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Life, 4/e

Ricki Lewis, University of New York at Albany
Mariëlle Hoefnagels, University of Oklahoma
Douglas Gaffin, University of Oklahoma
Bruce Parker, Utah Valley State College

Photosynthesis

Chapter Quiz


1	Which of the following is not necessary for photosynthesis to occur?
		A)	carbon dioxide
		B)	water
		C)	oxygen
		D)	light


2	A billion years ago, how did the evolution of photosynthesis forever change the earth?
		A)	decreased the concentration of carbon dioxide in the atmosphere
		B)	lowered global temperature
		C)	presence of atmospheric oxygen allowed aerobic respiration to evolve
		D)	All of these are correct.


3	How much of the sun’s light is used in photosynthesis?
		A)	1%
		B)	17%
		C)	19%
		D)	50%


4	Choose the correct statement about the electromagnetic spectrum.
		A)	A photon’s energy is directly proportional to the wavelength of light.
		B)	Photons travel in straight lines.
		C)	The wavelength of visible light ranges from 390 to 760 nanometers.
		D)	All of these are correct.


5	True or false. Green light is the most effective for photosynthesis.
		A)	True
		B)	False


6	What is the primary photosynthetic pigment in plants?
		A)	chlorophyll a
		B)	chlorophyll b
		C)	xanthophylls
		D)	carotenoids


7	Why do photosynthetic organisms have several types of pigments?
		A)	the additional pigments provide camouflage
		B)	different pigments extend the range of wavelengths the organism can harness
		C)	extra pigments are sometimes toxic, providing protection from predators
		D)	additional pigments make the plant more nutritious for its predators


8	Specifically, where are the chlorophyll molecules located within chloroplasts?
		A)	within the thylakoid spaces
		B)	in the stroma
		C)	thylakoid membranes
		D)	cristae


9	True or false. A photosystem is a complex of photon-harvesting chlorophyll molecules.
		A)	True
		B)	False


10	True or false. Both eukaryotes and prokaryotes have two kinds of reaction center chlorophylls, each in a different photosystem
		A)	True
		B)	False


11	True or false. Photosystem II functions before photosystem I.
		A)	True
		B)	False


12	Which of the following is not a product of the light reaction?
		A)	ATP
		B)	NADPH
		C)	water
		D)	oxygen


13	What is chemiosmotic phosphorylation?
		A)	Chemiosmotic phosphorylation is the osmosis of phosphates across a selectively permeable membrane.
		B)	The coupling of ATP formation to a proton gradient across a membrane is called chemiosmotic phosphorylation.
		C)	Chemiosmotic phosphorylation occurs when electrolytes build up within chloroplasts, creating hypertonic conditions.
		D)	Movement of water through the chemicals of the thylakoid membrane is chemiosmotic phosphorylation.


14	True or false. Photosynthetic prokaryotic organisms have only one photosystem but extract the same amount of energy as do the two photosystems of eukaryotes.
		A)	True
		B)	False


15	The primary function of the Calvin Cycle is to incorporate ____________ atoms into the cell.
		A)	oxygen
		B)	nitrogen
		C)	phosphate
		D)	carbon


16	The enzyme that catalyzes the reaction between ribulose bisphosphate and carbon dioxide is _________.
		A)	lipase
		B)	pepsin
		C)	maltose
		D)	rubisco


17	True or false. Calvin employed the 14C isotope to identify what was occurring in the C3 cycle.
		A)	True
		B)	False


18	True or false. Carbon dioxide concentration is a limiting factor of C3 photosynthesis.
		A)	True
		B)	False


19	Where is most malic acid found in C4 plants?
		A)	stomata
		B)	palisade cells
		C)	mesophyll cells
		D)	cuticle


20	How does CAM photosynthesis differ from C3 or C4 photosynthesis?
		A)	In CAM photosynthesis, malic acid is formed at night and stored in large vacuoles in cells housing chloroplasts.
		B)	CAM photosynthesis continues at night, while C3 and C4 photosynthesis occur during daylight only.
		C)	CAM photosynthesis extracts carbon from organic compounds.
		D)	CAM plants must use large quantities of water for photosynthesis.


21	True or false. Most plants use a combination of C3, C4, and CAM photosynthesis.
		A)	True
		B)	False

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