cell cycle

Question 1

what is the cell cycle and what are the different stages

Answer 1

-process tat al body cells in a multicellular organism use to grow and divide

interphase;
-G1
-S
-G2

-MITOSIS
-CYTOKINESIS

Question 2

what is the G1 phase

Answer 2

growth phase where cellular components excluding chromosomes are duplicated - this requires proteins so lots of transcription and translation occurs

Question 3

what is the G0 phase and when does it happen

Answer 3

-when the cell cycle stops and cell exits the cycle

happens if
-cell is fully differentiated
-damaged DNA (senescent cell)
-in G0 temporarily e.g B memory cells

Question 4

what is the S phase

Answer 4

-DNA replicate and 46 chromosomes and dubplicated

Question 5

what is the G 2 phase

Answer 5

-cell checks the duplicated chromosomes for error and makes repairs if needed
transcription/translation
energy stores replaced

Question 6

what is the G1 checkpoint for

Answer 6

-cell checks for damage in DNA and that chemicals needed for replication/ size of cell is correct

Question 7

what is the G2 checkpoint for

Answer 7

-cell checks whether DNA has been replicated without damage

Question 8

what is the m (metaphase) check point for and what could happen if the check point fails

Answer 8

cell checks that chromosomes are assembled correctly on the mitotic spindle

-if it fails, cell my end up with more chromosomes than its diploid number as chromatids may not have separated correctly if not aligned correctly on the spindle