Proton Pumps Are Used in Various Ways by Members of Every

question 33

Multiple Choice

Proton pumps are used in various ways by members of every kingdom of organisms. What does this most probably mean?

• A)Proton pumps must have evolved before any living organisms were present on the earth.
• B)Proton pumps are fundamental to all cell types.
• C)The high concentration of protons in the ancient atmosphere must have necessitated a pump mechanism.
• D)Cells with proton pumps were maintained in each Kingdom by natural selection.
• E)Proton pumps are necessary to all cell membranes.

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Definitions:

Administrative Expense

Costs related to the general operation and administration of a business, including salaries of executive staff, office supplies, and utilities, but not directly tied to production or sales.

Promissory Note

A financial instrument in which one party promises in writing to pay a determinate sum of money to the other, either at a fixed or determinable future time or on demand.

Maturity Date

The date on which a financial obligation is due to be paid, such as the final payment date of a loan or bond.

Credit Sale

A sales transaction in which the amount due is not paid at the time of sale but is promised to be paid in the future by the purchaser.