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3 Apr 2018

Build a model with boxes and arrows(words above the arrows) that describes how crassulacean acid metabolism (CAM) plants minimize photorespiration.

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27 Aug 2023

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Related questions

15. The most important contribution of the citric acid cycle to energy metabolism is the extraction of high-energy electrons during the oxidation of acetyl CoA to CO2.

a. True

b. False

16. Each respiratory enzyme complex in the electron-transport chain has a greater affinity for electrons than its predecessors, so that electrons pass sequentially from one complex to another until they are finally transferred to oxygen, which has the greatest electron affinity.

a. True

b. False

17. The degradation and recycling of biological macromolecules occurs in the

a. Proteasome

b. Endoplasmic reticulum

c. Nucleus

d. Lysosome

e. Both a and d.

21. Which of the following is not true of the enzyme ribulose bis-phosphate carboxylase (RUBISCO):

a. It is responsible for photorespiration when O2 rather than CO2 is added to ribulose bis-phosphate

b. It is found in the stroma of the chloroplast

c. It “fixes” CO2 to phosphoenolpyruvate to make oxaloacetate.

d. It is the most abundant protein on earth

22. Why do C4 plants have an elegant shuttle to increase CO2 concentrations near RUBISCO?

a. To maximize photorespiration (when plants take up O2 instead of CO2)

b. To minimize photorespiration (when plants take up O2 instead of CO2)

c. To maximize photophosphorylation (cyclic electron flow used to make ATP)

d. To minimize photophosphorylation (cyclic electron flow used to make ATP)

5: chloroplast kept in the dark can continue to make sugar is provided with

A: NADPH, CO2, and ADP

B: CO2, and ATP

C: NADPH, ATP, and CO2

D: NADPH and ATP

E: water and ATP

7: C3 plants are more susceptible to photorespiration than either C4 or CAM plants. Why do most plants lack the C4 pathway??

A: Switching between C3, C4, and CAM photosynthesis is very difficult for most plants

B: ?Rubisco is more efficient in C3 plants when compared to rubisco of C4 and CAM plants

C: Most plant species do not have vacuoles in their cells to store the malate generated from CO2 taken in during the night.

D; : Photorespiration is not a serious problem for most plants.?

E: There is an energetic cost to C4 and CAM pathways that only makes them advantageous in very hot and/or arid environments.?



8: In Engelmann's classic experiment, why were the oxygen-requiring bacteria clustered around the regions of Spirogyra algae that were bathed in red, blue, and violet light?

A; The bacteria were immobile and that is where Engelmann happened to place them

.?B; The most energy-rich wavelengths of light are found at the edges of visible and nonvisible light (ultra

violet and infrared)

C; Photosynthesis is most active in those wavelengths of light and thus more oxygen is consumed by the algae in those regions.

D: Photosynthesis is most active in those wavelengths of light and thus more oxygen is produced by the algae in those regions.?

E: : Chlorophyll is green and thus reflects green light.

9: In any experiment, changes to the dependent variable based on the manipulations of the independent variable are measured. When determining the action spectrum of a given plant, what is the independent variable and what is the dependent variable?

A: independent = rate of O2 release in photosynthesis; dependent = wavelength?

B: ?independent = absorption of light; dependent = wavelength

C: independent = wavelength; dependent = rate of O2 release in photosynthesis?

D: independent = wavelength; dependent = absorption of light?

E: independent = rate of O2 release in photosynthesis; dependent = absorption of light

11: In order to elucidate the Calvin cycle, Calvin and his colleagues used two-dimensional paper chromatography to analyze the presence of different molecules under different conditions. What did they conclude from the accumulation of RuBP when CO2 levels were low??

A: CO2 serves as a non-competitive inhibitor of rubisco.

B: RuBP is the last substrate to react in the Calvin cycle.

C: RuBP only reacts with CO2 when concentrations of ATP are low

D: RuBP is the first substrate to react with CO2

E: RuBP only reacts with CO2 in the sunlight


12: Why isn't oxygen produced by organisms that perform anoxygenic photosynthesis?

A; their membranes lack ATP synthase?

B; They use a different enzyme for the initial reactions of the calvin cycle

C: they use electrons donors other than water

D: their photosystem do not utilize the calvin cycle

E: their chorophyll contains an iron rather than magnesium

Explain your answers, please.

Fire is a common occurrence in prairie grasslands. What do you think would happen to a grassland area if fire were excluded for many decades?

A. some trees would slowly begin to appear.
B. there would be no change.
C. it would become a desert.

D. it would slowly turn into a tropical rainforest

If you examine plant life in a very arid place like deathvalley, you may find some herbaceous desert plants that do not have any anatomical features for water conservation. How would you expect this as someone who has studied botany?

A. they absorb moisture from the atmosphere during night
B. they can grow with very little available water.
C. they can exist and grow for long periods on stored water.
D. they complete life cycle within the short time there is sufficient moisture.

E. they use crassulacean acid metabolism pathway

Which of the following is a difference between a prairie grassland and a savanna grassland?

A. Prairie soils are rich in nutrients
B. Savannas have provided some of the most productive agricultural lands.
C. Prairies support an immense population of animals.
D. Savannas have scattered tall trees

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