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botany
cell division and cell cycle
| Question | Answer |
|---|---|
| why does DNA replication, cell division , cell growth all have to take place in a coordinated manner? | to ensure correct cell division and formation of progeny calls containing intact chromosomes |
| what is a cell cycle? | the sequence of the events by which the cell duplicates its genome , synthesizes other constituents of the cell and eventually divides into 2 daughter cells |
| is cell growth in terms of cytoplasmic increase continuous? | yes |
| the replicated chromosomes are distributed to the daughter nuclei by a complex series of events , the event are under whose control? | they are under genetic control |
| how much time does a cell approx take to divide | 24 hours |
| Cell cycle is divided into how many number of phases And which are they ? | Interphase and m phase also known as mitotic phase |
| What does the M phase signify or represent ? | it represents the actual cell division or mitosis occurring |
| What is the interphase signify? | it signifies the phase between two successive m phases |
| How much time does M phase and interphase takes in the division ? | M phase takes 1 hour and interphase takes around 22.8 or 23 hours |
| M phase starts with a — and ends with a —? | Nuclear division , cytoplasmic division |
| is interphase actually a resting phase ? what does it do? | no , it is the time where the cell is preparing for division by undergoing both cell growth and dna replication |
| 3 phases of interphase | g1 s and g2 |
| What is g1 phase ? is the cell metabolically active in this stage?does it grow? | it corresponds to the phase between mitosis and dna replication ,cell is metabolically active , it does grow |
| what is s phase?is the dna double during this time?is there a increase in chromosome number ? | marks the phase when dna replication takes place , during this time the dna is double,there s no inc in chromosome number |
| in animals during s phase what happens in nucleus and cytoplasm? | dna replication happens in nucleus and in cytoplasm centriole replicates |
| what happens during g2 phase? | proteins are synthesised for mitosis while cell growth continues |
| the cells that do not divide further exit -- phase and enter the --- phase which is inactive | g1,quiescent stage |
| are the cells metabolically active in quiescent stage? | yes |
| do they proliferate unless told to do so | no |
| in animals mitosis only occurs in ---------- cells all though there are few exceptions eg----- and plants show mitosis in both --- and --- cells | diploid somatic , male honey bees, haploid and diploid cells |
Created by:
riyaaa
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