BIO 110 EXAM 3 JOSEPH RICHARDS
EXAM QUESTIONS AND ANSWERS
What is Photosynthesis? - Correct Answers -Energy in light is captured to synthesize
carbohydrates
What is the chemical equation of photosynthesis? - Correct Answers -Light Energy +
6CO2 + 6H2O --> C6H12O6 (glucose) + 6O2
What is oxidized and reduced in photosynthesis? - Correct Answers -•H2O is oxidized
•CO2 is reduced
What kind of reaction is photosynthesis? - Correct Answers -endergonic
What drives photosynthesis? - Correct Answers -Energy from light
What is the biosphere? How is it powered? - Correct Answers -All regions on the Earth
where living organisms exist
Photosynthetic power
What is the energy cycle? - Correct Answers -The use of organic molecules for energy,
which is replenished by photosynthesis in plants
What are the 3 trophic levels? What do they mean? - Correct Answers -Heterotrophs:
Must eat food to sustain life
Autotrophs: Make organic molecules from inorganic sources for food
Photoautotrophs: Use light as a source of energy and CO2 as a carbon source
What is the chloroplast? - Correct Answers -Organelle in plant and algae cells that carry
out photosynthesis
What is chlorophyll? - Correct Answers -A green pigment found in the chloroplasts of
plants, algae, and some bacteria
Where does photosynthesis occur? - Correct Answers -Majority of photosynthesis
occurs internally in cells of leaves, in the mesophyll tissue
What is stomata? - Correct Answers -A pore in the leaf where Carbon dioxide enters
and oxygen exits the leaf
,What is the anatomy of the chloroplast membranes? - Correct Answers -Outer and inner
membrane is separated by the inter membrane space
What is the thylakoid membrane and what does it have? - Correct Answers -Membrane
bound compartment inside chloroplast
contains
pigment molecules
Membrane forms thylakoids
Enclose thylakoid lumen
Fluid filled space between the thylakoid membrane and inner membrane
What is a granum? - Correct Answers -stack of thylakoids
What is the stroma of a chloroplast? - Correct Answers -Fluid filled region between
thylakoid membrane and inner membrane
What is the first stage of photosynthesis? What does it use? Where does it take place?
What does it produce? - Correct Answers -Light Reactions
Light energy
Thylakoid membranes
ATP, NADPH, and O2
What is NADPH? How is it made? - Correct Answers -A similar molecule to NADH
NADP+ accepts 2 electrons and H+ to convert to NADPH
What is the second stage of photosynthesis? Where does it occur? How does it work? -
Correct Answers -The Calvin Cycle
Stroma
ATP and NADPH give electrons and energy to put CO2 into carbohydrate molecules
What is light a type of? - Correct Answers -Electromagnetic radiation
How does light travel? - Correct Answers -as waves
What do wavelengths imply about energy? - Correct Answers -Shorter wavelengths
have more energy
Longer wavelengths have less energy
, What is the range of the electromagnetic spectrum? What is on the two ends of the
spectrum? - Correct Answers -High energy and short wavelength to low energy and
long wavelength
Gamma waves and radio waves
What is the visible light spectrum? - Correct Answers -380 nm to 740 nm
Why are leaves green? - Correct Answers -They absorb red and violet light but reflect
green wavelengths
What do wavelengths of light depend on for pigments? - Correct Answers -Amount of
energy needed to boost an electron to a higher orbital
How does having different pigments impact plants? - Correct Answers -Allows plants to
absorb light as many different wavelengths
When a photon hits an electron, what happens? Is the electron then stable or unstable?
What does this process release? - Correct Answers -It boosts from the ground
(unexcited) state to a higher energy level (photoexcited)
Unstable
Energy as heat or light
What happens when electrons are captured by molecules? - Correct Answers -Excited
electrons are transferred to another molecule
What does chlorophylls a and b contain in its structure? - Correct Answers -A porphyrin
ring
What is the absorption spectrum? What does it affect? - Correct Answers -Wavelengths
that are absorbed by different pigments
Rate of photosynthesis by the whole plant at specific wavelengths
What is produced when light energy is transferred to other molecules? - Correct
Answers -Energy intermediate molecules for cellular work
What do thylakoid membranes of chloroplasts contain? What are they and when were
they discovered? - Correct Answers -Photosystem II (PSII); step 1 of photosynthesis,
discovered 2nd
Photosystem I (PSI); step 2 of photosynthesis, discovered 1st
What are the major details of Photosystem II? - Correct Answers -- Has pigment P680
EXAM QUESTIONS AND ANSWERS
What is Photosynthesis? - Correct Answers -Energy in light is captured to synthesize
carbohydrates
What is the chemical equation of photosynthesis? - Correct Answers -Light Energy +
6CO2 + 6H2O --> C6H12O6 (glucose) + 6O2
What is oxidized and reduced in photosynthesis? - Correct Answers -•H2O is oxidized
•CO2 is reduced
What kind of reaction is photosynthesis? - Correct Answers -endergonic
What drives photosynthesis? - Correct Answers -Energy from light
What is the biosphere? How is it powered? - Correct Answers -All regions on the Earth
where living organisms exist
Photosynthetic power
What is the energy cycle? - Correct Answers -The use of organic molecules for energy,
which is replenished by photosynthesis in plants
What are the 3 trophic levels? What do they mean? - Correct Answers -Heterotrophs:
Must eat food to sustain life
Autotrophs: Make organic molecules from inorganic sources for food
Photoautotrophs: Use light as a source of energy and CO2 as a carbon source
What is the chloroplast? - Correct Answers -Organelle in plant and algae cells that carry
out photosynthesis
What is chlorophyll? - Correct Answers -A green pigment found in the chloroplasts of
plants, algae, and some bacteria
Where does photosynthesis occur? - Correct Answers -Majority of photosynthesis
occurs internally in cells of leaves, in the mesophyll tissue
What is stomata? - Correct Answers -A pore in the leaf where Carbon dioxide enters
and oxygen exits the leaf
,What is the anatomy of the chloroplast membranes? - Correct Answers -Outer and inner
membrane is separated by the inter membrane space
What is the thylakoid membrane and what does it have? - Correct Answers -Membrane
bound compartment inside chloroplast
contains
pigment molecules
Membrane forms thylakoids
Enclose thylakoid lumen
Fluid filled space between the thylakoid membrane and inner membrane
What is a granum? - Correct Answers -stack of thylakoids
What is the stroma of a chloroplast? - Correct Answers -Fluid filled region between
thylakoid membrane and inner membrane
What is the first stage of photosynthesis? What does it use? Where does it take place?
What does it produce? - Correct Answers -Light Reactions
Light energy
Thylakoid membranes
ATP, NADPH, and O2
What is NADPH? How is it made? - Correct Answers -A similar molecule to NADH
NADP+ accepts 2 electrons and H+ to convert to NADPH
What is the second stage of photosynthesis? Where does it occur? How does it work? -
Correct Answers -The Calvin Cycle
Stroma
ATP and NADPH give electrons and energy to put CO2 into carbohydrate molecules
What is light a type of? - Correct Answers -Electromagnetic radiation
How does light travel? - Correct Answers -as waves
What do wavelengths imply about energy? - Correct Answers -Shorter wavelengths
have more energy
Longer wavelengths have less energy
, What is the range of the electromagnetic spectrum? What is on the two ends of the
spectrum? - Correct Answers -High energy and short wavelength to low energy and
long wavelength
Gamma waves and radio waves
What is the visible light spectrum? - Correct Answers -380 nm to 740 nm
Why are leaves green? - Correct Answers -They absorb red and violet light but reflect
green wavelengths
What do wavelengths of light depend on for pigments? - Correct Answers -Amount of
energy needed to boost an electron to a higher orbital
How does having different pigments impact plants? - Correct Answers -Allows plants to
absorb light as many different wavelengths
When a photon hits an electron, what happens? Is the electron then stable or unstable?
What does this process release? - Correct Answers -It boosts from the ground
(unexcited) state to a higher energy level (photoexcited)
Unstable
Energy as heat or light
What happens when electrons are captured by molecules? - Correct Answers -Excited
electrons are transferred to another molecule
What does chlorophylls a and b contain in its structure? - Correct Answers -A porphyrin
ring
What is the absorption spectrum? What does it affect? - Correct Answers -Wavelengths
that are absorbed by different pigments
Rate of photosynthesis by the whole plant at specific wavelengths
What is produced when light energy is transferred to other molecules? - Correct
Answers -Energy intermediate molecules for cellular work
What do thylakoid membranes of chloroplasts contain? What are they and when were
they discovered? - Correct Answers -Photosystem II (PSII); step 1 of photosynthesis,
discovered 2nd
Photosystem I (PSI); step 2 of photosynthesis, discovered 1st
What are the major details of Photosystem II? - Correct Answers -- Has pigment P680
