Cell: unit of life

Question 1

Who studied/discovered dead cells?

Answer 1

Robert Hooke

Question 2

who discovered living cells

Answer 2

Anton Von Leeuwenhoek

Question 3

who discovered the nucleus of the cell?

Answer 3

Robert Brown

Question 4

Cell theory was given by

Answer 4

schleiden & schwann

Question 5

who modified the cell theory

Answer 5

Rudolf Virchow

Question 6

_______ is the main arena of cellular activities

Answer 6

cytoplasm

Question 7

non-membrane bound organelle present in animal cells

Answer 7

centrosome

Question 8

centrosome helps in ___________

Answer 8

cell division

Question 9

name the smallest cell

Answer 9

mycoplasma

Question 10

name the largest cell

Answer 10

ostrich egg

Question 11

name the longest cell

Answer 11

nerve cell

Question 12

what is the size of bacteria

Answer 12

3-5 μm

Question 13

what is the size of human RBC

Answer 13

7 μm

Question 14

what is the size of typical bacteria

Answer 14

1-2 μm

Question 15

what is the size of PPLO

Answer 15

0.1 μm

Question 16

PPLO is a type of ____________________

Answer 16

Mycoplasma

Question 17

what is the size of virus

Answer 17

0.02-0.2

Question 18

give few examples of prokaryotic cells

Answer 18

bacteria
blue-green algae
mycoplasma
PPLO

Question 19

name four basic shapes of bacteria

Answer 19

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

Question 20

small circular dna is known as __________

Answer 20

plasmid

Question 21

define mesosome

Answer 21

specialised differentiated form of cell membrane

Question 22

the cell envelope consist of __________, __________ and ________________

Answer 22

glycocalyx
cell wall
plasma membrane

Question 23

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

Answer 23

i) gram positive
ii) gram negative

Question 24

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

mention the classifications of thickness

Answer 24

glycocalyx

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

Question 25

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

Answer 25

cell wall

Question 26

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

Answer 26

plasma membrane

Question 27

name the extensions of plasma membrane

Answer 27

vesicles tubules lamellae

Question 28

an extension of plasma membrane that helps in cell wall formation

Answer 28

vesicles

Question 29

an extension of plasma membrane that helps in DNA replication

Answer 29

tubules

Question 30

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

Answer 30

lamellae

Question 31

membranous extensions present in cynobacteria which contain pigments

Answer 31

chromatophores

Question 32

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

Answer 32

flagella

Question 33

flagella is further classified into:

Answer 33

i) filament ii) hook iii) basal body

Question 34

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

Answer 34

pilli and fibriae

Question 35

elongated tubular structures made of a special protein

Answer 35

pilli

Question 36

small bristle like fibres sprouting out of the cell

Answer 36

fibriae

Question 37

ribosomes are present in _____________ of the cell

Answer 37

plasma membrane

Question 38

average size of ribosome is ________________

Answer 38

15nm-20nm

Question 39

ribosome is made of ______ and _________ subunit

Answer 39

50s and 30s =70s

Question 40

ribosomes are site of _____________

Answer 40

protein synthesis

Question 41

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

Answer 41

polyribosome/polysome

Question 42

reserve material are stored in cytoplasm in form of ______________

Answer 42

inclusion bodies

Question 43

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

Answer 43

eukaryotic

Question 44

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

Answer 44

cell wall plasid large central vacuole

Question 45

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

Answer 45

centrioles