Cell cycle and cell division

Question 1

what is the duration of a cell cycle of yeast ?

Answer 1

90 min

Question 2

what is the duration of a cell cycle of a fibroblast cell ?

Answer 2

24 hrs

Question 3

cell cycle is under genetic control of which enzymes ?

Answer 3

1. cyclin
2. CDK - cyclin dependent protein kinase / cell division kinase

Question 4

in which stage the DNA replication takes place ?

Answer 4

S phase

Question 5

what is the duration of cell cycle of Ecoli ?

Answer 5

20 min

Question 6

what are the two phases of the cell cycle ?

Answer 6

1. interphase
2. m phase

Question 7

interphase is also known as ?

Answer 7

prepratory/non dividing/resting phase

Question 8

x% of time is required for interphase ?

Answer 8

95% = 23hrs

Question 9

x% of time is required for m phase ?

Answer 9

5% = 1hr

Question 10

interphase is divided into which three stages ?

Answer 10

1. G1 phase
2. S phase
3. G2 phase

Question 11

m phase is divided in which two stages ?

Answer 11

1. karyokinesis
2. cytokinesis

Question 12

duration of G1 phase

Answer 12

11hrs

Question 13

duration of s phase

Answer 13

8hrs

Question 14

duration of G2 phase

Answer 14

4 hrs

Question 15

karyokinesis of m phase is divided into which 4 stages ?

Answer 15

1. prophase
2. metaphase
3. anaphase
4. telophase

Question 16

time interval between previous mitosis and initiation of DNA replication is called ?

Answer 16

G1 phase

Question 17

in G1 phase cell is in which metabolic state ?

Answer 17

highly metabolically actives state.

Question 18

synthesis of what takes place in G1 phase ?

Answer 18

RNA, Protein, ATP synthesis takes place

Question 19

maximum growth in which cell organelles takes place in G1 phase ?

Answer 19

nucleus and cytoplasm

Question 20

which cell organelles do not replicate in G1 phase ?

Answer 20

mitochondria and chloraplast

Question 21

a point at the end of the G1 phase when crossed the cell is not able to enter into G1 phase again is called________ in mammals and _________ in yeast ?

Answer 21

restriction point in mammals
start point in yeast

Question 22

DNA synthesis takes place in which phase ?

Answer 22

S phase

Question 23

in animal cell which cell organelle duplicates in S phase ?

Answer 23

centriole

Question 24

which protein gets synthesized in the S phase ?

Answer 24

Histone protein

Question 25

amount of content of DNA gets _______ in S phase

Answer 25

double

Question 26

amount of chromosome _________ in s phase

Answer 26

remains same

Question 27

shortest phase of interphase is

Answer 27

G2 phase

Question 28

G2 phase is also called

Answer 28

cytoplasmic growth phase

Question 29

what get synthesized in G2 phase ?

Answer 29

RNA, protein, ATP synthesis

Question 30

duplication of which cell organelle takes place in G2 phase ?

Answer 30

mitochondria and chloroplast

Question 31

which monomer protein forms in G2 phase ?

Answer 31

α , β - tubulin monomer protein

Question 32

G0 phase is also known as

Answer 32

quiescent stage

Question 33

G0 stage metabolically ________ but __________ for cell division

Answer 33

metabolically active but inactive for cell division

Question 34

which cells do not show division ?

Answer 34

heart cells and most of the nerve cells

Question 35

what is apoptosis ?

Answer 35

natural cell death program

Question 36

unavaibility of _________ leads to G0 stage

Answer 36

mitogens

Question 37

what is mitotic poison ?

Answer 37

they oppose mitosis

Question 38

mitogens in plants are

Answer 38

auxin and cytokinin

Question 39

actual cell division phase is

Answer 39

M phase

Question 40

in animal cells mitosis usually takes place in which type of cell ?

Answer 40

diploid somatic cells ( non reproductive cells )

Question 41

examples of haploid cells are

Answer 41

male drone species honey bees

Question 42

in which haploid cell does mitosis takes place ?

Answer 42

marchantina

Question 43

mitosis is also known as

Answer 43

equational division

Question 44

which is the most dramatic phase of cell cycle ?

Answer 44

M phase

Question 45

which is the first stage of karyokinesis of mitosis

Answer 45

prophase

Question 46

which is the longest phase of karyokinesis ?

Answer 46

prophase

Question 47

DNA molecules are not distinct but intertwined in which phase

Answer 47

G2 phase

Question 48

prophase is marked by

Answer 48

initiation of condensation of chromosomal material

Question 49

centriole begins to move towards the opposite poles in which phase ?

Answer 49

prophase

Question 50

prophase is divide in two phases

Answer 50

early prophase and late prophase

Question 51

chromosomes appear as long, thin, single stranded structure in which phase

Answer 51

early prophase

Question 52

in early prophase nucleolus is attached to chromosome at ______________

Answer 52

nuclear organiser region

Question 53

in early prophase chromatin undergo dehydration to form long, thin and coiled structure this process is called as

Answer 53

spiralization

Question 54

in early prophase chromosome ends are indistinct and appear ball of wool called as

Answer 54

sprime stage

Question 55

multi-protein complex innvolved condensation of chromosome in late prophase are

Answer 55

condensin cohesin

Question 56

kinetochore protein gets mature in ___________prophase

Answer 56

late prophase

Question 57

centriole reach to the opposite poles and start spindle formation in ___________prophase and start radiating out __________

Answer 57

late prophase microtubules

Question 58

nuclear envelope, nucleolus, golgi complex, endoplasmic reticulum ___________ in late prophase

Answer 58

disappear

Question 59

the two aster rays together with spindle fibers forms

Answer 59

mitotic apparatus

Question 60

prometaphase is charctersised by ______________

Answer 60

complete disintegration of nuclear envelope and nucleolus

Question 61

aster formation is completed and mitotic spindle is attached to kinetochore in which transition phase ?

Answer 61

transition to metaphase / prometaphase

Question 62

the start of metaphase is marked by

Answer 62

complete disintegration of the nuclear envelope

Question 63

best stage to study the morphology of the chromosome is

Answer 63

metaphase

Question 64

kinetochore acts as a __________ for the spindle fibers

Answer 64

attachment site

Question 65

what is metakinesis ?

Answer 65

the tightening of chromosomal fibers brings all the chromosomes at he equator of the cell in metaphase it is also known as compression

Question 66

metaphase is characterised by

Answer 66

allignement of all the chromosomes at the equator of the cell