1. Semester 1 Review and Ap Exam REview

2. Extensive irrigation in arid regions causes salts to accumulate in the soil. (When water evaporates, salts that were dissolved in the water are left behind).
Based on what you have learned about water balance in plant cells, explain why increased soil salinity might be harmful to crops. Science vocab

3. The soil immediately around hot springs is much warmer than in neighboring regions. Two closely related species of native grasses are found, one in the warmer region and one in the cooler region. If you analyzed their membrane lipid compositions, what would you expect to find? Explain 5 pts

4. A biologist ground up some plant leaf cells and then centrifuged the mixture to fractionate the organelles. Organelles in one of the heavier fractions could produce ATP in the light, whereas organelles in the lighter fraction could produce ATP in the dark. The heavier and lighter fractions are most likely to contain, respectively,
mitochondria and chloroplasts.
B) chloroplasts and peroxisomes.
C) peroxisomes and chloroplasts.
D) chloroplasts and mitochondria.
E) mitochondria and peroxisomes

5. A biologist ground up some plant leaf cells and then centrifuged the mixture to fractionate the organelles. Organelles in one of the heavier fractions could produce ATP in the light, whereas organelles in the lighter fraction could produce ATP in the dark. The heavier and lighter fractions are most likely to contain, respectively,
mitochondria and chloroplasts.
B) chloroplasts and peroxisomes.
C) peroxisomes and chloroplasts.
D) chloroplasts and mitochondria.
E) mitochondria and peroxisomes

6. Must Knows Enzymes in genetics: DNA polymerase Ligase Helicase
topoisomerase

8. Answer is B

10. Answer is C

11. Must Knows Biotechnology: Techniques Terminology PCR Cloning
Gel electrophoresis
RFLP Analysis

13. Answers C D B A

15. Answer is D.