Worksheets10.3 & 10.4 Discussion Advanced Bio
Total questions: 9
Worksheet time: 14mins
Of the following, which occurs during the Calvin cycle?
Light energy is converted to chemical energy
ATP and NADPH are synthesized.
CO2 is reduced.
Excited electrons are conveyed from chlorophyll to an electron acceptor.
Photons are absorbed.
Rubisco is _____.
the enzyme in plants that first captures CO2 to begin the Calvin cycle
the enzyme responsible for splitting H2O to produce O2 in photosynthesis
the enzyme that forms a 4-carbon compound in CAM metabolism
the first stable intermediate in CAM metabolism
the 5-carbon sugar molecule that reacts with CO2 to begin the Calvin cycle
In the Calvin cycle, CO2 is combined _____.
with a 2-carbon compound to form a 3-carbon compound
with a 5-carbon compound to form an unstable 6-carbon compound, which decomposes into two 3-carbon compounds
with a 7-carbon compound to form two 4-carbon compounds
with a 5-carbon compound to form a stable 6-carbon compound that can be converted directly to glucose
with two 2-carbon compounds to form a 5-carbon compound
Glyceraldehyde-3-phosphate (G3P) is produced in the stroma of chloroplasts. Which of the following statements is true about this compound?
It is produced from glucose during glycolysis.
It is a 3-carbon sugar.
For every three molecules of CO2, six molecules of G3P are formed but only one molecule exits the cycle to be used by the plant cell.
For every three molecules of CO2, six molecules of G3P are formed but five molecules must be recycled to regenerate three molecules of RuBP
All of the above.
Which of the following statements correctly describes the relationship between the light reactions and the Calvin cycle?
The light reactions produce carbon dioxide, ATP, NADPH, all of which are used in the Calvin cycle.
The light reactions produce ATP and NADPH, both of which are used in the Calvin cycle.
The light reactions produce ADP and NADP+, both of which are used in the Calvin cycle.
The light reactions produce water, ATP, NADPH, all of which are used in the Calvin cycle.
The light reactions produce carbon dioxide and water all of which are used in the Calvin cycle.
What is the role of NADP+ in photosynthesis?
It helps produce ATP from the light reactions.
It absorbs light energy.
It forms part of photosystem II.
It is the primary electron acceptor.
It forms NADPH to be used in the Calvin cycle.
The use of non-C3 and non-CAM plants as crops may be limited in some regions because on hot, dry days, they close their stomata. What happens as a result of closing their stomata?
It reduces water loss.
It prevents carbon dioxide from entering the leaf.
In a process called photorespiration, rubisco binds oxygen instead of carbon dioxide.
It builds up oxygen from the light reactions in the leaf.
all of the above
Why are C4 plants more suited to hot climates than C3 plants?
They do not close their stomata in hot, dry weather.
Unlike C3 plants, they keep fixing carbon dioxide even when the concentration of carbon dioxide in the leaf is low.
They evolved in cold weather but migrated to the tropics where they were more suitable.
They suspend photosynthesis in the heat.
The same cells that bind carbon dioxide perform the Calvin cycle.
You have a large, healthy philodendron that you carelessly leave in total darkness while you are away on vacation. You are surprised to find that it is still alive when you return. What has the plant been using for an energy source while in the dark?
Even though it can't carry out the light reactions, the plant can still produce sugars because the Calvin cycle doesn't require light.
While it did have access to light, the plant stored energy in the form of sugars or starch, and it was able to derive energy from the stored molecules during your vacation.
Even though the plant received no visible light, it was able to use the short-wave part of the electromagnetic spectrum (gamma rays and X-rays) to carry out photosynthesis.
When light energy is not available, plants can derive energy from inorganic molecules.
none of the above
