HIV-1 Protease Is Different from Most Mammalian Aspartic Acid Proteases

question 24

Multiple Choice

HIV-1 protease is different from most mammalian aspartic acid proteases in that it has:

• A) two subunits each with a two-aspartate active site.
• B) two subunits each contributing an aspartate to the active site.
• C) two active sites on one protein.
• D) two subunits, one with an active site, and the other with a regulatory activity.
• E) none of the above.

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Definitions:

Stratosphere

The layer of the Earth's atmosphere just above the troposphere, known for its ozone layer which absorbs and scatters harmful ultraviolet sunlight.

CFCs

Chlorofluorocarbons, man-made chemical compounds once commonly used in refrigeration and aerosols, known to deplete the ozone layer.

Years

Units of time based on the period Earth takes to orbit around the Sun, approximately 365 or 366 days.