An antibody binds to an antigen with a Kd of 5 x 10-8 M. At what concentration of antigen will the fraction bound be (a) 0.2, (b) 0.5, (c) 0.6, (d) 0.8

1. 1.25x10^-8m

2. 5x10^-8m

3. 7.5x10^-8m

4. 2x10^-7m

Explanation:

This question requires us to find concentration of antigen at 0.2,0.5,0.6, and 0.8

At 0.2

= 0.2x(5x10^-8)/1-0.2

= (0.2 x 0.00000005)/0.8

= 1.25x10^-8m

At 0.5

0.5x(5x10^-8)/1-0.5

0.5x0.00000005/0.5

= 5x10^-8m

At 0.6

0.6x(5x10^-8)/1-0.6

0.6 x 0.00000005/0.4

= 7.5 x 10^-8m

At 0.8

0.8x(5x10^-8)/1-0.8

0.8x0.00000005/0.2

= 2x10^-7m

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