'''
In this set of exercises, we will combine basic Boolean operators to define 
when certain biological events are allowed to take place.
'''

''' 
Exercise A: Cell cycle G1 checkpoint

Define 3 variables - DNA_damaged, E2F_present, and not_touching - and assign 
Boolean values to them. The statement can_pass_g1 should be true if there is 
enough space, no DNA damage, and no E2F proteins. You can try to assign 
different values to the three variables and see how these affect the outcome
(can_pass_g1).

Use this as a guideline:
DNA_damaged - true if damaged
E2F_present - true if present
not_touching - true if it is not overcrowded
'''

# Your code here

can_pass_g1 = # Your code here


''' 
Exercise B: Cell cycle G2-M checkpoint

Define 2 variables - DNA_damaged and cyclinB_present - and assign Boolean values
to them. The statement can_pass_g2m should read true if there is no DNA damage 
and if cyclinB is present. You can try to assign different values to the two 
variables and see how these affect the outcome (is the cell allowed to pass the 
cell cycle checkpoint).

Use this as a guideline:
DNA_damaged - true if damaged
cyclinB_present - true if present
'''

# Your code here

can_pass_g2m = # Your code here


''' 
Exercise C: Enzyme production

Define 2 Boolean variables - MetA_present and MetB_present - and assign value to
them. Based on these variables, define make_enzyme. The cell should start 
to produce the enzyme if metabolite A or metabolite B is present, but not both.
How does changing values of MetA_present or MetB_present affect the outcome?

Use this as a guideline:
MetA_present - true if present
MetB_present - true if present
'''

# Your code here

make_enzyme = # Your code here


'''
Exercise D: (Bonus) Cancer

Rewrite Exercise A so that the behaviour would imitate that of cancer.
'''

# Your code here