Lesson 2

1. 1Which of the following are products of the light reactions of photosynthesis that are utilized in the Calvin cycle?

   1. Aelectrons and H+
   2. BADP, Pi, and NADP+
   3. CCO2 and glucose
   4. DATP and NADPH
   5. EH2O and O2
2. 2A plant has a unique photosynthetic pigment. The leaves of this plant appear to be reddish yellow. What wavelengths of visible light are being absorbed by this pigment?

   1. Agreen and yellow
   2. Bred and yellow
   3. Cgreen, blue, and yellow
   4. Dblue, green, and red
   5. Eblue and violet
3. 3Compared to C3 plants, C4 plants

   1. Agrow better under cool, moist conditions
   2. Bdo not use rubisco for carbon fixation
   3. Chave higher rates of photorespiration
   4. Dmake a four-carbon compound, oxaloacetate, which is then delivered to the citric acid cycle in mitochondria
   5. Ecan continue to fix CO2 even at relatively low CO2 concentrations and high oxygen concentrations
4. 4What wavelength of light in the figure is most effective in driving photosynthesis?

   

   1. A730 nm
   2. B475 nm
   3. C625 nm
   4. D575 nm
   5. E420 nm
5. 5CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they

   1. Ause photosystem I and photosystem II at night
   2. Bfix CO2 into organic acids during the night
   3. Cfix CO2 into pyruvate in the mesophyll cells
   4. Duse the enzyme phosphofructokinase, which outcompetes rubisco for CO2
   5. Efix CO2 into sugars in the bundle-sheath cells
6. 6In the process of carbon fixation, RuBP attaches a CO2 to produce a six-carbon molecule, which is then split to produce two molecules of 3-phosphoglycerate. After phosphorylation and reduction produces glyceraldehyde 3-phosphate (G3P), what more needs to happen to complete the Calvin cycle?

   1. Ainactivation of RuBP carboxylase enzyme
   2. Bregeneration of ATP from ADP
   3. Cregeneration of NADP+
   4. Daddition of a pair of electrons from NADPH
   5. Eregeneration of RuBP
7. 7Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?

   1. AThe light reactions provide ATP and NADPH to the carbon fixation step of the Calvin cycle, and the cycle provides water and electrons to the light reactions
   2. BThe light reactions provide ATP and NADPH to the Calvin cycle, and the cycle returns ADP, Pi, and NADP+ to the light reactions
   3. CThe light reactions supply the Calvin cycle with CO2 to produce sugars, and the Calvin cycle supplies the light reactions with sugars to produce ATP
   4. DThere is no relationship between the light reactions and the Calvin cycle
   5. EThe light reactions provide the Calvin cycle with oxygen for electron flow, and the Calvin cycle provides the light reactions with water to split
8. 8Where does the Calvin cycle take place?

   1. Ainterior of the thylakoid (thylakoid space)
   2. Bstroma of the chloroplast
   3. Cthylakoid membrane
   4. Dcytoplasm surrounding the chloroplast
   5. Eouter membrane of the chloroplast
9. 9Which molecule(s) of the Calvin cycle is (are) also found in glycolysis?

   

   1. AB, C, and E only
   2. B3-phosphoglycerate only
   3. CB, C, E, and 3-phosphoglycerate
   4. DE only
   5. EB, C, D, and 3-phosphoglycerate only
10. 10CO2 + H2O → [CH2O] + O2 represents the simplified equation for

    1. Arespiration
    2. Bchemiosmosis
    3. Cphotosynthesis
    4. Dphotophosphorylation
    5. Echemisynthesis

11. 11Which of the following statements is true concerning the figure above?

    

    1. AIt represents the type of cell structures found in CAM plants
    2. BIt represents an adaptation that maximizes photorespiration
    3. CIt represents cell processes involved in C4 photosynthesis
    4. DIt represents a C3 photosynthetic system
    5. EIt represents a relationship between plant cells that photosynthesize and those that cannot
12. 12The NADPH required for the Calvin cycle comes from

    1. Aoxidative phosphorylation
    2. Breactions initiated in photosystem II
    3. Creactions initiated in photosystem I
    4. Dthe citric acid cycle
    5. Eglycolysis
13. 13Why are C4 plants able to photosynthesize with no apparent photorespiration?

    1. AThey use PEP carboxylase to initially fix CO2
    2. BThey are adapted to cold, wet climates
    3. CThey exclude oxygen from their tissues.
    4. DThey conserve water more efficiently.
    5. EThey do not participate in the Calvin cycle.
14. 14Which of the events listed below occurs in the light reactions of photosynthesis?

    1. ANADP is produced.
    2. BLight is absorbed and funnelled to reaction-centre chlorophyll a.
    3. CNADPH is reduced to NADP+.
    4. DCarbon dioxide is incorporated into PGA.
    5. EATP is phosphorylated to yield ADP.
15. 15In a plant leaf, the reactions that produce NADH occur in

    1. Aboth the light reactions and the Calvin cycle.
    2. Bneither the light reactions nor the Calvin cycle.
    3. Cthe Calvin cycle alone.
    4. Dthe chloroplast, but are not part of photosynthesis.
    5. Ethe light reactions alone.
16. 16When oxygen is released as a result of photosynthesis, it is a direct by-product of

    1. Areducing NADP+.
    2. Bsplitting water molecules.
    3. Cthe electron transfer system of photosystem II.
    4. Dchemiosmosis
    5. Ethe electron transfer system of photosystem I.
17. 17If the process of photosynthesis had never evolved on Earth, this planet would

    1. Ahave no land and be primarily ocean.
    2. Bhave no water and be dry land.
    3. Cbe very similar to the way it is today.
    4. Dhave no oxygen and thus no life.
    5. Eonly contain anaerobic organisms.
18. 18Which of the following statements best describes the relationship between photosynthesis and respiration?

    1. AATP molecules are produced in photosynthesis and used up in respiration.
    2. BRespiration runs the biochemical pathways of photosynthesis in reverse.
    3. CPhotosynthesis occurs only in plants and respiration occurs only in animals.
    4. DRespiration is anabolic and photosynthesis is catabolic.
    5. EPhotosynthesis stores energy in complex organic molecules, whereas respiration releases it.
19. 19What is the primary function of the Calvin cycle?

    1. Ause NADPH to release carbon dioxide
    2. Bsynthesize simple sugars from carbon dioxide
    3. Csplit water and release oxygen
    4. Duse ATP to release carbon dioxide
    5. Etransport RuBP out of the chloroplast
20. 20Three "turns" of the Calvin cycle generate a "surplus" molecule of glyceraldehyde 3-phosphate (G3P). Which of the following is a consequence of this?

    1. ASome plants would not taste sweet to us.
    2. BFormation of a molecule of glucose would require nine "turns."
    3. CPlants accumulate and store G3P.
    4. DG3P more readily forms sucrose and other disaccharides than it does monosaccharides.
    5. EThe formation of sucrose and starch in plants involves assembling G3P molecules, with or without further rearrangements.
21. 21If the carbon atom of the incoming CO2 molecule is labelled with a radioactive isotope of carbon, which organic molecules will be radioactively labelled after one cycle?

    

    1. AB and D only
    2. BC only
    3. CB, C, D, and E
    4. DC, D, and E only
    5. EB and C only
22. 22It is a particularly hot, dry summer. The town has banned excessive water use and so you cannot water your lawn. After a few weeks the grass has gone brown, except a few patches where the grass seems to be doing fine. You notice that this grass has a broader leaf and is not the same species as most of your lawn. You conclude that this grass is a

    1. AC4 plant.
    2. BC3 plant.
    3. Ca mutant.
    4. DC5 plant.
    5. ECAM plant.
23. 23Where is the Calvin cycle located in a C4 plant?

    1. Abundle sheath cells
    2. Bmesophyll cells
    3. Cstomata
    4. Dstems
    5. Ethe chloroplasts in leaves
24. 24In C3 photosynthesis, the reactions that require ATP take place in

    1. Athe light reactions alone.
    2. Bthe Calvin cycle alone.
    3. Cthe chloroplast, but are not part of photosynthesis.
    4. Dneither the light reactions nor the Calvin cycle.
    5. Eboth the light reactions and the Calvin cycle.
25. 25Where do the enzymatic reactions of the Calvin cycle take place?

    1. Athylakoid membranes
    2. Bmatrix of the mitochondria
    3. Cstroma of the chloroplast
    4. Dthylakoid space
    5. Ecytosol around the chloroplast
26. 26Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma. This damage will have the most direct effect on which of the following processes?

    1. Athe flow of electrons from photosystem II to photosystem I
    2. Bthe synthesis of ATP
    3. Cthe absorption of light energy by chlorophyll
    4. Dthe reduction of NADP+
    5. Ethe splitting of water
27. 27Reactions that require CO2 take place in

    1. Athe Calvin cycle alone.
    2. Bthe light reactions alone.
    3. Cboth the light reactions and the Calvin cycle.
    4. Dthe chloroplast, but are not part of photosynthesis.
    5. Eneither the light reactions nor the Calvin cycle.
28. 28Plants photosynthesize only in the light. Plants respire

    1. Aonly when excessive light energy induces photorespiration.
    2. Bin the light only.
    3. Cnever–they get their ATP from photophosphorylation.
    4. Din the dark only.
    5. Eboth in light and dark.
29. 29If atmospheric CO2 concentrations increase twofold or more, how will plants be affected, disregarding any changes in climate?

    1. AC4 plants will have faster growth; C3 plants will be minimally affected.
    2. BC3 plants will have faster growth; C4 plants will be minimally affected.
    3. CPlant growth will not be affected because atmospheric CO2 concentrations are never limiting for plant growth.
    4. DC3 plants will have faster growth; C4 plants will have slower growth.
    5. EAll plants will experience increased rates of photosynthesis.

Descripción

Biology Test sobre Lesson 2, creado por Emmy Guye el 05/04/2023.

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Emmy Guye

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