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TLS Online TPP Program

#Question id: 11125

In chemical synapses that involve a so-called second messenger, typically a G-protein linked to the postsynaptic receptor is activated when neurotransmitter binds to that receptor. Which of the following represents an activity performed by the activated second messenger?

#Unit 7. System Physiology – Animal
  1. Closure of a membrane channel for sodium or potassium
  2. Activation of cyclic AMP or cyclic GMP
  3. Inactivation of enzymes that initiate biochemical reactions in the postsynaptic neuron
  4. Inactivation of gene transcription in the postsynaptic neuron
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TLS Online TPP Program

#Question id: 7293

#Unit 5. Developmental Biology

In agamous mutant (flower within flower phenotype) which of the following statements is valid?
TLS Online TPP Program

#Question id: 11970

#Unit 7. System Physiology – Animal

Why do the cells of the digestive system secrete proteolytic enzymes, such as pepsin, in their inactive forms?
TLS Online TPP Program

#Question id: 2952

#Unit 2. Cellular Organization

Throughout interphase,.. .........  are synthesized at a relatively constant rate, whereas  ............ are synthesized only during the S phase.
TLS Online TPP Program

#Question id: 10979

#Unit 7. System Physiology – Animal

Which of the following conditions at the A-V node will cause a decrease in heart rate?
TLS Online TPP Program

#Question id: 10986

#Unit 7. System Physiology – Animal

Which of the following conditions at the A-V node will cause a decrease in heart rate?