Biology Formulas

Question 1

Calculate the total magnification of a microscope if the eyepiece lens has a magnification of x15 and the objective lens has a magnification of x150.

Answer 1

x2250

Question 2

Calculate magnification if image size is 2 mm and the actual size is 400pm

Answer 2

x5000000

Question 3

Calculate rate if it takes 20 seconds for an enzyme reaction to take place

Answer 3

50s-1

Question 4

Energy = mass (g) * Temperature change* 4.2

Calculate the mass of the food if the energy is 2405J, and the water increased by 226C.

Answer 4

25.34g

Question 5

Calculate BMI of a 66.5 kg person who is 173.5cm.

Answer 5

22.09

Question 6

Calculate the waist to hip ratio of someone with a 73cm waist and a 80cm hip.

Answer 6

0.9125

Question 7

Calculate light intensity if the distance is 40cm

Answer 7

6.25x10-3

Question 8

Calculate the rate of diffusion if surface area is 10cm^2, concentration difference is 4 and the membrane is 0.05cm

Answer 8

800

Question 9

Calculate the stroke volume of an individual with a resting heart rate of 55bpm and a cardiac output of

Answer 9

4730cm3min-1

Question 10

Calculate efficiency if a greenfly has 15750kJ and ladybirds have 1200kJ.

Answer 10

7.6%