The Lac Operon

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Questions and Answers

What is the function of the lac operon in E. coli and other enteric bacteria?

The lac operon is required for the transport and metabolism of lactose when glucose is not available.

What did François Jacob and Jacques Monod use the lactose metabolism system for?

They used it to determine how a biological cell knows which enzyme to synthesize.

In what year did François Jacob and Jacques Monod win the Nobel Prize in Physiology for their work on the lac operon?

1965

What is unique about the gene regulation in bacterial cells like E. coli?

Bacterial cells lack introns in their genome and a nuclear membrane, so gene regulation occurs at the transcriptional level. Signup and view all the answers

Why is the lac operon considered a foremost example of prokaryotic gene regulation?

It was the first genetic regulatory mechanism to be clearly understood. Signup and view all the answers

What is plant breeding?

Plant breeding is the science of changing the traits of plants in order to produce desired characteristics. Signup and view all the answers

How has plant breeding been used to improve products for humans and animals?

It has been used to improve the quality of nutrition in products for humans and animals. Signup and view all the answers

What are the goals of plant breeding?

The goals of plant breeding are to produce crop varieties that boast unique and superior traits for a variety of applications. Signup and view all the answers

What are some frequently addressed agricultural traits in plant breeding?

The most frequently addressed agricultural traits are those related to biotic and abiotic stress tolerance, grain or biomass yield, end-use quality characteristics such as taste or the concentrations of specific biological molecules, and ease of processing. Signup and view all the answers

What techniques can be used in plant breeding?

Plant breeding can be performed through many different techniques ranging from simply selecting plants with desirable characteristics for propagation, to methods that make use of knowledge of genetics and chromosomes, to more complex molecular techniques. Signup and view all the answers

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