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:

Herfindahl-Hirschman Index

An index used to assess the concentration of market power to determine the degree of competition in a sector.

Squared Market Shares

A measure used in economics to assess the level of market concentration by squaring the market share percentages of each firm within the industry and then summing them.

Concentration

The degree of market power held by a few companies within an industry, often measured using indices like the HHI.

Economies of Scale

The reduction in per-unit cost as the volume of production increases, due to factors like specialization and bulk purchasing.