Unit 5 Cells Stability and Change

What are the most important mechanisms in cell cycle control?

• Cyclins

• Kinases

• Proteins

• Cyclin dependent kinases

Where are the main check/restriction points in the cell cycle?

• S/M

• G0

• G1/S

• G2/M

Where do the checkpoints receive information from?

• The Plasma Membrane

• Cell DNA

• Intra and extracellular processes

• The Nucleous

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If the cell does not recieve a 'GO' signal at G1/S where will it go?

• Straight to M

• To G0/resting phase

• To G2

• Stays where it is

If the cell does not recieve a 'GO' signal at G2/M phase what will happen?

• It will carry on cell division

• The final stages of cell divison will not take place

• It will return to G0/resting phase

• It will go back to S phase

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What are protein kinases?

• Enzymes that occur throughout the body

• Lipids that occur throughout the body

• Regulatory proteins occurring throughout the body

• Regulatory proteins occurring outside the body

When a protein kinase is able to bind with a cyclin they form a......

• Miotic spindle

• Anaphase promoting complex

• Miotic promoting factor

• Cyclin promoting factor

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What is a Kinetochore?

• A yummy ice cream

• A protein structure within the centromere where spindle fibres attach

• Part of the cytoskeleton

• Kinetic energy that does your chores

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During Mitosis and Meiosis kinetochores are responsible for....

• Starting, controlling and supervising chromosomes in cell division

• Starting, controlling and supervising the nucelus in cell division

• Starting, controlling and finishing chromosomes in cell division

• Stopping chromosomes moving in cell division

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During anaphase further cell divsion will not proceed until....

• The kinetochore releases miotic promoting factor

• The nuclear envelope disappears

• The kinetochore releases anaphase promtoing complex

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