Section 6-2 Review: The Calvin Cycle

CAM

A carbon fixation pathway in which carbon dioxide is incorporated into organic compounds at night and release the Calvin Cycle during day

STRUCTURES AND FUNCTIONS

ADP: 3 ATP: 3 PGAL: NADP+ : 6 NADPH: 6 ADP: 6 ATP: 6 PGA: CO2: 3 RuBP: 3

The stomata would open. This will allow more carbon dioxide to enter the leaf from the surrounding air, stimulating photosynthesis.

CRITICAL THINKING: Stomata can open and close in response to changes in the carbon dioxide concentration inside the leaf. Would you except stomata to open and close if the carbon dioxide concentration decreased.

CAM plants open their stomata at night, whereas C3 and C4 plants open their stomata during the day.

How do CAM plants driver from both C3 and C4 plants?

In each turn of the cycle, there are three molecules of ATP and two molecules of NADPH are used.

How many molecules of ATP and NADPH are used in each turn of the Calvin Cycle?

For every three molecules of carbon dioxide that enter the Calvin Cycle, the cycle produces one molecule of........ a). RuBP b). PGA c). PGAL d). NADPH

c). PGAL

As light intensity increases, the rate of photosynthesis......... a). continues to decrease b). continues to increase c). initially decreases and then levels off d).

d).

Calvin Cycle

- A biochemical pathway that produces a three-carbon sugar from carbon dioxide during phtosynthesis

C4 Pathway

- A carbon fixation pathway where carbon dioxide is incorporated into organic compounds into four-carbon compounds.

Stroma

- A small pore on the surface of a plant through which water, carbon dioxide and other gases enter and leave the plant

Carbon Fixation

- The incorporation of carbon dioxide during photosynthesis

CO2 + H2O ➡️️ (CH2O + O2)

Using (CH2O) as the general formula for a carbohydrate, write the simplest overall equation for photosynthesis.

Increasing the temperature accelerates the various chemical reactions involved in photosynthesis. At high temperatures the enzymes that catalyze these reaction became ineffective and the stomata began to close.

Why does the rate of photosynthesis increase, peak, and then decreases as temperature increases?

The Calvin Cycle begins when carbon dioxide combines with a five-carbon carbohydrate called...... a). RuBP b). PGA c). PGAL d). NADPH

a). RuBP

C3 and C4 plants differ in terms of the number of........... a). steps in the Calvin Cycle b). carbon atoms in the compound that carbon dioxide is initially incorporated into c). carbon atoms in the end product of the Calvin Cycle d). ATP molecules used in the Calvin Cycle

b). carbon atoms in the compound that carbon dioxide is initially incorporated into

Organic compounds that can be made from the products of the Calvin Cycle include........ a). only carbohydrates b). only amino acids c). only lipids d). carbohydrates, amino acids, and lipids

d). carbohydrates, amino acids, and lipids