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signal transduction, which of the following are correct

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signal transduction, which of the following are correct

Postby nickname » Mon Nov 08, 2010 9:33 pm

I have to pick the correct six statements from the following. Could you tell me if my answer is correct? Thank you!

a) signal transduction cascades, often involving protein kinases, amplify a signal intracellularly.

b) a receptor may pass on a signal by interacting with another protein or by acting as an enzyme.

c) phosphatases remove phosphoryl groups from polypeptides, regulating a cell's response.

d) a ligand phosphorylates protein residues, ending the signaling cascade inside the cell.

e) a second messenger carries a signal from a tissue or organ to a target cell.

f) a ligand, such as a hormone, binds to a specific cell surface receptor on a target cell.

g) signal transduction cascades directly transmit a single stimulus to a single target.

h) a receptor changes conformation upon binding, transmitting a signal across the cell membrane.

i) a second messenger may carry a signal from the cell mebrane to an organelle.

I think that all are correct excluding statements d, e, and g. Is my answer correct?

Thank you for your help!
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Postby canalon » Mon Nov 08, 2010 9:37 pm

I would agree with you. But caveat emptor.

Science has proof without any certainty. Creationists have certainty without
any proof. (Ashley Montague)
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Postby JackBean » Tue Nov 09, 2010 10:38 am

c) phosphatase may act also on low-weigth substrates, but regarding the signal pathways this is correct

h) I would think about this...

otherwise agree

Cis or trans? That's what matters.
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