cell structure Flashcards
why is a cell there structural, functional and fundamental unit of life
because anything less than s complete cell does not ensure independent living
who described the first live cell
Anton von leeuwenhoek
who discovered the nucleus
Robert brown
who discovered the first cell
Robert hooke
Matthias Schleiden, a German botanist,stated that
all plants are composed of different kinds of cells which form the tissue of the plants
Theodore shwann, a British zoologist discovered that
animal cells had an thin outer layer known as plasma membrane, the presence of cell wall is unique character of plant cells
Schwann proposed the hypothesis that
bodies of animals and plants are composed of cells and products of cells
who formulated the cell theory
Schleiden and schwann
limitation of cell theory
did not explain how new cells were formed
who modified the cell theory
Rudolf virchow
what modification did rudolf virchow bring to the cell theory
first explained that cells divided to form new cells from pre existing cells(omnis cellula-e-cellula)
cell theory
all living organisms are composed of cells and products of cells, all cells arise from pre-existing cells
a typical plant cell has an outer boundary of
cell wall
within the cell wall, in plant cells is
plasma membrane
animal cells have a outer delimiting structure of
plasma membrane
inside each cells, there is a
dense membrane bound structure called nucleus
the nucleus holds
chromosomes which contain genetic material, dna
cells without a membrane bound nucleus
prokaryotic
cells with a membrane bound nucleus
eukaryotic
in both prokaryotic and eukaryotic cells, the matrix consists of
a semi fluid called cytoplasm
main arena of cellular activities
cytoplasm
how does the cytoplasm keep the cell in living state
chemical reactions occur in cytoplasm
eukaryotic cells contain other membrane bound cells like
mitochondria, golgi complex,lysosomes, ER, microbodies, vacuoles
ribosomes are
non membrane bound organelles found in both eukaryotic and prokaryotic cells
ribosomes are found in
cytoplasm, chloroplasts, mitochondria and rough er
