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TLS Online TPP Program

#Question id: 11145

Two fundamental concepts about the ion channels of a "resting" neuron are that the channels ________.

#I Life Science/ Life Sciences Group – I-V
  1. are always open, but the concentration gradients of ions frequently change
  2. are always closed, but ions move closer to the channels during excitation
  3. are open or closed depending on their type, and are specific as to which ion can traverse them
  4. open in response to stimuli, and then close simultaneously, in unison
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TLS Online TPP Program

#Question id: 1746

#SCPH05 I Biotechnology

Which is the first of the following genes to be upregulated subsequent to T-cell activation?
TLS Online TPP Program

#Question id: 14934

#SCPH05 I Biotechnology

E. coli was continuously cultured in a continuous stirred tank fermenter with a working volume of 1.0 I by chemostat. A medium containing 4.0 g1-1 of glucose as a carbon source was fed to the fermenter at a constant flow rate of 0.5 I h-1, and the glucose concentration in the output stream was 0.20 g I-1. The cell yield with respect to glucose YxS was 0.42 g dry cells per gram glucose. Determine specific growth rate 
TLS Online TPP Program

#Question id: 3888

#SCPH05 I Biotechnology

Which of these polymerases does not require a template?
TLS Online TPP Program

#Question id: 1734

#SCPH01 Biochemistry

The nuclear AP-1 site responsible for 90% of IL-2 enhancer activity binds:
TLS Online TPP Program

#Question id: 2064

#SCPH01 Biochemistry

What kinds of molecules pass through a cell membrane most easily?