Some of Your DNA May Not Code for Any Protein

question 62

Multiple Choice

Some of your DNA may not code for any protein and has no known function in gene regulation; it is sometimes referred to as "junk" DNA. How do nucleotide sequences of "junk DNA" evolve?

• A)They evolve through natural selection.
• B)They evolve through genetic drift and other chance processes.
• C)They evolve to be more useful by taking on new functions.
• D)They evolve by gradually being eliminated from the gene pool.

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Definitions:

Fixed Costs

Costs that do not vary with the level of production or sales within a certain range, such as rent, salaries, and insurance.

Variable Cost

A cost that varies with the level of output or activity, such as materials and labor costs.

Operating Leverage

A financial ratio that measures the degree to which a firm or project can increase operating income by increasing revenue.

Operating Income

The income earned from a company's day-to-day operations, calculated before taking into account interest and taxes.