Any ideas on how to modify this graph

I need the graphics of my code to end as similar to the image. I do not know if I just have to play with the values ​​or if I have to add something more.

ki = .1; ku = 1;
Km1=.001; Km2=.001;
dydx = @(x, y)[ y(2)*ki*y(1)/(Km1+y(2))-y(1)*ku*x(1)/(Km2+y(1));(y(2)*ki*y(1)/(Km1+y(2))+y(1)*ku*x(1)/(Km2+y(1)))];
[x,y]=ode45(dydx,[0,2],[.10000 0]);

figure(2)
plot(x,y); xlabel('tiempo (h)'); ylabel('Numero de moleculas'); title('Biomasa'), grid on