Answer:
A promoter refers to a DNA sequence, that is, situated upstream of a gene and signals the start of transcription.
A repressor refers to a transcription factor that prevents transcription by combining with the operator site.
An insulator refers to an element that obstructs the signals between the promoters and enhancer.
A regulatory gene refers to a gene, which monitors the expression of one or more genes by preventing or encouraging transcription.
An inducer refers to a molecule that stimulates the synthesis of mRNA by disabling the protein, which inhibits the transcription.
An operator refers to a short sequence of DNA situated close to the promoter region, and is recognized by a repressor protein.
Answer:
Animal cells can only use nitrogen when it's combined with other elements.
Explanation:
Brainliest?
Energy sources are classified as nonrenewable because they do not form or replenish in a short period of time. Renewable energy sources such as solar and wind replenish naturally in a short period of time.
The four major nonrenewable energy sources are
<span>- Crude oil
- Natural gas
- Coal
- Uranium (nuclear energy) </span>
Nonrenewable energy sources come out of the ground as liquids, gases, and solids. We use crude oil to make liquid petroleum products such as gasoline, diesel fuel, and heating oil. Propane and other hydrocarbon gas liquids, such as butane and ethane, are found in natural gas and crude oil.
All fossil fuels are nonrenewable, but not all nonrenewable energy sources are fossil fuels
Coal, crude oil, and natural gas are all considered fossil fuels because they were formed from the buried remains of plants and animals that lived millions of years ago.
Uranium ore, a solid, is mined and converted to a fuel used at nuclear power plants. Uranium is not a fossil fuel, but it is classified as a nonrenewable fuel.
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