​Hollow fibers also provide a tremendous amount of surface area in a small volume. Cells grow on and around the fibers at densities of greater than 1 x 10⁸ per mL.
Hollow fiber cell culture is the only means to culture cells at in vivo like cell densities.

Correct Option: C

​Hollow fibers also provide a tremendous amount of surface area in a small volume. Cells grow on and around the fibers at densities of greater than 1 x 10⁸ per mL.
Hollow fiber cell culture is the only means to culture cells at in vivo like cell densities.

The power number, N_P is a commonly-used dimensionless number relating the resistance force to the intertia force. ​​The power number has different specifications according to the field of application e.g., for stirrers, the power number is defined as :

Correct Option: C

The power number, N_P is a commonly-used dimensionless number relating the resistance force to the intertia force. ​​The power number has different specifications according to the field of application e.g., for stirrers, the power number is defined as :

The degree of protein purity required depends on the intended end use of the protein. For some applications, a crude extract is sufficient. However, for other uses, such as in foods and pharmaceuticals, a high level of purity is required. In order to achieve this, several protein purification methods are typically used, in a series of purification steps. Protein purification step also differs for intra-cellular and extra-cellular products.

Correct Option: D

The degree of protein purity required depends on the intended end use of the protein. For some applications, a crude extract is sufficient. However, for other uses, such as in foods and pharmaceuticals, a high level of purity is required. In order to achieve this, several protein purification methods are typically used, in a series of purification steps. Protein purification step also differs for intra-cellular and extra-cellular products.

Penicillium chrysogenum utilizes phenylacetic acid as a side chain precursor in penicillin G biosynthesis. During industrial production of penicillin G, phenylacetic acid is fed in small amounts to the medium to avoid toxic side effects. Phenylacetic acid is taken up from the medium and intracellularly coupled to 6-aminopenicillanic acid.

Correct Option: A

Penicillium chrysogenum utilizes phenylacetic acid as a side chain precursor in penicillin G biosynthesis. During industrial production of penicillin G, phenylacetic acid is fed in small amounts to the medium to avoid toxic side effects. Phenylacetic acid is taken up from the medium and intracellularly coupled to 6-aminopenicillanic acid.

To prevent contamination of either the fermentation by air-borne microorganisms or the environment by aerosols generated within the fermenter, both air input and air exhaust ports have air filters such as glass fibre filters, mineral fibers filters.

Correct Option: D

To prevent contamination of either the fermentation by air-borne microorganisms or the environment by aerosols generated within the fermenter, both air input and air exhaust ports have air filters such as glass fibre filters, mineral fibers filters.