Why Do Mitochondria and Chloroplasts Have Small Genomes

question 52

Multiple Choice

Why do mitochondria and chloroplasts have small genomes?

• A)Because their bacterial ancestors did.
• B)Because they do not need many genes to function.
• C)Because they lack noncoding DNA.
• D)Because over time, much of their DNA has migrated to the host cell nucleus.

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Definitions:

Marginal Cost (MC)

The extra (additional) cost of producing 1 more unit of output; equal to the change in total cost divided by the change in output (and, in the short run, to the change in total variable cost divided by the change in output).

Total Cost

The sum of all costs incurred by a business in the production of goods or services, including both fixed and variable costs.

Marginal Cost

The additional cost incurred from producing one more unit of a good or service.

Average Total Cost

A firm’s total cost divided by output (the quantity of product produced); equal to average fixed cost plus average variable cost.