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(C) The synthesis $(S)$ phase of the cell cycle is characterized by the following events:$1$. $DNA$ replication: The amount of $DNA$ per cell doubles

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Four

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(C) The synthesis $(S)$ phase of the cell cycle is characterized by the following events:$1$. $DNA$ replication: The amount of $DNA$ per cell doubles (from $2C$ to $4C$).$2$. Chromatin fibre duplication: As $DNA$ replicates,the chromatin fibres also duplicate.$3$. Histone protein synthesis: Histones are synthesized in the cytoplasm and transported to the nucleus to package the newly replicated $DNA$.$4$. Centriole duplication: In animal cells,the centriole duplicates in the cytoplasm during the $S$ phase.Membranous organelle duplication (like mitochondria and Golgi bodies) typically occurs during the $G_1$ and $G_2$ phases,not the $S$ phase.Therefore,the features associated with the $S$ phase are: $DNA$ replication,chromatin fibre duplication,histone protein synthesis,and centriole duplication. This makes a total of four features.

Chromatin fibres duplication,Genetic material-$4C$,Histone protein synthesis,Membranous organelle duplication,$DNA$ replication,centriole duplication. How many of the above features are associated with the synthesis $(S)$ phase of the cell cycle?

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