Which of the Following Is Accurate About Polychlorinated Biphenyls (PCBs)

question 49

Multiple Choice

Which of the following is accurate about polychlorinated biphenyls (PCBs) ?

• A) PCBs are naturally generated through biological interactions, but also synthesized industrially.
• B) PCBs greatly affect the biomass of plants, which rely on nitrogen fixation.
• C) PCBs accumulate in river systems via agricultural run-off.
• D) PCBs, such as DDT, are beneficial in their role of saving human lives.

---

Definitions:

Immune Response

The body's defense mechanism against pathogens, involving both specific and non-specific components.

Mucous Membranes

The moist linings of various body cavities, including the nose, mouth, lungs, and digestive tract, that secrete mucus.

Indirect Contact

A method of disease transmission where an infectious agent is transferred from one individual to another through a secondary object or person.

Pathogen

An agent, particularly a microorganism, that causes disease in its host.