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Biochemistry - Cell Signalling and Transduction - Discussion

Discussion Forum : Cell Signalling and Transduction - Section 1 (Q.No. 25)
Cell Signalling and Transduction
25.
A signal cascade induced by adrenaline or thyroxine
must begin with receipt of the signal molecule by a surface receptor
involves the activation of a G protein
results in the activation of a sequence of enzymes needed for the cell effect
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
4 comments Page 1 of 1.
Pirasath said:   1 decade ago
Adrenalin, thyroxine acts on receptors which are located in the cell. Then how option D is possible. They don't involve in coupled receptors.
Patrick said:   10 years ago
Epinephrine is a hydrophilic hormone while thyroxine is hydrophobic. Adrenergic (epinephrine, aka "adrenaline") receptors are cell-surface receptors while thyroxine receptors are intra-cellular receptors.
Soumitra Ghosh said:   7 years ago
Thyroxin has intracellular receptors. Then how can be D is the right option?
GULSHAN Thakur said:   6 years ago
C can be the answer.

Or the instead of thyroxin it can be TSH then answer would be D.
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