AP Biology Labs 3-4 Take-Home Exam
AP Exam time is fast
approaching! Try these teacher-tested, take-home tests to let your
students determine their readiness for the upcoming exams. These are
great for review after each lab or as a group as a final review.
Lab 3 (Mitosis and meiosis)
- List the cell cycle and describe what happens to the
chromosomal material in each step.
A)
B)
C)
D)
E)
- In which phase do cells spend most of their
time?_______________
- What is crossing over?
- Under a microscope you notice that about 33% of the asci show crossover.
Calculate the number of mapping units.
__________
- Draw a pair of chromosomes in MI and MII, and show how you
would get a 2:2:2:2 arrangement of ascospores by crossing
over.
Lab 4 (Plant pigments and photosynthesis)
- How does chromatography work?
- Using the table below calculate the Rf values for the
pigments. (The solvent front moved 100 mm.)
| Band # |
Distance (mm) |
Rf value |
| 1 |
10 |
|
| 2 |
35 |
|
| 3 |
42 |
|
| 4 |
66 |
|
- Some chloroplasts are collected. Half of them are boiled and the other half are left unboiled. Half of each of these collections are then placed into either dark or lighted situations. They are allowed to incubate and grow, and then they are placed into a spectrophotometer to measure the absorbance. Using the table below, estimate absorbance numbers that may go into the empty cells.
| Cuvette
| 0 |
10 |
20 |
30 |
| unboiled/dark
|
|
|
|
|
| unboiled/light
|
|
|
|
|
| boiled/light
|
|
|
|
|
| boiled/dark
|
|
|
|
|
| no chloroplasts (control)
|
|
|
|
|
- Plot the percent transmittance of your projected results.
Index to Exams
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