Exam 10: Photosynthesis: Energy From Sunlight

Not all the carbon atoms in the RuBP that enters photorespiration are given off in the form of carbon dioxide.Some of these carbon atoms are able to enter the Calvin cycle in which form?

In both photosynthesis and respiration, protons are pumped across a membrane during

When C₄ and _______ plants are exposed to light and CO₂, a four-carbon compound (oxaloacetate) is the first carbon-containing product of carbon fixation.

Does photosynthesis always produce oxygen?

Refer to the table below. The table summarizes characteristics of two metabolic reactions occurring in the chloroplast.The question mark in the table can be replaced with the word _______.

Which statement about ribulose bisphosphate carboxylase/oxygenase (rubisco) is false?

In C₃ plants the Calvin cycle occurs in the chloroplasts of mesophyll cells, whereas in C₄ plants the Calvin cycle occurs in the _______ cells.

A student was asked to describe the Calvin cycle in a chloroplast.He began by talking about the carbon-fixation reaction catalyzed by rubisco between carbon dioxide and ribulose 1,5-bisphosphate (RuBP) that produces 3-phosphoglycerate (3PG).The student finished by describing reactions involving ATP and NADPH that convert 3-phosphoglycerate to glyceraldehyde 3-phosphate (G3P), which can be used to produce sucrose and other sugars in the cytoplasm.The student neglected to describe the third process of the Calvin cycle, which involves _______.

What would happen to photosynthesis if a plant were only exposed to light with wavelengths 525-575 nm?

Photosystem II

It has been estimated that only about 5 percent of the sun's energy that reaches Earth is captured as chemical energy in the form of carbohydrates via photosynthesis.How much of the sun's energy reaching Earth do you estimate is stored in the cells of nonphotosynthetic organisms?

In C₄ plants, the four-carbon compound that is synthesized by carbon fixation in the mesophyll cells

Refer to the table below, which summarizes conditions used in four experiments in which isotopes were used to trace the fate of oxygen atoms during photosynthesis by a terrestrial green plant species. Which set of experiments would provide the best data for determining the source of O₂ produced by the plants?

Photosynthesis takes place in plants only in the light.Respiration takes place

Wheat, roses, and rice are examples of

In sunny, hot weather, corn, which is a C₄ plant, has a survival advantage over wheat, which is a C₃ plant, because

At hourly intervals, researchers measured the change in growth rate of a cactus, a CAM plant, over a 5-day period.The results were used to prepare the graph below.The shaded areas denote dark periods, while white areas denote daylight periods. Which statement reasonably explains the pattern in the growth rate revealed in this graph? Remember to apply what you know about CAM plants and cells in general as you consider the various statement options.

Refer to the figure below. This photosystem produces ATP but not NADPH.Explain why the cyclic nature of this system makes it impossible for NADPH to be formed, and why the noncyclic system is able to form NADPH.

Plant cellular respiration occurs

Refer to the diagram below showing the 1941 experiments of Samuel Ruben and Martin Kamen that traced isotopes of oxygen through the process of photosynthesis. The Ruben and Kamen experiments demonstrated that