Question

A signal transduction cascade with amplification will most likely occur after the activation of a(n) ___...

A signal transduction cascade with amplification will most likely occur after the activation of a(n) ___ receptor.

a. Nuclear

b. Desmosomal

c. Ion Channel

d. G Protein coupled

Lipophilic/Diffusible signals are typically going to activate what type of receptor?

a. G protein coupled

b. ion channel

c. desmosomal

d. nuclear

During receptor mediated endocytosis, which proteins pucker the membrane?

a. The receptor

b. the rough ER

c. Clathrin

d. Dynamin

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Homework Answers

Answer #1

1.G protein, nuclear receptor and ion channel receptor are the answer.

Receptors are the first molecules which receive a stimuli. The receptor can be of different types such as G protein coupled receptor, nuclear receptor, ion channel linked receptors. When ligand binds to all the above receptors signal transduction will happen.

Desmosones are intracellular junctions and there is no particular type of desmosomal receptor.

2. Nuclear receptor is the answer.

Only highly lipophillic ligands could permeate the membrane and reach the nucleus.  

G protein and ion channel receptors are transmembrane receptors .

3. Dynamin. It is a GTPase enzyme with twisting activity. During endocytosis, the cell membrane invaginates to form a budding vesicle and Dynamin involved in the pucking and scission of newly formed vesicles.  

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