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human chromosomesthe normal diploid 2n chromosome number in human being is 46it was given by th tjio and a levan in 1956the chromosome complement of
supernumerary or accessory chromosomeswilson 1905 discovered them in matapodium insectvery small chromosomes present in nucleus in addition to normal
theories to explain fine structure of chromosome1 multistranded theorysteffenson 1959 - each chromosome composed of two chromatids half chromosome
karyotypeexternal morphology of chromosomes specific for each species of living organismskaryotype can be studied in metaphase of mitosiskaryotype
numberbenden and boveri first indicated that number of chromosomes is definite in each organism1 haploid n - one set of chromosomes ie one chromosome
chromosomeskarl nageli and hofmeister observed chromosomes in pollen mother cells of tradescantiachromosome name proposed by waldeyerduring cell
intermediate filamentsthese are non-living structuresmade up of different types of protein eg keratin synemin desmin and vimentinthese are divided
microfilamentsdiscovered by pelvitzthese are smallest cell structurethese are non-living structuresthese are solid structures consists of actin
compare and contrast the structure of the following hyrda plain hydra mematocysts obelia amoeba euglena paramecium caudatum conjugation euglena
sirmadam i am a banquet farm owner and face the problem with the grass that in november amp december the grass does not grow well or disappear
you tested three different treatments for ripening bananas before you did the lab which one did you think would have ripened most state your
why is it necessary to have the second division in meiosis even though cells have already been reduced to haploid number after the first
microtubulesdiscovered by de robertis and franchiterm given by slautterbackthese are hollow structures consists of tubulin proteineach protein diamer
functionin animal cells centrioles play important role in initiation of cell division by arranging spindle fibres between two poles of cellthus they
microbodiessingle unit membrane bound small spherical structuresmicrobodies are structurally related to lysosomeon the basis of functions microbodies
vacuolesthey are of 4 types -1 sap vacuole -outer membrane of sap vacuole is called tonoplast sap vacuole contains amino
aleurone grains -also known as plant lysosome because they contain hydrolytic enzymesconsists of proteinsthey are also known as aleuroplast because
sphaerosomealso known as plant lysosome because they contain hydrolytic enzymeshanstein first observed them and called microsomesdiscovered by
chemical composition of chromatinchromatin threads composed of dna 31 rna 2-5 and proteins histon-36 non histon 28histone and protamines are basic
nucleoplasm or karyoplasm or karyolymph or nuclear sapnucleoplasm and cytoplasm name proposed by e strassburger chemical composition of nucleoplasm
nucleus -largest component of the cellnucleus is double membrane bound dense protoplasmic body that controls cellular metabolism enclose all the
difference between ribosome and plant virus - ribosome rna protein plant virus rna protein 1 does not multiply 2 here more than
forms of ribosomes1 bound form - attached to er protein synthesis for secretion purpose occurs on bound
ribosomes -it is also known as protein factory engine of the cellribosomes are smallest cell organelles 150 x 250 aringunit membrane less cell