Not all intercellular signals require transduction. Which one of the following signals would be processed without transduction?

#Question id: 3660

#SCPH01 Biochemistry

Which of the following is true for exchange of homologous regions between two DNA molecules?

#Question id: 19337

#SCPH01 Biochemistry

#Question id: 2071

#I Life Science/ Life Sciences Group – I-V

Diffusion of ions across membranes through specific ion channels is driven by:

#Question id: 4152

#SCPH01 Biochemistry

The pathway for polypeptides exported from E. coli includes the following steps, which occur in what order for correct export?

1.  A chaperone, SecA, binds to the polypeptide.

2.  A chaperone, SecB, binds to the polypeptide.

3.  ATP is hydrolyzed by Sec A.

4.  SecA pushes 20 amino acids of the polypeptide into the translocation complex.

#Question id: 14296

#SCPH05 I Biotechnology

A two-stage chemostat system is used for production of secondary metabolite. The volume of each reactor is 0.5 m³; the flow rate of feed is 50 l h^{- 1}. Mycelial growth occurs in the first reactor; the second reactor is used for product synthesis. The concentration of substrate in the feed is 10 gl^-1. Kinetic and yield parameters for the organism are:

Assume that product synthesis is negligible in the first reactor and growth is negligible in the second reactor. Determine cell concentrations entering the second reactor.