Protein processing and transportation

chang190

wrote...

13 years ago

Identify if the following are true or false:

1.Proteins that are destined for either the ER or the cytoplasm initiate translation in the cytoplasm.
2.Proteins fully translated in the cytoplasm always function in the cytoplasm.
3.Proteins made at the surface of the RER always have the finished protein product embedded in the RER's membrane.
4. A given ribosome on the RER will always be attached to the RER.

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bio_man

wrote...

Educator

13 years ago

1.Proteins that are destined for either the ER or the cytoplasm initiate translation in the cytoplasm. F
2.Proteins fully translated in the cytoplasm always function in the cytoplasm. T
3.Proteins made at the surface of the RER always have the finished protein product embedded in the RER's membrane. F
4. A given ribosome on the RER will always be attached to the RER. T

Your thoughts?

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chang190 Author

wrote...

13 years ago

For the first statement, isnt it true that all translations take place in the cytoplasm?

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bio_man

wrote...

Educator

13 years ago

It was the wording that mislead me Face with Open Mouth

because it uses the preposition "or" as opposed to "and," but you brought up a good point, it does makes sense to say T. By the way, what's your textbook? I could probably get the test-bank.

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chang190 Author

wrote...

13 years ago

My textbook is:

The Cell: a molecular approach-5th edition by Cooper and Hausman

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bio_man

wrote...

Educator

13 years ago

Do you know about this website: http://www.sinauer.com/cooper5e/ ?

That's too bad, if it were a Pearson Textbook, we would have access to all the questions/answers. We have no connections with Sinauer. Sad Dummy

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chang190 Author

wrote...

13 years ago

btw, how about the 4th statement? Why is it true?

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duddy

wrote...

Staff Member

13 years ago

Good eye, it should be false because ribosomes bound to the RER at any one time are not a stable part of this organelle's structure as ribosomes are constantly being bound and released from the membrane.

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- Master of Science in Biology
- Bachelor of Science

bio_man

wrote...

Educator

13 years ago

Thx

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