Data Suggest That Rubisco Ribulose- 1,5- Bisphosphate Carboxylase) Makes Up

question 25

Multiple Choice

Data suggest that rubisco ribulose- 1,5- bisphosphate carboxylase) makes up 10% of the total protein found in spinach leaves. Research elucidating the structure of rubisco shows that it has four active sites. Why, with four active sites, might there be such a large concentration of rubisco in plant matter?

• A) Rubisco is a very slow enzyme; what it lacks in speed, it makes up in numbers.
• B) Rubisco catalyzes four of the six reactions found in the Calvin cycle.
• C) Three of the four active sites bind carbon dioxide; only one binds ribulose- 1,5- bisphosphate.
• D) All heterotrophic organisms depend on plants, either directly or indirectly, for their food supply.

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Definitions:

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