cells or acrosome in sperm cells
structure of mitochondria
has a double membrane where inner mem is highly folded into cristae.
role of the cytoskeleton
contain filaments that allow cell to contract and relax.
role of the nuclear envelope
double membrane containing pores acting as a barrier to harmful substances. It seperates DNA from cell contents. Pores allow movement of mRNA.
what is chromatin
contains DNA snd protein forming chromosomes.
what is the role of the nucleolus
makes rNA and ribosomes
what is the role of centriles
form spindles fibres during cell division and always found in pairs and made of microtubules
role of ER
interconnecting flattened sacs called cisternae and are membrane bound. Rough Er have ribosomes on and transports protein made on chromosomes around cell and to golgi.Smooth Er are flat membrane bound sacs but no ribosomes so are used in lipid and steroid synthesis.
what is the role of the golgi
flattened non-interconnected sacs.
receives protein from Er and packages them into vesicles.
-form glycoproteins for secretionand ends bud off to form secretary vesicles which transport substances in exocytosis.
role of ribosome
no mebrane and made of protein and rRNA divided into a large and small unit and is used in protein synthesis.
role of microvili
-only some animal cell have and have a large surface area for absorbtion.
describe chloroplasts
surrounded by a double membrane and have many internal mebranes , thylakoids that contain chlorophyll-absorbs light energy.
plasmodesmata are…
strands of cytoplasm that pass through gaps in the cell wall and allows easier movement of molecules.
