cell structure Flashcards

1
Q

why is a cell there structural, functional and fundamental unit of life

A

because anything less than s complete cell does not ensure independent living

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2
Q
A
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3
Q

who described the first live cell

A

Anton von leeuwenhoek

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4
Q

who discovered the nucleus

A

Robert brown

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5
Q

who discovered the first cell

A

Robert hooke

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6
Q

Matthias Schleiden, a German botanist,stated that

A

all plants are composed of different kinds of cells which form the tissue of the plants

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7
Q

Theodore shwann, a British zoologist discovered that

A

animal cells had an thin outer layer known as plasma membrane, the presence of cell wall is unique character of plant cells

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8
Q
A
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9
Q

Schwann proposed the hypothesis that

A

bodies of animals and plants are composed of cells and products of cells

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10
Q

who formulated the cell theory

A

Schleiden and schwann

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11
Q

limitation of cell theory

A

did not explain how new cells were formed

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12
Q

who modified the cell theory

A

Rudolf virchow

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13
Q

what modification did rudolf virchow bring to the cell theory

A

first explained that cells divided to form new cells from pre existing cells(omnis cellula-e-cellula)

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14
Q

cell theory

A

all living organisms are composed of cells and products of cells, all cells arise from pre-existing cells

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15
Q
A
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16
Q

a typical plant cell has an outer boundary of

17
Q

within the cell wall, in plant cells is

A

plasma membrane

18
Q

animal cells have a outer delimiting structure of

A

plasma membrane

19
Q

inside each cells, there is a

A

dense membrane bound structure called nucleus

20
Q

the nucleus holds

A

chromosomes which contain genetic material, dna

22
Q

cells without a membrane bound nucleus

A

prokaryotic

23
Q

cells with a membrane bound nucleus

A

eukaryotic

24
Q

in both prokaryotic and eukaryotic cells, the matrix consists of

A

a semi fluid called cytoplasm

25
main arena of cellular activities
cytoplasm
26
how does the cytoplasm keep the cell in living state
chemical reactions occur in cytoplasm
27
28
eukaryotic cells contain other membrane bound cells like
mitochondria, golgi complex,lysosomes, ER, microbodies, vacuoles
29
ribosomes are
non membrane bound organelles found in both eukaryotic and prokaryotic cells
30
ribosomes are found in
cytoplasm, chloroplasts, mitochondria and rough er
31