The Purpose of the "Chopper" Device in Conventional Infrared Analyzers

question 13

Multiple Choice

The purpose of the "chopper" device in conventional infrared analyzers is to:

• A) Interrupt the flow of gas through the connective tubing.
• B) Create a vacuum to allow gas to be ionized.
• C) Alternate the radiation reaching the reference and detector cells.
• D) Protect the infrared detector from excessive exposure.

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Definitions:

Bacteriophage

Type of virus that infects bacteria.

Emerging Disease

An emerging disease is a disease that has appeared in a population for the first time, or that may have existed previously but is rapidly increasing in incidence or geographic range.

Vector

In biotechnology, a plasmid or other DNA molecule that can accept foreign DNA and be replicated inside a host cell. In epidemiology, an animal that carries a pathogen from one host to another.

Reverse Transcriptase

An enzyme that catalyzes the formation of DNA from an RNA template, crucial for the replication of retroviruses.