AP BIOLOGY FINAL STUDY GUIDE
EXAM UNIT 3 QUESTIONS AND
ANSWERS
light dependent reactions - ANSWER--what starts the light dependent reaction- light
energy
-what is created- two molecules needed for the next stage of photosynthesis (ATP
and NADPH)
-where it takes place- in plants the light reaction takes place in the thylakoid
membranes of organelles called chloroplasts
light independent reactions - ANSWER--what starts it-CO2, an enzyme called
ribulose bisphosphate carboxylase, adn three molecules of ribore bisphosphate
-What is created- chemical bonds, ATP and NADPH
-where it takes place- in the stroma, outside the thylakoid membrane
what is the overall reaction for PS - ANSWER-6CO2 + 6H20 + light = C6H1206 +6O
what organisms can perform photosynthesis - ANSWER-plants
How did photosynthesis evolve? - ANSWER-the biochemical capacity to use water
as the source of electrons in photosynthesis evolved in a common ancestor of extant
cyanobacteria, the geological record indicates that this transforming event took place
early in Earth's history at least 2450-2321 million years ago
How are Photosystems II and I different? What colors of light do they like to absorb?
- ANSWER--photosystem I- absorbs the longer wavelength of light which is 700 nm
-photosystem II- absorbs the shorter wavelengths of light which is 680 nm
Glycolysis - ANSWER--starts- one molecule of glucose
-what is created- two pyruvates, four ATP molecules, and two molecules of NADH
-where it takes place- cytoplasm, within the mitochondrion, the citric acid cycle
occurs in the mitochondrial matrix, and oxidative metabolism occurs at the internal
folded mitochondrial membrane
Krebs Cycle (Citric Acid Cycle) - ANSWER--starts- acetyl-CoA and combines with a
four carbon molecule called OAA
-what is created- citric acid, which has six carbon atoms
EXAM UNIT 3 QUESTIONS AND
ANSWERS
light dependent reactions - ANSWER--what starts the light dependent reaction- light
energy
-what is created- two molecules needed for the next stage of photosynthesis (ATP
and NADPH)
-where it takes place- in plants the light reaction takes place in the thylakoid
membranes of organelles called chloroplasts
light independent reactions - ANSWER--what starts it-CO2, an enzyme called
ribulose bisphosphate carboxylase, adn three molecules of ribore bisphosphate
-What is created- chemical bonds, ATP and NADPH
-where it takes place- in the stroma, outside the thylakoid membrane
what is the overall reaction for PS - ANSWER-6CO2 + 6H20 + light = C6H1206 +6O
what organisms can perform photosynthesis - ANSWER-plants
How did photosynthesis evolve? - ANSWER-the biochemical capacity to use water
as the source of electrons in photosynthesis evolved in a common ancestor of extant
cyanobacteria, the geological record indicates that this transforming event took place
early in Earth's history at least 2450-2321 million years ago
How are Photosystems II and I different? What colors of light do they like to absorb?
- ANSWER--photosystem I- absorbs the longer wavelength of light which is 700 nm
-photosystem II- absorbs the shorter wavelengths of light which is 680 nm
Glycolysis - ANSWER--starts- one molecule of glucose
-what is created- two pyruvates, four ATP molecules, and two molecules of NADH
-where it takes place- cytoplasm, within the mitochondrion, the citric acid cycle
occurs in the mitochondrial matrix, and oxidative metabolism occurs at the internal
folded mitochondrial membrane
Krebs Cycle (Citric Acid Cycle) - ANSWER--starts- acetyl-CoA and combines with a
four carbon molecule called OAA
-what is created- citric acid, which has six carbon atoms
