Practice Questions

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?

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

Closure of a membrane channel for sodium or potassium
Activation of cyclic AMP or cyclic GMP
Inactivation of enzymes that initiate biochemical reactions in the postsynaptic neuron
Inactivation of gene transcription in the postsynaptic neuron

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A cross is made between two plants with white flowers. All the F1 progeny had red colored flower. This is because of

#Question id: 1113

#SCPH28 | Zoology

Consider this pathway:

epinephrine → G protein-coupled receptor → G protein → adenylyl cyclase → cAMP

The second messenger in this pathway is:

#Question id: 12751

#SCPH01 Biochemistry

#Question id: 3537

#SCPH28 | Zoology

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