TLS Online TPP Program

#Question id: 11934


Which of the following represents the basis for transduction of a sensory stimulus into nerve impulses?

#Unit 7. System Physiology – Animal
  1. Change in the ion permeability of the receptor membrane
  2. Generation of an action potential
  3. Inactivation of a G-protein–mediated response
  4. Protein synthesis
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TLS Online TPP Program

#Question id: 627

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is correct ‘Dixon Plot’ for competitive inhibition for enzymes 

TLS Online TPP Program

#Question id: 626

#Unit 1. Molecules and their Interaction Relevant to Biology

A metabolic pathway proceeds according to the scheme, R -> S -> T -> U -> V -> W.  A regulatory enzyme, X, catalyzes the first reaction in the pathway.  Which of the following is most likely correct for this pathway?

TLS Online TPP Program

#Question id: 625

#Unit 1. Molecules and their Interaction Relevant to Biology

For enzymes in which the slowest (rate-limiting) step is the reaction Km becomes equivalent to:

TLS Online TPP Program

#Question id: 624

#Unit 1. Molecules and their Interaction Relevant to Biology

The following data were obtained in a study of an enzyme known to follow Michaelis-Menten kinetics: The Km for this enzyme is approximately:

TLS Online TPP Program

#Question id: 623

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of these statements about enzyme-catalyzed reactions is false?

TLS Online TPP Program

#Question id: 622

#Unit 1. Molecules and their Interaction Relevant to Biology

An enzyme-catalyzed reaction was carried out with the substrate concentration initially a thousand times greater than the Km for that substrate.  After 9 minutes, 1% of the substrate had been converted to product, and the amount of product formed in the reaction mixture was 12 micromol.  If, in a separate experiment, one-third as much enzyme and twice as much substrate had been combined, how long would it take for the same amount (12 micromol) of product to be formed?