Answer:
The false statement(s) is option(3).
That is,
Only one cycling is required per cell cycle 'is false'
Explanation:
Cyclins combine with Cyclin-Dependent protein kinase(CDKs) to form a complex cyclin-CDKs.
This complex comprise so many cyclin, per cycle. This shows that it is a false statement that only one cyclin is required per cell cycle.
The name "Cyclins" came up because they undergo a constant cycle of synthesis and degradation during cell division. When cyclins are synthesized, they act as an activating protein and bind to Cdks forming a cyclin-Cdk complex.
This complex then acts as a signal to the cell to pass to the next cell cycle phase.
After a particular phase, the cyclin degrades, deactivating the Cdk, thus signaling exit from a the phase.