The Hypothesis for the Origin of Eukaryotes Through Serial Endosymbiosis

question 82

Multiple Choice

The hypothesis for the origin of eukaryotes through serial endosymbiosis proposes that

• A)the ancestors of mitochondria were aerobic heterotrophic prokaryotes, while the ancestors of plastids were photosynthetic prokaryotes.
• B)mitochondria and plastids replicate in a manner similar to eukaryotes.
• C)genes in mitochondria and plastids are similar to genes of ancient eukaryotes.
• D)eukaryotes likely evolved from the fusion of small prokaryotic and small eukaryotic cells.

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Definitions:

Explicit Costs

These are direct monetary payments a firm makes to purchase inputs for its production, such as wages, rent, and materials.

Implicit Costs

The opportunity costs of using resources already owned by the firm for production, as opposed to external spending.

Economic Profit

The difference between revenue generated from output and the opportunity costs of inputs used, considering both explicit and implicit costs.

Accounting Profit

The profit of a company after all expenses have been deducted from revenues, but before deducting income taxes.