Make Your Own Paper Snowflakes by Peggy Edwards

By Peggy Edwards

All you wish is a couple of scissors and you may make attractive snowflake paper cut-outs.

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Lysosom es a nd secre tory gran ules, for instan ce, a re derived bios yntheti call y from th e Golgi com plex. But how do new Golgi complexes form, or new endo plasmic reticulum ? 7 The endosymbiont hypothesis of organelle evolution On at least th ree occasio ns in the d ista n t past , pro karyotic organisms ar e th ou ght to ha ve formed a symbio tic relationshi p with a primo rdia l eu ka ryotic cell. Separa te evo lution of th e endosym bionts gave rise to the pr esen t-da y perox isom es, mi tochondria, and chloroplasts .

Singl e-stranded DNA will hybridise ( by base-pairing ) with a pol ynucleotide chain (either DNA or RNA ) of com pleme ntary base sequence. Genes maybe cloned in the form of a complementary DNA (cDN A ) library or a more com plex genomic (chromosomat) DN A library. Sinc e eD NA is prepared from messenger R NA , it lacks the introns and the flanking control regions that are present in genomic DNA.

Microfilaments - aggregates of actin monomers forming 7 nm diameter filaments. Bundles of microfilaments may run parallel to th e long axis of th e cell. Intermediate filaments - a famil y of protein assemblies (coiledcoil structures roughl y 10 nm in diamet er ) and including the ker atins and the neurofilaments, among others. Different classes of intermedi ate filam ents a re found in differ ent tissues. 2 ) are gen etically related to the cytoplasmic intermediate filament proteins. 1 ). But what are their functions?

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