A 4-L Sample of Water Contains 80 µG of Lead

question 78

Multiple Choice

A 4-L sample of water contains 80 µg of lead.What is this lead concentration,in parts per billion (ppb) ?

• A)20
• B)80
• C)320
• D)500

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Definitions:

Nucleus

Cell organelle containing most of the genetic material of the cell; collection of nerve cell bodies within the central nervous system; center of an atom consisting of protons and neutrons. Plural: Nuclei.

Chromosomes

The structures within cells that hold genes, made up of DNA and protein, and are key to the process of heredity and determining traits.

Organelle

Specialized part of a cell with one or more specific individual functions.

Control Center

In physiology, a system that manages the function of maintaining homeostasis in the body by receiving and processing signals.