1)Take out an APPROVED calculator and formula sheet.

2)Pick a grid sheet. You will solve each problem and grid in the answer.

AP Biology Math Review 2013

TipsAllowed 3 minutes per question – aim for

half thatUse the formula sheetDon’t round until the endGrid LEFT to right

Look at HOW the answer should be given“round to nearest…”

.123The 1 is in the tenths placeThe 2 is in the hundreds placeThe 3 is in the thousandths place

Ready for #1 – set your timer

Q1: Chi Square A heterozygous red eyed female was

crossed with a red eyed male. The results are shown below. Red eyes are sex-linked dominant to white, determine the chi square value. Round to the nearest hundredth.

Phenotype # flies observed

Red Eyes 134

White Eyes 66

Chi Square StrategyObserved – actual dataExpected – complete a punnet square to determine the expected #

Plug in +

Expected XR Xr

XR

YY Y

XR Xr

Xr

XR

XR

XR

Observed—134 red eyes, 66 white eyes

+

Chi-Squarered white

(134-150)2

/150

(66-50)2

/50

3:1 ratio

134+ 66=200

150 red

50 white

1.70666 +

+

5.12

6.83

Ready for #2 – set your timer

Q2: Surface Area and VolumeWhat is the SA/V for this cell? Round your

answer to the nearest hundredths.

Q2

SA= 4 r2

=4(3.14) 52

=314Volume of a sphere= 4/3 r3

=4/3 (3.14)53

=523.33

SA/V=314/523.33

=.60

Ready for #3 – set your timer

Q3: Water Potential and Solution Potential

Solute potential= –iCRT

i = The number of particles the molecule will make in water; for NaCl this would be 2; for sucrose or glucose, this number is 1

C = Molar concentration (from your experimental data) R = Pressure constant = 0.0831 liter bar/mole K T = Temperature in degrees Kelvin = 273 + °C of solution

Sample Problem The molar concentration of a sugar solution in

an open beaker has been determined to be 0.3M. Calculate the solute potential at 27 degrees celsius. Round your answer to the nearest tenths.

Q3Solute potential= –iCRT-i= 1 (sugar is 1, salt is 2)C= 0.3R = Pressure constant = 0.0831T= 27 +273=300K

Solute concentration= -7.5

Ready for #4 – set your timer

Q4: Hardy WeinbergA census of birds nesting on a Galapagos

Island revealed that 24 of them show a rare recessive condition that affected beak formation. The other 63 birds in this population show no beak defect. If this population is in HW equilibrium, what is the frequency of the dominant allele? Give your answer to the nearest hundredth

Hardy Weinberg StrategyFigure out what you are given

Allele (p or q) or Genotypes (p2, 2pq, q2)Figure out what you are solving for Manipulate formulas to go from given to

solving forAlways dealing with decimals

Q4:Looking for p—dominant allele

Homozygous Recessive=q2=24/87= .2758

q2= .2758q= .5252

p+q=1

p=.47

Ready for #5 – set your timer

Q5: Rate

Hydrogen peroxide is broken down to water and oxygen by the enzyme catalase. The following data were taken over 5 minutes. What is the rate of enzymatic reaction in mL/min from 2 to 4 minutes? Round to the nearest hundreds

Time (mins

)

Amount of O2

produced (mL)

1 2.3

2 3.6

3 4.2

4 5.5

5 5.9

Q5

Rise/run= rate= 5.5-3.6/4-2

Rise/run= rate=1.9/2Rise/run= rate= .95

Ready for #6 – set your timer

Q6: Laws of ProbabilityCalculate the probability of tossing three coins simultaneously and obtaining three heads. Express in fraction form.

Q6Probability of a heads is ½Probability of heads AND a heads AND a

heads

½ X ½ X ½ =1/8

Ready for #7 – set your timer

Q7: Population GrowthN—total number in pop r—rate of growth

There are 2,000 mice living in a field. If 1,000 mice are born each month and 200 mice die each month, what is the per capita growth rate of mice over a month? Round to the nearest tenths.

dN/dt = rN(1000 – 200) = r (2000)

800/2000= r = 0.4

Net Primary Productivity in an ecosystem is equal to the Gross Primary Productivity

minus the Cellular Respiration requirements of the producers…

Net PP = Gross PP - R

Ready for #8 – set your timer

Q8The net annual primary productivity of a

particular wetland ecosystem is found to be 8,000 kcal/m2. If respiration by the aquatic producers is 12,000 kcal/m2per year, what is the gross annual primary productivity for this ecosystem, in kcal/m2 per year? Round to the nearest whole number.

Q8NetPP=GrossPP-Respiration

8,000 = GrossPP – 12,000 8,000 + 12,000= GrossPP20,000=GrossPP

The Q10 temperature coefficient is a measure of the rate of change of a biological system as a consequence of increasing the temperature by

10 °C.

We have not done any of these problems before so quickly find the Q10 equation on your AP

Biology Formula Sheet and review it. When you are ready try #9!

Ready for #9 – set your timer

Q9: Q10

Temperature (C) Respiration Rate(Minute)

16 16

21 22

Data taken to determine the effect of temperature on the rate of respiration in a goldfish is given in the table below. Calculate Q10 for this data. Round to the nearest whole number.

Q9

Q10= ( 22 /16) 10/(21-16)

Q10= (1.375) 2

Q10= 2

Ready for #10 – set your timer

Q10:Standard Deviation Grasshoppers in Madagascar show variation

in their back-leg length. Given the following data, determine the standard deviation for this data. Round the answer to the nearest hundredth.

Length(cm): 2.0, 2.2, 2.2, 2.1, 2.0, 2.4 and 2.5

Calculate the mean of your data set. 2.0 + 2.2 + 2.2 +2.1+ 2.0 + 2.4 +2.5 = 2.2 7

Subtract the mean from each of the data values and list the differences.

(2.0 - 2.2), (2.2–2.2), (2.2-2.2), (2.1-2.2), (2.0-2.2), (2.4-2.2), (2.5-2.2)

-.2 + 0 + 0 + -.1 + -.2 + .2 + .3Square each of the differences from the previous step and make a list of the squares.

.04 + 0 + 0 + .01 + .04 + .04 + .09 In other words, multiply each number by itself. Be

careful with negatives. A negative times a negative makes a positive. Add the squares from the previous step together.

.04 + 0 + 0 + .01 + .04 + .04 + .09 = 0.22 Subtract one from the number of data values you started with.

7 – 1 = 6 Divide the sum from step four by the number from step five.

0.22 / 6 = 0.0366Take the square root of the number from the previous step. This is the standard deviation. 0.0366 = 0.19131126469, or 0.2

Creating dilutions…

We have not done any of these problems before so quickly find the dilution equation

on your AP Biology Formula Sheet and review it. When you are ready try #11!

Ready for #11 – set your timer

Q11: DilutionJoe has a 2 g/L solution. He dilutes it and creates 3 L of a 1 g/L solution. How much of the original solution did he dilute? Round to the nearest tenths.

We are looking for V1:

CiVi = CfVf 2Vi = 1(3)Vi= 1.5

Last one! Let’s try a Gibbs Free Energy Problem. Take a moment to review the

equation on the formula sheet.

Ready for #12 – set your timer

Q12: Gibbs Free EnergyDetermine the ∆G in kJ/mol for the

following reaction:

N2 + 3H2 -> 2NH3

At 293°K the Δ in enthalpy is -9.2x104 J/mol and the Δ in entropy is -199 J/K.

Q12: AnswerΔ G = Δ H - T ( Δ S) = (-92000J/mol ) – (293K)(-199 J/K)

= -33096

The last equation on the Formula sheet is for pH. Review the formula.

You can not solve this equation easily with a primary calculator so I doubt you will be asked to do so on

the exam. HOWEVER, you should be comfortable with pH and be able to apply the formula when needed.

#13

Q13: pHDetermine the pH of a 0.0034M NHO3

solution.

Q13: AnswerpH = -log(H+) = -log(0.0034) = 2.47