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In the overall reaction describing photosynthesis, which class of compounds is represented in one of the products?
Carbohydrates
Conversion of carbon dioxide into carbohydrates relies on energy from
ATP
Wheat, roses, and rice are examples of
C3 plants
Which sequence gives the correct flow of energy?
Sun → autotrophs → heterotrophs
The final electron acceptor in noncyclic electron transport is
NADP+
If four molecules of ribulose bisphosphate (RuBP) were added to a solution containing rubisco and CO2, what would be the products of the reaction?
Eight molecules of 3PG
The carboxylation reaction of PEP carboxylase produces
oxaloacetate only
To study the mechanism of excitation in the reaction center of a photosystem, on what timescale would you need to capture data?
Picoseconds (10-12 sec)
Metabolic pathways are somewhat like roadways: A metabolic path may be one-way or two-way. It may contain intersections that connect many different pathways, or it may be isolated, with a dead end, and only connect to one other pathway. What roadway analogy could be used to describe the location of glyceraldehyde 3-phosphate (G3P, product of the Calvin cycle) in plant cell metabolism?
At the intersection of several busy superhighway
Light is needed for photosynthesis, because it
provides a source of energy for making chemical bonds
A species of plant is found to use both cyclic and noncyclic photophosphorylation. Which outcome is most likely for this plant if cyclic photophosphorylation is completely inhibited?
It will experience impaired growth and development
Which statement about ribulose bisphosphate carboxylase/oxygenase (rubisco) is false?
it produces a four-carbon product
What are stomata?
Adjustable pores on a leaf that allow CO2 to enter and O2 and water to exit
How many six-carbon sugar molecules are produced by the Calvin cycle when 18 CO2 are fixed?
3
Which molecule(s) shuttle(s) between the mesophyll and bundle sheath cells in C4 plants during carbon fixation?
A four-carbon molecule and a three-carbon molecule
The Calvin cycle is linked to glycolysis by which intermediate?
Glyceraldehyde 3-phosphate (G3P)
Which statement can be used to describe PEP carboxylase but cannot be used to describe rubisco?
Enzymatic activity is independent of oxygen concentration
Suppose atmospheric carbon dioxide levels rise dramatically in the future. How do you predict this will affect competition between C3 and C4 plants?
C3 plants will outcompete C4 plants, since C4 plants must use more energy in the carbon fixation phase of photosynthesis than C3 plants
Photosynthesis and cellular respiration are connected through which pathways?
Calvin cycle and glycolysis
Photosynthetic efficiency is affected by the
orientation of a plant's leaves to the sun.
Photosystem I (PSI) and photosystem II (PSII) have similarities and differences. Which statement comparing these two systems is true?
Both PSI and PSII reaction centers draw electrons from electron donors after they are excited by photons and oxidized
t has been estimated that only about 5 percent of the sun's energy that reaches Earth is captured as chemical energy in the form of carbohydrates via photosynthesis. How much of the sun's energy reaching Earth do you estimate is stored in the cells of nonphotosynthetic organisms?
Above 0 but well below 5 percent
Which statement is true regarding the Calvin cycle?
Twelve NADPH are required for every 6 CO2 fixed
During carbon fixation in corn, oxaloacetate is converted to malate, which then moves by _______ from the mesophyll cell to the bundle sheath cell
diffusion
Light-harvesting complexes were isolated and analyzed from a red alga. It is likely that the alga got its red color from
phycobilins because they absorb yellow-green, yellow, and orange light
When the pH of the stroma shifts from 7 to 8 under illumination
rubisco becomes activated
In the equation, 12 H2O → 24 H+ + 24 e- + 6 O2,
water is oxidized
