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CHAPTER 5

CELL CYCLE

Encircle the most appropriate answer from the following options

1.         The series of events from the time a cell is produced until it completes mitosis and produces new cells:           

(a) Cell cycle 

(b) Interphase

(c) Karyokinesis         

(d) Cytokinesis


2.         During interphase

(a) Cell’s metabolic activity takes place

(b) Duplication of chromosomes takes place

(c) Cell is divided in to two daughter cells

(d) Both a and b


3.         The major phases of cell cycle are:

(a) 5

(b) 4

(c) 3

(d) 2


4.         Interphase is divided into how many phases?           

(a) Four          

(b) Three

(c) Two           

(d) One


5.         Which of the following is the longest phase in cell cycle?     

(a) Mitotic phase        

(b) Inter phase

(c) GO phase 

(d) Gl phase


6.         During Gl phase:

(a) Cell increases its supply of proteins

(b) Increases its number of organelles

(c) Synthesis of enzymes and duplication of chromosomes

(d) All of these


7.         In which stage of cell cycle, the cell is preparing enzymes for chromosomes duplication?

(a) S-phase    

(b) G-l phase

(c) G-2 phase 

(d) M-phase


8.         In which phase cell duplicates its chromosomes?    

(a) Gl phase   

(b) S phase

(c) G2 phase  

(d) GO phase


9.         The phase of inter phase in which cell prepares proteins for mitosis:

(a) Gl phase   

(b) S phase

(c) G2 phase 

(d) GO phase


10.       At which stage of cell cycle cell stop dividing?         

(a) G 0

(b) G 1

(c) G 2

(d) S


11.       The cells that do not enter GO phase and continue to divide through out an organism’s

(a) Neurons    

(b) Epithelial cells

(c) Liver cells 

(d) kidney cells


12.       Mitosis was discovred in:       

(a) 1860          

(b) 1870

(c) 1880          

(d) 1890


13.       Who discovered mitosis?

(a) Walther Flemming          

(b) Oscar Hertwig

(c) T. H. Morgan        

(d) August Weismann


14.       Prokaryotic cells undergo a process similar to mitosis called:

(a) Binary fission

(b) Multiple fission

(c) Regeneration        

(d) Meiosis


15.       The division of cytoplasm:     

(a) Karyokinesis         

(b) Cytokinesis

(c) Prophase  

(d) Metaphase


16.       The division of nucleus is called:

(a) Karyokinesis       

(b) Cytokinesis

(c) Prophase  

(d) Metaphase


17.       Mitosis consist of phases:      

(a) One           

(b) Two

(c) Three        

(d) Four


18.       During mitosis one cell divides into daughter cells:   

(a) 2

(b) 3

(c) 4

(d) 5


19.       Which of the following is the longest phase of karyokinesis?

(a) Prophase 

(b) Metaphase

(c) Anaphase 

(d) Telophase


20.       Complete set of spindle fibres is known as:  

(a) Chromatin 

(b) Kinetochore

(c) Mitotic spindle    

(d) Cleavage


21.       Spindle fibers are formed during:

(a) Prophase 

(b) Metaphase

(c) Anaphase                                      

(d) Telophase


22.       The chromosomes arrange themselves along the equator of the cell in phase:

(a) Prophase  

(b) Metaphase

(c) Anaphase 

(d) Telophase 


23.       Which phase is a reversal of prophase?       

(a) Interphase 

(b) Metaphase

(c) Anaphase 

(d) Telophase


24.       In animal cells, cytokinesis occurs by a process called:

(a) Regeneration        

(b) Cleavage

(c) Binary fission        

(d) Both (a)and(b)


25.       New red blood cells are formed by:

(a) Mitosis     

(b) Meiosis

(c) Multiple fission      

(d) Both


26.       Which animal shows regeneration?

(a) Amoeba    

(b) Paramecium

(c) Sea star   

(d) Hydra


27.       Budding takes place in:          

(a) Amoeba    

(b) Paramecium

(c) Sea star    

(d) Hydra


28.       Asexual reproduction in hydra is takes place by:      

(a) Mitosis      

(b) Budding

(c) Cutting      

(d) Spore


29.       Tumors are produced as a result of errors in:                      

(a) Meiosis     

(b) Mitosis

(c) Binary fission        

(d) Multiple fission


30.       Errors in the control of mitosis may cause:   

(a) Cancer     

(b) Ulcer

(c) Constipation          

(d) Cough


31.       The tumors which remain at their production site are called:

(a) Benign     

(b) Malignant

(c) Metastasis

(d) All of these


32.       The phenomenon of spreading cancer:

(a) Infection    

(b) Regeneration

(c) Metastasis           

(d) All of these


33.       The word meiosis comes from:

(a) Latin word 

(b) Italian word

(c) Greek word         

(d) French word


34.       Who discovered meiosis?

(a) Walter Flemming

(b) Oscar Hertwig

(c) August Weismann

(d) T. H. Morgan


35.       Meiosis takes place in:

(a) Eukaryotic cells  

(b) Prokaryotic cells

(c) Haploid cells         

(d) All of these


36.       Those cell which give rise to gametes are called:     

(a) Somatic cells        

(b) Spindle Fibers

(c) Germs line cells  

(d) All of these


37.       Meiosis was discovered in:    

(a) 1875          

(b) 1876

(c) 1877          

(d) 1878


38.       In meiosis, one diploid cell divides into how many haploid cells?

(a) 2

(b) 4

(c) 6

(d) 8


39.       The longest phase in meiosis is:

(a) Prophase I           

(b) Metaphase I

(c) Anaphase I

(d) Telophase I


40.       In which phase chromosomes form a meta phase plate?

(a) Prophase  

(b) Metaphase

(c) Anaphase 

(d) Telophase


41.       In which phase of meiosisl the pairs of homologous chromosomes align along equatorial plane forming the metaphase plate?

(a) Prophase I

(b) Metaphase I

(c) Anaphase I

(d) Telophase 1


42.       The process in which homologous chromosomes line up with each other and form pairs:

(a) Tetrad       

(b) Crossing over

(c) Chiasmata

(d) Synapsis


43.       Who discovered crossing over?

(a) Walter Flemming  

(b) Oscar Hertwig

(c) August Weismann

(d) T. H. Morgan


44.       The phase in which crossing over occurs:    

(a) Anaphase 

(b) Metaphase

(c) Prophase 11         

(d) Prophase I


45.       The two non-sister chromatids of homologous chromosomes join each other at:

(a) Centromere          

(b) Kinetochore over

(c) Chiasmata           

(d) All of these


46.       Thomas Hunt Morgan observed crossing over in Drosophila melanogaster in:

(a) 1905          

(b) 1907

(c) 1909          

(d) 1911


47.       August Weismann described the significance of meiosis in:

(a) 1890          

(b) 1891

(c) 1892          

(d) 1893


48.       Many haploid fungi and protozoans produce haploid gametes through:

(a) Mitosis     

(b) Meiosis

(c) Regeneration        

(d) Budding


49.       The diploid sporophyte generation produces haploid spores through:

(a) Mitosis      

(b) Meiosis

(c) Budding    

(d) Fragmentation


50.       Gametophyte generation produces haploid gametes through:

(a) Mitosis     

(b) Meiosis

(c) Budding    

(d) Fragmentation


51.       The abnormal separation of homologous chromosomes during anaphase of meiosis:

(a) Disjunction

(b) Non-disjunction

(c) Synapsis   

(d) Crossing over


52.       The abnormal number of chromosomes in humans:

(a) 45 or 43    

(b) 47 or 45

(c) 46  

(d) All of these


53.       The programmed cell death: 

(a) Necrosis   

(b) Apoptosis

(c) Endocytosis          

(d) Exocytosis


54.       In an adult human, the number of cells that die each day by apoptosis:

(a) 30 – 50 billions       

(b) 40 – 60 billions

(c) 50 – 70 billions     

(d) 60 – 80 billions


55.       Blebs break off from the cell and are called:

(a) Apoptotic bodies

(b) Lysosomes

(c) Both a & b 

(d) None of these


56.       The accidental cell death:      

(a) Phagocytosis        

(b) Apoptosis

(c) Both a & b 

(d) Necrosis