Select the correct statement.

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(A) $1$. When a gene encoding a protein is expressed in a heterologous host,the resulting protein is known as a recombinant protein. This is a correct

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When a gene encoding a protein is expressed in a heterologous host,the resulting protein is called a recombinant protein.

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(A) $1$. When a gene encoding a protein is expressed in a heterologous host,the resulting protein is known as a recombinant protein. This is a correct statement.$2$. In a bioreactor,optimal growth conditions (temperature,pH,substrate,salts,vitamins,oxygen,etc.) are provided. Carbon monoxide is toxic to cells and is not provided; instead,oxygen is supplied. Thus,option $B$ is incorrect.$3$. After the synthesis of products,they undergo downstream processing (separation and purification) before being sent to the market. Thus,option $C$ is incorrect.$4$. Stirred-tank reactors are usually cylindrical or have a curved base to facilitate the mixing of the reactor contents. They are not spherical. Thus,option $D$ is incorrect.

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