Small metabolites, such as sugar and ions, pass between plant cells via _______

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#Question id: 2297

#Section 3: Genetics, Cellular and Molecular Biology

Which structure is composed of phospholipids and regulates the movement of substances in and out of cells?

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#Question id: 1704

#Section 2: General Biology

The single best unique description of the interaction of the αβ T-cell receptor with peptide-MHC is that it:

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#Question id: 1851

#Section 2: General Biology

Which of the following is a feature of a Salmonella-based vaccine expressing antigens from other infectious agents?

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#Question id: 15916

#Section 6: Plant, Animal and Microbial Biotechnology

Recombination of different types of cells to form more defined tissue or organ is known as __________________ 

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#Question id: 14232

#Section 5: Bioprocess Engineering and Process Biotechnology

Nutrient medium is to be heated from 10⁰C to 28⁰C is a single-pass countercurrent shell-and-tube heat exchanger before being pumped into a fed-batch fermenter. Medium passes through the tubes of the exchanger; the shell-side fluid is water which enters with flow rate 3 x 10^4 kg h^- 1 and temperature 60⁰C pre-heated medium is required at a rate of 50 m^3 h^-1. The density, viscosity and heat capacity of the medium are the same as water; the thermal conductivity of the medium is 0.54 Wm^- 1 ⁰C^ - 1. It is proposed to use 30 steel tubes with inner diameter 5 cm; the tubes will be arranged in line. The pipe wall is 5-mm thick; the thermal conductivity of the metal is 50 Wm^- 1 ⁰C^ - 1. The maximum linear shell-side fluid velocity is estimated as 0.15 m s^-1. What is the rate of heat transfer?