When Certain Molecules Are Pumped Across Biological Membranes Against a Concentration

question 1

Multiple Choice

When certain molecules are pumped across biological membranes against a concentration gradient via active transport, ATP is used. In the cells of our bodies, for example, sugars are actively transported and metabolized within the membrane- enclosed mitochondria. Prokaryotes, in contrast, lack mitochondria but are nonetheless ab metabolize the same sugars. Based on the details provided in this scenario, which of the following statements is expected to be TRUE?

• A) The sugar- digesting enzymes in eukaryotic cells, such as sucrase, are not the same sugar- digesting enzymes found in prokaryotic cells.
• B) Sugar metabolism in prokaryotes is exergonic, whereas in eukaryotes it is endergonic.
• C) Prokaryotes and eukaryotes should have the same metabolic efficiency when digesting the same sugars, assuming their enzymes are the same.
• D) Overall, prokaryotes will gain more ATP per sugar molecule metabolized than will eukaryotes.

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Definitions:

Overhead Applied

The portion of overhead costs assigned to the production of goods or services.

Raw Materials Issued

The allocation or distribution of raw materials for use in the production process.

Labor Time Tickets

Paper or electronic forms used to track the amount of time a worker spends on a particular job or project, utilized for cost accounting and payroll purposes.

Factory Overhead

The total of all indirect costs associated with manufacturing, including utilities, rent for the manufacturing facilities, and maintenance.