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WorksheetsBIOL 1406 - Lecture Quiz 9 - Photosynthesis
Total questions: 15
Worksheet time: 8mins
Which of the following statements describes a primary benefit of having photosystem reaction centers composed of several structurally different pigments?
This arrangement enables the reaction center to excite electrons to a higher energy level.
This arrangement enables the plant to absorb more photons from light energy, all of which are at the same wavelength.
This arrangement enables the plant to absorb light energy of a variety of wavelengths.
Excited electrons must pass through several pigments before they can be transferred to electron acceptors of the electron transport chain.
The oxygen released by photosynthesis is produced by which of the following processes?
splitting water molecules
the electron transfer system of photosystem II
chemiosmosis
the electron transfer system of photosystem I
Which of the following statements best describes the relationship between photosynthesis and cellular respiration?
Cellular respiration runs the biochemical pathways of photosynthesis in reverse.
Photosynthesis stores energy in complex organic molecules; cellular respiration releases energy from complex organic molecules.
Photosynthesis is catabolic; cellular respiration is anabolic.
Photosynthesis occurs only in plants; cellular respiration occurs only in animals.
Which of the following molecules will accumulate if light reactions occur normally, but the Calvin Cycle is inhibited?
ADP, Pi and NADP+
ATP and NADPH
H2O and O2
CO2 and glucose
Which of the following sequences correctly represents the flow of electrons during photosynthesis?
NADPH → electron transport chain → O2
NADPH → O2 → CO2
H2O → photosystem I → photosystem II
H2O → NADPH → Calvin cycle
Which of the following molecules best describes the primary form in which plants stockpile extra sugar produced by photosynthesis?
starch
sucrose
cellulose
glucose
Which of the following describes the function of the pigment molecules in a light-harvesting complex in the thylakoid membranes?
They absorb and transfer light energy to the reaction-center chlorophyll.
They transfer electrons to NADP+.
They split water and release oxygen from the reaction-center chlorophyll.
They synthesize ATP from ADP and Pi.
Which of the following processes is directly associated with photosystem I?
generating molecular oxygen
passing electrons to NADP+
receiving electrons from the thylakoid membrane electron transport chain
extracting hydrogen electrons from the splitting of water
Which of the following events is most immediately associated with the absorption of energy by chlorophyll molecules of the reaction-center complex?
NADP+ is reduced to NADPH.
A molecule of water is split.
ATP is synthesized from the energy absorbed.
An electron is excited.
A mutation that disrupts cyclic electron flow in the light reactions of photosynthesis will specifically reduce the production of which of the following molecules?
ATP
CO2
ADP and NADP+
NADPH
Which of the following observations would be the best indicator that an organism lacks photosystem II?
It does not produce CO2 in the dark.
It produces CO2 in the light.
It does not produce O2 in the light.
It produces glucose in the light and dark.
In a plant, which of the following reactions produces molecular oxygen (O2)?
the light reactions alone
the light reactions and the Calvin cycle
neither the light reactions nor the Calvin cycle
the Calvin cycle alone
Which of the following molecules is the final electron acceptor for electrons from photosystem I?
oxygen
carbon dioxide
chlorophyll in photosystem II
NADP+
Which of the following processes would be most directly affected if a thylakoid membrane is punctured so that the interior of the thylakoid is no longer separated from the stroma?
splitting of water
reduction of NADP+
synthesis of ATP
flow of electrons from photosystem II to photosystem I
Which of the following processes occurs in the Calvin cycle?
reduction of NADPH
reduction of CO2
production of ATP
release of oxygen
