Why Do Biologists Believe Glycolysis Evolved Before the Krebs Cycle

question 45

Multiple Choice

Why do biologists believe glycolysis evolved before the Krebs cycle and the electron transport chain?

• A)Glycolysis occurs in the mitochondria, which all organisms have.
• B)Glycolysis requires oxygen, which was one of the first elements on Earth.
• C)All organisms use glycolysis; not all use the Krebs cycle and the electron transport chain.
• D)Glycolysis is the most efficient at producing energy.

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Definitions:

Aggregate Expenditure Line

A graphical representation of the total planned spending in an economy at various levels of national income.

Price Level

A measure that reflects the average prices of goods and services in an economy at a specific point in time.

Marginal Propensity

The tendency of an individual or household to spend an additional dollar of income on consuming goods and services.

Simple Spending Multiplier

The ratio of a change in output to a change in autonomous spending that caused it, illustrating the impact of fiscal policy on total economic output.