When radioactive thymine is added to the medium during the synthesis of new $DNA$ in human cells,which of the following chromatids will become radioactive in cells that enter the phase immediately upon contact with radioactive thymine?
- AHeterochromatin
- BEuchromatin
- CBoth heterochromatin and euchromatin
- DNeither heterochromatin nor euchromatin,but only the nucleus
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Similar Questions
In which type of cell division are chromosomes not clearly visible?
Easy
View SolutionMatch the Column-$I$ with Column-$II$:
Column-$I$ Column-$II$ $(I)$ $M$ phase $(i)$ Nucleolus,golgi complex and $\text{ER}$ reform $(II)$ Telophase $(ii)$ No replication of $\text{DNA}$ $(III)$ Diakinesis $(iii)$ Most dramatic period of the cell cycle $(IV)$ Interkinesis $(iv)$ Terminalisation of chiasmata
| Column-$I$ | Column-$II$ |
|---|---|
| $(I)$ $M$ phase | $(i)$ Nucleolus,golgi complex and $\text{ER}$ reform |
| $(II)$ Telophase | $(ii)$ No replication of $\text{DNA}$ |
| $(III)$ Diakinesis | $(iii)$ Most dramatic period of the cell cycle |
| $(IV)$ Interkinesis | $(iv)$ Terminalisation of chiasmata |
Medium
View SolutionWhich is the direct or primitive type of cell division?
Easy
View SolutionSelect the correct option for the following matches:
List-$I$ List-$II$ $(1)$ Metaphase-$I$ $(a)$ Number of chromosomes becomes half of the parent cell $(2)$ Anaphase-$I$ $(b)$ Each chromosome splits at the centromere to form chromatids $(3)$ Anaphase-$II$ $(c)$ Homologous chromosomes form pairs at the equatorial plate $(4)$ Telophase-$II$ $(d)$ Homologous chromosomes move towards opposite poles
| List-$I$ | List-$II$ |
| $(1)$ Metaphase-$I$ | $(a)$ Number of chromosomes becomes half of the parent cell |
| $(2)$ Anaphase-$I$ | $(b)$ Each chromosome splits at the centromere to form chromatids |
| $(3)$ Anaphase-$II$ | $(c)$ Homologous chromosomes form pairs at the equatorial plate |
| $(4)$ Telophase-$II$ | $(d)$ Homologous chromosomes move towards opposite poles |
Medium
View SolutionMatch the following events that occur in their respective phases of cell cycle and select the correct option:
Column $I$ Column $II$ $(a)$ $G_{1}$ phase $(i)$ Cell grows and organelle duplication $(b)$ $S$ phase $(ii)$ $DNA$ replication and chromosome duplication $(c)$ $G_{2}$ phase $(iii)$ Cytoplasmic growth $(d)$ Metaphase in $M$-phase $(iv)$ Alignment of chromosomes
| Column $I$ | Column $II$ |
| $(a)$ $G_{1}$ phase | $(i)$ Cell grows and organelle duplication |
| $(b)$ $S$ phase | $(ii)$ $DNA$ replication and chromosome duplication |
| $(c)$ $G_{2}$ phase | $(iii)$ Cytoplasmic growth |
| $(d)$ Metaphase in $M$-phase | $(iv)$ Alignment of chromosomes |
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