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.

A botanist brings you a plant that she has collected during her travels and asks you to determine the photosynthetic pathway the plant uses. You grow the plant in a special chamber on a 14:10-hour light/dark cycle and track the fate of radiolabeled CO2 in the plant over 24 hours. You begin monitoring the plant's photosynthetic activity at the beginning of the light portion of the cycle. You find that during the day, the plant's stomata remain closed, and an enzyme with a low affinity for CO2 slowly catalyzes the joining of CO2 and a five-carbon molecule in the plant's mesophyll cells. Once the chamber switches to the night cycle, the plant stomata open, and an enzyme with a high affinity for CO2 slowly catalyzes the joining of CO2 to a three-carbon molecule to produce a four-carbon molecule in the mesophyll cells. What photosynthetic pathway(s) does this plant use? Group of answer choices C4 Photorespiration CAM C3

In C3 plants CO2 is first incorporated into __________, whereas in C4 and CAM plants the CO2 is first incorporated into __________, and subsequently put into the Calvin cycle by Rubisco. a. 3-phosphoglycerate; oxaloacetate b. dihydroxyacetone phosphate; malate c. 3-phosphoglycerate; malate d. glyceraldehyde-3- phosphate; erythrose-4-phosphate

Determine the order of the steps in photosynthesis and how they are interconnected. a. Light-Dependent Reactionsb. Calvin Cycle (Light-Independent Reactions)

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.

A mutant form of an Arabidopsis thaliana plant has defective chlorophyll production, such that the abundance of chlorophyll molecules in chloroplasts is 5% the normal level, and the chlorophyll molecules are on average too far apart for resonance energy transfer to occur. What will be the effect on the overall efficiency of photosynthesis in the plant? Rationalize your answer

Which of the following is true of light-independent reactions of photosynthesis? Select all that apply. a. Light-independent reactions occur in the stroma. b. Water molecules are split during light-independent reactions. c. Chlorophyll absorbs energy from sunlight. d. Carbon dioxide is necessary for light-independent reactions.

The investigator suggested that insufficient amounts of carbon dioxide in the water may have been one of the factors that prevented further increases in the rate of photosynthesis at higher light intensities. Why would inadequate amounts of carbon dioxide affect the rate of photosynthesis? Select one or more: a. Carbon dioxide is needed for the production of sugars in the light reactions of photosynthesis b. Carbon dioxide is needed for the production of sugars in the Calvin Cycle of photosynthesis c. Carbon dioxide is needed for the production of ATP in the Calvin Cycle d. Carbon dioxide is the source of oxygen in photosynthesis e. Carbon dioxide is needed for the production of ATP in the light reactions of photosynthesis

Which of the following are products of the dark (light independent, Calvin cycle) reactions of photosynthesis.  A. Glucose  B. Water C. ATP D. NADP E. Light energy  F. NADPH G. Carbon dioxide  H. Oxygen

What is the difference between the cyclic and noncyclic pathways of photosynthesis? a The cyclic pathway uses electron transport. b The cyclic pathway is light-dependent. c The noncyclic pathway produces NAPDH. d The noncyclic pathway produces ATP.