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Botany > Cell: unit of life > Flashcards

Cell: unit of life Flashcards

1
Q

Who studied/discovered dead cells?

A

Robert Hooke

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2
Q

who discovered living cells

A

Anton Von Leeuwenhoek

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3
Q

who discovered the nucleus of the cell?

A

Robert Brown

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4
Q

Cell theory was given by

A

schleiden & schwann

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5
Q

who modified the cell theory

A

Rudolf Virchow

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6
Q

_______ is the main arena of cellular activities

A

cytoplasm

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7
Q

non-membrane bound organelle present in animal cells

A

centrosome

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8
Q

centrosome helps in ___________

A

cell division

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9
Q

name the smallest cell

A

mycoplasma

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10
Q

name the largest cell

A

ostrich egg

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11
Q

name the longest cell

A

nerve cell

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12
Q

what is the size of bacteria

A

3-5 μm

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13
Q

what is the size of human RBC

A

7 μm

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14
Q

what is the size of typical bacteria

A

1-2 μm

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15
Q

what is the size of PPLO

A

0.1 μm

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16
Q

PPLO is a type of ____________________

A

Mycoplasma

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17
Q

what is the size of virus

A

0.02-0.2

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18
Q

give few examples of prokaryotic cells

A

bacteria
blue-green algae
mycoplasma
PPLO

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19
Q

name four basic shapes of bacteria

A

bacillus [rod-like]
coccus [spherical]
vibrio [comma shaped]
spirillum [spiral]

20
Q

small circular dna is known as __________

A

plasmid

21
Q

define mesosome

A

specialised differentiated form of cell membrane

22
Q

the cell envelope consist of __________, __________ and ________________

A

glycocalyx
cell wall
plasma membrane

23
Q

bacteria are classified as ___________ and __________ on the basis of differences in cell envelope

A

i) gram positive
ii) gram negative

24
Q

the part of cell envelope which differs in composition and thickness.

mention the classifications of thickness

A

glycocalyx

i) loose shealth- slime layer
ii) thick and tough- capsule

25
Q

the part of cell envelope which determines the shape of the cell and provides strong structural support to prevent the bacteria from collapsing

A

cell wall

26
Q

the part of cell envelope which is selectively permeable and interacts with outside world

A

plasma membrane

27
Q

name the extensions of plasma membrane

A

vesicles
tubules
lamellae

28
Q

an extension of plasma membrane that helps in cell wall formation

A

vesicles

29
Q

an extension of plasma membrane that helps in DNA replication

A

tubules

30
Q

an extension of plasma membrane that helps in distribution of daughter cells

A

lamellae

31
Q

membranous extensions present in cynobacteria which contain pigments

A

chromatophores

32
Q

bacterial cells when motile have filamentous extensions from cell wall known as __________

A

flagella

33
Q

flagella is further classified into:

A

i) filament
ii) hook
iii) basal body

34
Q

bacterial cells when non-motile are classifies into ___________ and ____________-

A

pilli and fibriae

35
Q

elongated tubular structures made of a special protein

A

pilli

36
Q

small bristle like fibres sprouting out of the cell

A

fibriae

37
Q

ribosomes are present in _____________ of the cell

A

plasma membrane

38
Q

average size of ribosome is ________________

A

15nm-20nm

39
Q

ribosome is made of ______ and _________ subunit

A

50s and 30s
=70s

40
Q

ribosomes are site of _____________

A

protein synthesis

41
Q

when several ribosomes attach to single mRNA and form a chain, it is known as ____________

A

polyribosome/polysome

42
Q

reserve material are stored in cytoplasm in form of ______________

A

inclusion bodies

43
Q

protistis, plants, animals and fungi are type of ____________ cells

A

eukaryotic

44
Q

plant cells in eukaryotes have __________, ____________ and ________________ which are absent in animal cells.

A

cell wall
plasid
large central vacuole

45
Q

animal cells in eukaryotes have ______________ which is absent in plant cells

A

centrioles

Botany (1 decks)

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