Exchange of genetic material between two homologous chromosomes occurs in

(1) Leptotene                

(2) Diakinesis

(3) Pachytene               

(4) Diplotene

Subtopic:  Cell Cycle: Meiosis I |
 91%
From NCERT
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How many meiotic divisions are required to produce 50 wheat grains?

(1) 100                         

(2) 200

(3) 25                           

(4) 63

 

Subtopic:  Cell Cycle: Meiosis I | Cell Cycle: Meiosis II |
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A typical eukaryotic cell cycle is illustrated by human cells in culture. These cells divide once in approximately every

(1) 24 hours                  

(2) 90 minutes

(3) 20 minutes               

(4) 9 hours

Subtopic:  Intro to Cell Cycle & Interphase |
 93%
From NCERT
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Choose incorrect statement with respect to cell cycle

(1) Duration of cell cycle can vary from organism to organism

(2) Duration of cell cycle is uniform in different cell types of an organism

(3) Events of cell cycle are under genetic control

(4) It is divided into two basic phases

Subtopic:  Intro to Cell Cycle & Interphase |
 86%
From NCERT
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Choose the correct sequence with respect to  different phases of cell cycle

(1) G1 S, G2, M             

(2) G1, G2, S, M

(3) M, G2, G1, S             

(4) S, M, G2, G1

Subtopic:  Intro to Cell Cycle & Interphase |
 97%
From NCERT
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Human nerve cells do not divide after birth and they remain throughout their life in which phase of cell cycle?

(1) M-phase                  

(2) G1 phase

(3) G0 phase                 

(4) Invisible phase

Subtopic:  Intro to Cell Cycle & Interphase |
 92%
From NCERT
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Various phases of cell cycle are controlled by

(1) Cyclin proteins

(2) Cyclin dependent protein kinases

(3) Phosphorylation of cyclin dependent protein kinases

(4) More than one option is correct

Subtopic:  Intro to Cell Cycle & Interphase |
 68%
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Amount of DNA and Number of chromosomes in G2 phase of cell cycle would be

(1) Double and equal to that of in G1 phase respectively

(2) Half and equal to that of in G1 phase respectively

(3) Equal and half to that of in Gphase respectively

(4) Double and double to that of in G1 phase respectively

Subtopic:  Intro to Cell Cycle & Interphase |
 87%
From NCERT
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Exchange of genetic material between non-sister chromatids of homologous chromosomes in pachytene stage is facilitated by

(1) Dynein                    

(2) Recombinase

(3) chiasmata                

(4) Calmodulin

 

Subtopic:  Cell Cycle: Meiosis I |
 91%
From NCERT
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Plant cells do not divided their cytoplasm by forming a furrow in cell membrane like animal cells rather they divide by cell plate because

(1) Plant cell do not have centrioles

(2) Cell wall formation beings with formation of cell plate

(3) Cell plate represents middle lamella between the walls of two adjacent cells

(4) Plant cells are enclosed by a relatively inextensible wall

Subtopic:  Cell Division: Mitosis (Cytokinesis) |
 53%
From NCERT
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