The Lac Operon

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

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

1965

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

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

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

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

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

<p>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.</p> Signup and view all the answers

<p>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.</p> Signup and view all the answers