Cell Cycle and Cell Division Flashcards
Ability to grow and _________ is the fundamental property of all living organisms.
Reproduce
Cell cycle consists of two phased namely :
Interphase
M or mitotic phase
Interphase is a phasr between the two successive M phase, where the cell ______ ________ ___ ____ ___________ .
Prepares itself for cell division
Where does the actual cell divsion take place?
M or mitotic phase
_______ of cell cycle varies from organism to organism and also frok cell to cell.
Period
A yeast cell divides once in __ mins
90
A human cell divides approximately every __ hours
24
What is the most active stage of cell cycle?
Interphase
Is cell cycle, which stage is also called the resting phase.
Interphase
Interphase is further divided into three parts namely :
G¹ phase
S phase
G² phase
G¹ is also called _____ _________ phase or _____ ________ phase
Pre-DNA synthesis
Post mitotic
S phase is also called as ____ _________ phase.
DNA synthesis
G² phase is also called as ____ ___ _________ phase or ___ ________ phase.
Post DNA synthesis
Pre-mitotic
Which phase is the interval between mitosis and initiation of DNA replication?
(1) G¹ phase
(2) S phase
(3) G² phase
G¹ phase
During cell cycle, RNA and proteins are synthesised in
(1) G¹ phase
(2) G² phase
(3) S phase
G¹ phase
If a cell divides frequently, then it has a ________ G¹ phase and if a cell does not divide frequently, then it ha a ________ G¹ phase.
Shorter
Longer
Which cell in animal does not divide?
Nerve cell
Cells of which stage remains metabolically active but there is no longer proliferation?
(1) G¹ phase
(2) S phase
(3) G² phase
(4) G⁰ phase
G⁰ phase
In which phase does replication of DNA occurs?
S phase
In S phase the amount of nucleic acid ie DNA doubles but the ___________ _________ remains the same.
Chromosome number
What holds the two sister chromatids together?
Centromere
In animal cell, during the S phase, DNA replication begins in the _________, and the centrioles duplicate in the __________. Centrioles are required during the M phase. The centrioles are absent in the plant cell.
Nucleas
Cytoplasm
G² phase occurs between
S and M phase
In G² phase _______ protein synthesis take place and Mitochondria, ___________ and _____ ________ duplicate in this phase.
Tubulin
Chloroplast
Golgi bodies
The DNA synthesis stops at this phase but cell synthesizes ____, ________ etc. required during the next phase.
RNA
Proteins
In animals, mitotic division is only seen in a _______ somatic cells, whereas in plant cells, mitotic divison occurs in both ________ and _______ cells.
Diploid
Haploid
Diploid
What is the most dramatic period of the cell cycle?
M-phase
Distribution of the already duplicated compounds occurs in an orderly manner. It consists of two processes-
Karyokinesis
Cytokinesis
Cytokinesis is the division of _________
Karyokinesis is the division of ________
Cytoplasm
Nucleus
Mitosis is called __________ division because the two daughter cells have the same number of chromosomes as that present in the parent cell.
Equational
Mitosis was first observed by ____________ in plant cell and by _______ ___________ in animal cell.
Starsburger
Walter Flemming
The term mitosis was given by _______ __________ in 1882
Walter Flemming
Mitosis is also called ________ cell division because it occurs in __________ cells (body cells) of the animals.
Somatic
The best phase to observe shape, size and number of chromosomes is
Prophase
Cells at the end of prophase, when viewed under the microscope do not show ______ _________, __, ________ ___________ and ________.
Golgi bodies
ER
Nuclear membrane
Nucleolus
In prophase the condensation of _________ material takes place.
Chromatin
In metaphase the disintegration of the ______ ________ marks the beginning of the metaphase.
Nuclear envelope
Chromosome during which stage are called the thickest and shortest?
Metaphase
Best stage to study their morphology
Metaphase
