To selectively grow a bacterium that lives in the ocean, you would need to create a medium that mimics the conditions of the ocean. Here are the steps:

1. **Prepare the Base**: Start with a base of agar, a gelatinous substance derived from seaweed. Agar is commonly used in labs to grow bacteria because it's a good nutrient source and has a suitable texture for bacterial growth.

2. **Add Salt**: Since ocean water is salty, you would need to add salt to your medium. The average salinity of sea water is about 3.5%, so you would need to add 35 grams of salt for every liter of water.

3. **Add Other Nutrients**: Bacteria need more than just salt to grow. They also need sources of carbon and nitrogen, as well as certain vitamins and minerals. You can buy pre-made mixtures of these nutrients, or you can make your own. For example, you might add peptone (a mixture of amino acids) and yeast extract.

4. **Sterilize the Medium**: Before you can use your medium, you need to sterilize it to kill any unwanted bacteria or other organisms. This is usually done by autoclaving, which involves heating the medium to a high temperature (about 121 degrees Celsius) for a certain amount of time (usually about 15 minutes).

5. **Inoculate the Medium**: Once the medium is cool, you can add your ocean bacteria. This is usually done by streaking a small amount of the bacteria onto the surface of the agar.

6. **Incubate the Bacteria**: Finally, you would need to incubate the bacteria at a suitable temperature. The exact temperature would depend on the species of bacteria, but many marine bacteria grow best at temperatures around 15-20 degrees Celsius.

Remember, this is a general guide. The exact composition of your medium might need to be adjusted depending on the specific needs of the bacteria you're trying to grow.

Question

To selectively grow a bacterium that lives in the ocean, you would need to create a medium that mimics the conditions of the ocean. Here are the steps:

1. **Prepare the Base**: Start with a base of agar, a gelatinous substance derived from seaweed. Agar is commonly used in labs to grow bacteria because it's a good nutrient source and has a suitable texture for bacterial growth.

2. **Add Salt**: Since ocean water is salty, you would need to add salt to your medium. The average salinity of sea water is about 3.5%, so you would need to add 35 grams of salt for every liter of water.

3. **Add Other Nutrients**: Bacteria need more than just salt to grow. They also need sources of carbon and nitrogen, as well as certain vitamins and minerals. You can buy pre-made mixtures of these nutrients, or you can make your own. For example, you might add peptone (a mixture of amino acids) and yeast extract.

4. **Sterilize the Medium**: Before you can use your medium, you need to sterilize it to kill any unwanted bacteria or other organisms. This is usually done by autoclaving, which involves heating the medium to a high temperature (about 121 degrees Celsius) for a certain amount of time (usually about 15 minutes).

5. **Inoculate the Medium**: Once the medium is cool, you can add your ocean bacteria. This is usually done by streaking a small amount of the bacteria onto the surface of the agar.

6. **Incubate the Bacteria**: Finally, you would need to incubate the bacteria at a suitable temperature. The exact temperature would depend on the species of bacteria, but many marine bacteria grow best at temperatures around 15-20 degrees Celsius.

Remember, this is a general guide. The exact composition of your medium might need to be adjusted depending on the specific needs of the bacteria you're trying to grow.

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