A Biochemist Studying the Breakdown in Soil of the Insecticide

question 3

Multiple Choice

A biochemist studying the breakdown in soil of the insecticide DDT finds that it decays by a first order reaction with a rate constant, k , of 0.0578 yr ^{- 1}. How long does it take DDT to decay from 295 ppbm tO₅ 0.0 ppbm?

• A) 0.103 years
• B) 0.287 years
• C) 11.9 years
• D) 13.3 years
• E) 30.7 years

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Definitions:

Sterile Dressing

An application of a sterile covering over a wound to promote healing and prevent infection.

Epidermis

The outermost layer of the skin, serving as a protective barrier against environmental damage.

Dermis

True skin.

Subcutaneous

Beneath the skin.