AP BIO UNIT 3 TEST QUESTIONS WITH
COMPLETE ANSWERS
Obligate Anaerobes - Answer-Organisms that cannot live where molecular oxygen is
present.
facultative Anaerobes - Answer-can live with or without oxygen
Autotrophs - Answer-organisms that make their own food
Photosynthesis - Answer-process by which plants use the sun's energy to convert water
and carbon dioxide into sugars
Heterotrophs - Answer-an organism that depends on complex organic substances for
nutrition
Stomata - Answer-the small openings on the undersides of most leaves through which
oxygen and carbon dioxide can move
Stroma - Answer-thick fluid contained in the inner membrane of a chloroplast
Thylakoids - Answer-A flattened membrane sac inside the chloroplast, used to convert
light energy to chemical energy.
grana - Answer-stacks of thylakoids
Light Reactions - Answer-reactions of photosynthesis that use energy from light to
produce ATP and NADPH
Calvin Cycle - Answer-cycle in photosynthesis that reduces fixed carbon to
carbohydrates through the addition of electrons ("dark cycle")
Carbon Fixation - Answer-The incorporation of carbon from carbon dioxide into an
organic compound by an autotrophic organism.
Electromagnetic Spectrum - Answer-All of the frequencies or wavelengths of
electromagnetic radiation
Wavelength - Answer-The distance between crests of waves, such as those of the
electromagnetic spectrum.
Photon - Answer-a quantum of electromagnetic radiation
COMPLETE ANSWERS
Obligate Anaerobes - Answer-Organisms that cannot live where molecular oxygen is
present.
facultative Anaerobes - Answer-can live with or without oxygen
Autotrophs - Answer-organisms that make their own food
Photosynthesis - Answer-process by which plants use the sun's energy to convert water
and carbon dioxide into sugars
Heterotrophs - Answer-an organism that depends on complex organic substances for
nutrition
Stomata - Answer-the small openings on the undersides of most leaves through which
oxygen and carbon dioxide can move
Stroma - Answer-thick fluid contained in the inner membrane of a chloroplast
Thylakoids - Answer-A flattened membrane sac inside the chloroplast, used to convert
light energy to chemical energy.
grana - Answer-stacks of thylakoids
Light Reactions - Answer-reactions of photosynthesis that use energy from light to
produce ATP and NADPH
Calvin Cycle - Answer-cycle in photosynthesis that reduces fixed carbon to
carbohydrates through the addition of electrons ("dark cycle")
Carbon Fixation - Answer-The incorporation of carbon from carbon dioxide into an
organic compound by an autotrophic organism.
Electromagnetic Spectrum - Answer-All of the frequencies or wavelengths of
electromagnetic radiation
Wavelength - Answer-The distance between crests of waves, such as those of the
electromagnetic spectrum.
Photon - Answer-a quantum of electromagnetic radiation
