the cell Flashcards
what are cells
units that make up organisms
how do cells increase in number
cell division
mitosis in my toes
meiosis in my ovaries
what is a nucleoid
a concentration of DNA
what is an endoplasmic reticulum
a network of membranous tubules within the cytoplasm of a eukaryotic cell
Rough: ribosome studded for protein synthesis Smooth: synthesis of membranes lipids, etc.
what is a plasma membrane
membrane around a cell
what is a lysosome
a digestive organelle
what is a mitochondrion
organelle that generates ATP from products of metabolism
what is a Golgi apparatus
a complex of vesicles and folded membranes within the cytoplasm of most eukaryotic cells, involved in secretion and intracellular transport.
what are the events in the endosymbiotic theory
prokaryotes.
One picked up a mutation. membrane production went into overdrive.
membrane began to fold causing wrinkles. Surrounded a nucleoid and resulted in a nuclear membrane.
remainder of the membrane starts to become specialised.
Membrane bound organelles form except from mitochondria.
what suggests that mitochondria were once a cell in their own right
Mitochondria have and double membrane and their own DNA.
Diffusion: Time α …………..^2
distance
what are microtubules
hollow tubes made of tubulin dimers composed of Beta and alpha tubulin
what are microfilaments
two intertwined strands of actin
what are intermediate filaments
fibrous proteins coiled into cables
what are temporary cytoplasmic extensions called
pseudopodia
