L7 - Cell Cycle Flashcards

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1
Q

what is the cell cycle?

A

The series of events that take place when a cell divides

It consists of periods of cell growth and then division (mitosis or meiosis)

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2
Q

What are the 3 main stages?

A

Interphase - Cell prepares to divide

Nuclear division - Nucleus of cell divides

Cell division - Separation of cytoplasm to form daughter cells
(also called cytokinesis)

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3
Q

What are the detailed phases?

6

A

G1 (first growth stage)

S (synthesis stage)

G2 (2nd growth stage)

M (mitosis)

Cytokinesis

G0

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4
Q

what happens in the G1 phase?

A

rapid cell growth

proteins are synthesised for

manufacture of new organelles

lasts 10 hours

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5
Q

what happens in the S phase?

A

DNA is replicated

lasts 9 hours

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6
Q

what happens in the G2 phase?

A

organelles are duplicated, centrioles duplicate

Lasts 4 hours

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7
Q

what happens in the M phase?

A

mitosis

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8
Q

what happens in the cytokinesis phase?

A

Separation of cytoplasm to form daughter cells

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9
Q

what happens in the G0 phase?

A

cells may differentiate, die or enter senescence (where they stop dividing)

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10
Q

why does cell mass increase initially and then decrease?

A

increase - there is rapid cell growth

decrease - cytokinesis

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11
Q

why does DNA mass increase just after the start,

then decrease just before 24 hours

and then stay constant for several hours before increasing again?

A

increase - DNA being replicated

decrease - mitosis takes place

constant - synthesising

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