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Cell Cycle And Cell Division

Question
CBSEENBI11003260
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At what stage of the cell cycle are histone proteins synthesized in a eukaryotic cell?

  • During entire prophase

  • During telophase

  • During S-phase

  • During G2 stage of prophase

Solution

C.

During S-phase

Histone proteins are basic proteins used for the packaging of eukaryotic DNA. Both DNA and histones together comprise of chromatin, forming bulk of eukaryotic chromosomes. There are 5 major kinds of histones- H1, H2A, H2B, H3 and H4. 

H1 histone is used for linking neighbouring chromosomes while others are used as elements of nucleosomes structure. During S- phase of cell cycle, synthesis of histone proteins takes place as the chromosome number gets doubled to that of somatic number.

Some More Questions From Cell Cycle and Cell Division Chapter

Name the process in which there is an exchange of genetic material between non-sister chromatids of homologous chromsomes during meiosis.

What is polyteny ?

 Namethe five phases of of Prophase I.

 What are two types of cells on the basis of presence or absence of nucleus ?

Name an important event that occurs during meiosis and not during mitosis.

Name a cell that has half the number of chromosomes. Name the process responsible for the reduced number.

Name the sub-stage of meiosis in which crossing over takes place.

At which stage of mitosis, the two chromatids of each chromosome separate and move towards opposite poles.

Name the cell division which is responsible for growth and healing of wounds.

What type of cell division can produce variations ?

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