BIO250 - Exam 3 UPDATED ACTUAL
Exam Questions and CORRECT Answers
photosynthesis - CORRECT ANSWER - 6CO2 + 6H2O + light energy → C6H12O6 +
6O2
reduction in photosynthesis - CORRECT ANSWER - CO2 → glucose
oxidation in photosynthesis - CORRECT ANSWER - H2O → O2
reduction - CORRECT ANSWER - gain of electrons (H+)
oxidation - CORRECT ANSWER - loss of electrons (H+)
stomata - CORRECT ANSWER - - pores on the leaf where O2 exits and CO2 enters
- underside of leaves
- opens when guard cells are turgid
Chloroplasts - CORRECT ANSWER - outermembrane
intermembrane space
inner membrane
stroma
thylakoids
grana
lumen
stroma - CORRECT ANSWER - fluid portion of the chloroplast; outside of the thylakoids
,thylakoids - CORRECT ANSWER - A flattened membrane sac that form disks inside the
chloroplast, used to convert light energy to chemical energy.
grana - CORRECT ANSWER - the stacks of thylakoids embedded in the stroma of a
chloroplast.
lumen - CORRECT ANSWER - inside the thylakoid
chloroplasts - CORRECT ANSWER - semiautonomous organelles
- capture light for photosynthesis
- synthesize organic molecules
parenchyma / mesophyll - CORRECT ANSWER - Most of the photosynthesis in plants
takes place in specialized __________ cells called the __________.
palisade parenchyma - CORRECT ANSWER - - top portion of the leaf below the upper
epidermis
- area with tighly packed cells with many chloroplasts
- specilizes in capturing light energy
spongy parenchyma - CORRECT ANSWER - - lower portion of leaf
- many air spaces that connect to stomata
- facilitates gas exchange
photons - CORRECT ANSWER - massless particles that travel in wavelengths
longer wave = less energy
pigments are mol - CORRECT ANSWER - photons (light energy)
, chlorophyll - CORRECT ANSWER - plant pigment have porhyin ring and phytol tail
phytol tail - CORRECT ANSWER - long hydrocarbon chain that embeds in thylakoid
membrane (non polar anchor)
porhyin ring - CORRECT ANSWER - Mg atom captures light energy
chlorophyll a - CORRECT ANSWER - - absorbs red light more effectively
- 3x more abundant in plant
- appears blue-green
chlorophyll b - CORRECT ANSWER - - absorbs blue light more effectively
- appears yellow-green
accessory pigments - CORRECT ANSWER - - pigments that can absorb green light and
add color to fruits/flowers
carotenoids - CORRECT ANSWER - An accessory pigment, either yellow or orange, in
the chloroplasts of plants.
- absorbs wavelengths of light that chlorophyll cannot, carotenoids broaden the spectrum of
colors that can drive photosynthesis.
goal of photosystems - CORRECT ANSWER - collect energy from the light & boost the
e-
photosystems - CORRECT ANSWER - large complexes of both proteins and pigments
- embedded in the thylakoid membrane
Exam Questions and CORRECT Answers
photosynthesis - CORRECT ANSWER - 6CO2 + 6H2O + light energy → C6H12O6 +
6O2
reduction in photosynthesis - CORRECT ANSWER - CO2 → glucose
oxidation in photosynthesis - CORRECT ANSWER - H2O → O2
reduction - CORRECT ANSWER - gain of electrons (H+)
oxidation - CORRECT ANSWER - loss of electrons (H+)
stomata - CORRECT ANSWER - - pores on the leaf where O2 exits and CO2 enters
- underside of leaves
- opens when guard cells are turgid
Chloroplasts - CORRECT ANSWER - outermembrane
intermembrane space
inner membrane
stroma
thylakoids
grana
lumen
stroma - CORRECT ANSWER - fluid portion of the chloroplast; outside of the thylakoids
,thylakoids - CORRECT ANSWER - A flattened membrane sac that form disks inside the
chloroplast, used to convert light energy to chemical energy.
grana - CORRECT ANSWER - the stacks of thylakoids embedded in the stroma of a
chloroplast.
lumen - CORRECT ANSWER - inside the thylakoid
chloroplasts - CORRECT ANSWER - semiautonomous organelles
- capture light for photosynthesis
- synthesize organic molecules
parenchyma / mesophyll - CORRECT ANSWER - Most of the photosynthesis in plants
takes place in specialized __________ cells called the __________.
palisade parenchyma - CORRECT ANSWER - - top portion of the leaf below the upper
epidermis
- area with tighly packed cells with many chloroplasts
- specilizes in capturing light energy
spongy parenchyma - CORRECT ANSWER - - lower portion of leaf
- many air spaces that connect to stomata
- facilitates gas exchange
photons - CORRECT ANSWER - massless particles that travel in wavelengths
longer wave = less energy
pigments are mol - CORRECT ANSWER - photons (light energy)
, chlorophyll - CORRECT ANSWER - plant pigment have porhyin ring and phytol tail
phytol tail - CORRECT ANSWER - long hydrocarbon chain that embeds in thylakoid
membrane (non polar anchor)
porhyin ring - CORRECT ANSWER - Mg atom captures light energy
chlorophyll a - CORRECT ANSWER - - absorbs red light more effectively
- 3x more abundant in plant
- appears blue-green
chlorophyll b - CORRECT ANSWER - - absorbs blue light more effectively
- appears yellow-green
accessory pigments - CORRECT ANSWER - - pigments that can absorb green light and
add color to fruits/flowers
carotenoids - CORRECT ANSWER - An accessory pigment, either yellow or orange, in
the chloroplasts of plants.
- absorbs wavelengths of light that chlorophyll cannot, carotenoids broaden the spectrum of
colors that can drive photosynthesis.
goal of photosystems - CORRECT ANSWER - collect energy from the light & boost the
e-
photosystems - CORRECT ANSWER - large complexes of both proteins and pigments
- embedded in the thylakoid membrane
