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elixir [45]
3 years ago
15

In the absence of glucose and the presence of lactose, where is the lac repressor bound?

Biology
1 answer:
astraxan [27]3 years ago
4 0

Answer:

The lac repressor is not bound to the operon.

Explanation:

The lac repressor is a protein encoded by the lac I gene. In absence of lactose, the lac repressor binds to the operator sequence of the lac operon and does not allow the RNA polymerase to express the operon. However, as lactose enters the cell from the medium, the beta-galactosidase enzyme converts it into allolactose which in turn serves as an inducer of the lac operon. Binding of allolactose to lac repressor trigger conformational changes in the protein and renders it unable to bind to the operator. The RNA polymerase is allowed to express the operon.

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Which statement best explains the state of the water cycle on this newly discovered planet?

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B. The water is trapped as water vapor in the atmosphere and clouds.

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D. Water is frozen underground instead of flowing on the surface.

Complete answer:

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The water cycle can be broken down into three parts, as follows:

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Evaporation: When the sun's heat drives water from oceans, lakes, streams, ice, and soils to rise into the air and transform into water vapour, this is known as evaporation (gas). Clouds form when water vapour droplets combine.

According to the first statement, water may be collected in lakes or oceans, or frozen in snow and ice. Evaporation occurs when water is collected in lakes or seas and exposed to high enough surface temperatures. Also, if water is frozen or in snow, the rate of evaporation will be significantly reduced, although it may still occur provided individual molecules carry sufficient heat. This statement provides some explanations for why we may not see evaporation, but it is not the best available to describe the water cycle on this planet.

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Answer:

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Explanation:

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