Q11Written answer
At what stage of cell cycle does DNA synthesis take place?
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Ans: DNA synthesis takes place during the S phase of the cell cycle.
NCERT Exemplar · Class 11 · Biology
Chapter 10: Cell Cycle and Cell Division
Practice each question, then open the answer or worked solution.
Very Short Answer Questions
14 questionsQ12Written answer
It is said that the one cycle of cell division in human cells (eukaryotic cells) takes 24 hours. Which phase of the cycle do you think occupies the maximum part of the cell cycle?
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Ans: Interphase occupies the maximum part of the cell cycle.Its time period is generally 18-20 hours.
Q13Written answer
It is observed that heart cells do not exhibit cell division. Such cells do not divide further and exit_____ phase to enter an inactive stage called _____ of cell cycle. Fill in the blanks.
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Ans: \[{G_1}\] phase, quiescent phase \[{G_0}\] .
Q14Written answer
In which phase of meiosis are the following formed? Choose the answers from hint points given below.
(a) Synaptonemal complex _____
(b) Recombination nodules _____
(c) Appearance/activation of _____ enzyme recombinase
(d) Termination of chiasmata ____
(e) Interkinesis ____
(f) Formation of dyad of cells _____
Hint-: |
1) Zygotene |
2) Pachytene |
3) Pachytene |
4) Diakinesis |
5) After Telophase-I /before Meiosis-II |
6. Telophase-I /After Meiosis-I |
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Ans:
a. Zygotene
b. Pachytene
c. Telophase - I/After Meiosis – I
d. Diakinesis
e. After Telophase - I/before Meiosis – II
f. Pachytene