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TLS Online TPP Program

#Question id: 549

Which one of the following statements is true of enzyme catalysts?

#SCPH06 I Botany

  1. They bind to substrates, but are never covalently attached to substrate or product.

  2. They increase the equilibrium constant for a reaction, thus favoring product formation.

  3. They increase the stability of the product of a desired reaction by allowing ionizations, resonance, and isomerizations not normally available to substrates.

  4. They lower the activation energy for the conversion of substrate to product.

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TLS Online TPP Program

#Question id: 14254

#SCPH05 I Biotechnology

Hybridoma cells immobilized on surfaces of Sephadex beads are used in a packed column for production of monoclonoal antibodies (Mab). Hybridoma concentration is approximately X = 5 g/l in the bed. The flow rate of the synthetic medium and glucose concentration are Q = 2 l/h and S0 = 40 g/l, respectively. The rate constant for Mab formation is k = 1 gX/l-d. Assume that there are no diffusion limitations and glucose is the rate limiting nutrient.  Determine the height of the packed bed for 95% glucose conversion. Bed diameter is D0 = 0.2 m. Neglect the growth of the hybridomas and assume first order kinetics. 
TLS Online TPP Program

#Question id: 13053

#SCPH28 | Zoology

What would the generally expected effect on the PCR reaction be of adjustments that increase the temperature of the annealing phase and the length of the elongation phase?
TLS Online TPP Program

#Question id: 9169

#SCPH06 I Botany

In areas of permafrost, stands of black spruce are frequently observed in the landscape, while other tree species are noticeably absent. Often these stands are referred to as "drunken forests" because many of the black spruce often "lean over" (that is, they are displaced from their normal vertical alignment). What is the most likely explanation for the unusual growth of these forests in this marginal habitat?
TLS Online TPP Program

#Question id: 2607

#SCPH05 I Biotechnology

The precursor amino acid + enzyme of trp is ;
TLS Online TPP Program

#Question id: 2096

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

Movement of phospholipids from one leaflet to the other