Chapter 10 : Cell Cycle and Function

Question 1

What are the causes of cell division ?

Answer 1

disturbance of kern plasmic ratio

increase in the surface and volume ratio

Question 2

How long does it take a human cell to complete the cell cycle?

Answer 2

24 hrs

Question 3

How long does it take for a yeast cell to complete the cell cycle?

Answer 3

90 mins

Question 4

How long does it take for an E. Coli cell to complete the cell cycle?

Answer 4

20 mins

Question 5

What are the things that happens in the G 1 phase?

Answer 5

cell organelle are synthesized

maximum growth in the cell takes place

different types of RNA and proteins are synthesized

Question 6

What are hte things that happens inthe S phase?

Answer 6

replication of DNA

histone protein is synthesized

in animal cells: the centriole duplicates

Question 7

What happens in hte S phase?

Answer 7

speical material for the m phase is synthesized

Question 8

What is hte other name of G 0 phase?

Answer 8

quiescent phase

Question 9

In which animal haploid cell do we see mitosis? ( the exception)

Answer 9

some social animals( bees)

Question 10

Which cells show mitosis in plant cell?

Answer 10

both haploid and diploid cells of plant cell

Question 11

What marks the start of prophase?

Answer 11

condensation of chromosomal material

Question 12

What are the things that happens in the prophase stagr?

Answer 12

condensation of chromosome

formation of astral rays around the centriole

centrioles move to the opposite ends

at the end of prophase the centriole to the opposite ends

disassocaition of golgi apparatus, ER, Nucleolus, Nuclear envelope

Question 13

What marks the start of metaphase?

Answer 13

complete disintegration of hte nuclear envelope

Question 14

What is studied during the metaphsae?

Answer 14

morphology of chromosomes

Question 15

What happens during the G 2 phase?

Answer 15

the proteins for the formation of spindle fibre

Question 16

What happens in the metaphase?

Answer 16

spindle fibre is attached to the spindle fibre

the chromosome forms the metaphase plate

Question 17

What happens during the anaphse?

Answer 17

the chromosoes move towards the opposite ends

number of chromosomes doubles

chromatids move to the opposite ends

Question 18

What happens in the telophase stage ?

Answer 18

chromosomes move towards the opposite ends

nuclear envelope develops

nucleolus , golgi body and ER reforms

Question 19

What leads to the separation of the chromatids?

Answer 19

separatase enzyme

Question 20

How does cytokinesis take place in animal cells?

Answer 20

furrow formation

Question 21

What are the components involved to make the cell furrow?

Answer 21

actin is involved

Question 22

How does cytokinesis take place in plant cell?

Answer 22

with the fomraion of cell plate

Question 23

What happens ot the cell plate as the cells develops?

Answer 23

they form the middle lamellae

Question 24

What is the meaning of synctium?

Answer 24

when cytokinesis deos not take place after karyokinesis

Question 25

Give an example where synctium take place?

Answer 25

in the endosperm of coconut

Question 26

In what type of animal cells does mitosis take place?

Answer 26

in diploid cell except some social insects like bees

Question 27

In what type of plant cell does mitosis take place?

Answer 27

higher plant – diploid

lower plant— haploid

Question 28

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Answer 28

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