Which of the following statements about the Calvin-Benson cycle is TRUE? Select one: a. Blocking light causes 3PG to accumulate. b. All the statements are false. c. Rubisco catalyzes the formation of RuBP. d. ATP and NADPH + H+ are required to regenerate RuBP. e. More molecules of NADPH than ATP are required per cycle.

Which of the following statements about the Calvin-Benson cycle is TRUE? Select one: a. Blocking light causes 3PG to accumulate. b. All the statements are false. c. Rubisco catalyzes the formation of RuBP. d. ATP and NADPH + H+ are required to regenerate RuBP. e. More molecules of NADPH than ATP are required per cycle.

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter6: Where It Starts-photosynthesis

Section: Chapter Questions

Problem 12SA: Which of the following substances does not participate in the Calvin-Benson cycle? a. ATP c. NADPH...

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Which of the following substances does not participate in the Calvin-Benson cycle? a. ATP c. NADPH e. PGAL b. O2 d. RuBP f. CO2
Which of the following descriptions about photorespiration is not correct? Select one: a. Rubisco binds O2 instead of CO2. b. Carbon dioxide is released without producing ATP. c. It limits damaging products of light reactions that build up in the absence of the Calvin cycle at low CO2 concentrations. d. Peroxisomes and mitochondria rearrange and split the compound made by rubisco to fix CO2. e. It occurs in hot and dry conditions.
If 30 molecules of CO2 enter the Calvin Cycle,a. How many molecules of phosphoglycerate (PGA) will be produced? b. How many molecules of glyceraldehyde phosphate (PGAL) leave the cycle? c. How many molecules of ribulose bisphosphate (RuBP) will be produced? d. How many molecules of ATP will be utilized?
Which of the following statements is TRUE? Select one: a. The immediate product of the light energy absorbed by the P680 reaction center is used to produce NADPH. b. In cyclic photophosphorylation, the chlorophyll is reduced by electrons liberated from water molecules. c. The O2 gas produced during photosynthesis is derived from CO2. d. In noncyclic photophosphorylation, electrons from water are used directly for the reduction of P700. e. All of the statements are false.
Explain briefly why the following ideas are false. a. Photosynthesis is the food-making process done by plants. b The Calvin cycle was called the dark reactions because it can only take place in the absence of light. c. Photosynthesis can only be powered by sunlight.
You have discovered a novel peptide that, when administered to plant cells, spontaneously inserts into the thylakoid membranes and forms a channel that lets protons cross the membrane. You treat plant cells growing normally with your peptide. Which of the following statements correctly describes the effect on photosynthesis shortly after the addition of the peptide? Select all that are true. a. The rate of Glyceraldehyde 3-phosphate synthesis will decrease b. The rate of oxygen production will be unaffected c. The rate of Glyceraldehyde 3-phosphate synthesis will increase d. The rate of oxygen production will decrease e. The rate of oxygen production will increase f. The rate of Glyceraldehyde 3-phosphate synthesis will be unaffected
RuBisCo is mutated so that it does not function. What would be a possible impact on the Calvin cycle? which options are true a. Less CO2 would be produced. b. Oxidation of NADPH would be decreased. c. G3P production would decrease. d. CO2 would be fixed at an increased rate. e. RuBP would be regenerated at a faster rate.
The end product(s) of the light independent reactions (Calvin cycle) of photosynthesis is glyceraldehyde-3-phosphate. Where (if any) can this product enter into catabolic metabolism to make ATP for the cell? Select one: a. the Kreb’s cycle since the end product is pyruvate b. the energy investment stage (step 1) of glycolysis c. the energy payoff stage of glycolysis d. oxidative phosphorylation since the end product(s) are ATP and NADH
Although the Calvin cycle does not depend on light, it generally does not occur during night. What is the reason for this? Select one: a. The Calvin cycle cannot proceed because the products of light reaction are insufficient. b. Enzymes do not function normally due to the low temperature. c. Carbon cannot be fixed because of the low concentration of carbon dioxide. d. Energy is not provided because the electron transport chain is used for respiration. e. Carbon dioxide is not available because the stomata is closed.
Which of the following is true of chloroplastic ATP: Select one: a. it is made in the Calvin cycle and consumed in the light reactions b. it is used during photosynthesis, S assimilation, and N assimilation c. it does not leave the chloroplast, and is used to breakdown molecules d. it is made during photosynthesis and S assimilation e. it leaves the chloroplast, and is consumed in respiration and N assimilation
Which of the following is an incorrect statement about the Calvin cycle? A.The main inputs to the reactions are NADPH, ATP, and CO2. B.The main outputs of the reactions are NADP+ , ADP, and sugar. C.More NADPH is used than ATP during the Calvin cycle. D.Carbon fixation is the first step of the process
The ultimate source of energy in our planet is sunlight. In the first stage of photosynthesis, light energy is captured in chlorophyll-containing reaction centers (PSII and PSI). What is the first step in the capture of light energy at PSII? a. The energy carriers ATP and NADPH + H+ are synthesized. b. CO2 reacts with the C5 sugar ribulose-1,5-bis-phosphate in the first step of the Calvin cycle. c. Starch is synthesized. d. H2O is photolyzed and its electrons are captured by special chlorophyll molecules. e. Sucrose is synthesized from glucose and fructose.