Quiz 28.11.23

A lone Cyclin dependant kinase is .....

• active

• inactive

What are Cdks?

• cyclins, proteins that phosphorylate specific target enzymes

• proteins, help phosphorylate specific target enzymes

• kinases, enzymes that phosphorylate specific target proteins

• metabolites, proteins that help phosphorylate specific target proteins

What activates a Cdk ?

• the binding of cyclin, making it a functional enzyme

• the binding of RNA ,making it a functional enzyme

• the binding of helicase, making it a functional enzyme

• the binding of botulism, making it a functional enzyme

What are the three sub-phases of interphase ?

• G1 ( first gap) G2 ( second gap) G3 ( third gap)

• G1 phase ( first gap), S phase ( synthesis)

  G2 phase ( second gap)

• G1 phase ( synthesis) G2 phase ( First gap ) G3 ( second gap )

• G1 phase (initialisation) SYnthesis ( obstruction) G2 ( prophase)

which of these phrases is true ?

• When a cyclin attaches it also directs the protein to a specific set of target enzymes, ones appropriate to the cell cycle period controlled by the polymerase.

• When a cyclin attaches it also directs the Cdk to a specific set of target proteins, ones appropriate to the cell cycle period controlled by the cyclin.

• When a protein attaches it also directs the Cdk to a specific set of target enzymes , ones appropriate to the cell cycle period controlled by the helicase.

• When a cyclin attaches it also directs the Cdk to a specific set of target enzymes, ones appropriate to the cell cycle period controlled by the proteins .

Which of these is an example of how Cyclins and Cdks work together ?

• MPF ( major promoting factor)

• PFM (premature maturation factor)

• MPF ( maturation promoting factor)

• MPF ( maturation prevention factor)

What do the MPF complexes do ?

• mix up phosphate tags at several different proteins in the ribosome, resulting in its randomisation and also activates targets that promote chromosome condensation and other replication events

• takes away phosphate tags to several different enzymes in the mitochondria , resulting in its breakdown, and also activates targets that promote chromosome condensation and other M phase events.

• add phosphate tags to several different proteins in the nuclear envelope, resulting in its breakdown, and also activates targets that promote chromosome condensation and other M phase events.

• dissolves phosphate tags in the cell wall, resulting in its breakdown and also deactivates targets that promote chromosome condensation and other M phase events.

What is anchorage dependace

• animal cells like to go sailing while they divide

• most animal cells have to be in contact with a solid surface to divide

• the idea that ships need to drop an anchor to stay still

• most animal cells need to attach to each other to divide

How far can a one month baby see ?

• no one knows

• exactly 50 cm

• About one metre away

• 25 metres

what did Hebb 1949 say about cells?

• cells that wire together fire together

• cells that fire together wire together

• cells that work together divide together

• cells that are next to each other don't work together