Scientists found that polypeptides that are normally synthesized in the endoplasmic reticulum are about 20 amino acids longer when they are synthesized by ribosomes not attached to the endoplasmic reticulum. What is/are possible explanations for the greater length of these polypeptides? a) The ribosomes that function as free ribosomes function differently than the ribosomes that are attached to the endoplasmic reticulum. b) The 20-amino-acid sequence helps the endoplasmic reticulum package these proteins for shipping to the Golgi. c) The protein has a different function in the cytosol than in the endoplasmic reticulum. d) The 20 amino acids serve as a signal sequence that directs the forming polypeptide to the endoplasmic reticulum, where they are cleaved off during processing.

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Researchers tried to explain how vesicular transport occurs in cells by attempting to
assemble the transport components. They set up microtubular tracks along which
vesicles could be transported, and they added vesicles and ATP (because they knew
the transport process requires energy). Yet, when they put everything together, there
was no movement or transport of vesicles. What were they missing?
a) motor proteins
b) an axon
c) contractile microfilaments
d) endoplasmic reticulum
Transcribed Image Text:Researchers tried to explain how vesicular transport occurs in cells by attempting to assemble the transport components. They set up microtubular tracks along which vesicles could be transported, and they added vesicles and ATP (because they knew the transport process requires energy). Yet, when they put everything together, there was no movement or transport of vesicles. What were they missing? a) motor proteins b) an axon c) contractile microfilaments d) endoplasmic reticulum
Scientists found that polypeptides that are normally synthesized in the endoplasmic
reticulum are about 20 amino acids longer when they are synthesized by ribosomes
not attached to the endoplasmic reticulum. What is/are possible explanations for the
greater length of these polypeptides?
a) The ribosomes that function as free ribosomes function differently than the
ribosomes that are attached to the endoplasmic reticulum.
b) The 20-amino-acid sequence helps the endoplasmic reticulum package these
proteins for shipping to the Golgi.
c) The protein has a different function in the cytosol than in the endoplasmic
reticulum.
d) The 20 amino acids serve as a signal sequence that directs the forming
polypeptide to the endoplasmic reticulum, where they are cleaved off during
processing.
Transcribed Image Text:Scientists found that polypeptides that are normally synthesized in the endoplasmic reticulum are about 20 amino acids longer when they are synthesized by ribosomes not attached to the endoplasmic reticulum. What is/are possible explanations for the greater length of these polypeptides? a) The ribosomes that function as free ribosomes function differently than the ribosomes that are attached to the endoplasmic reticulum. b) The 20-amino-acid sequence helps the endoplasmic reticulum package these proteins for shipping to the Golgi. c) The protein has a different function in the cytosol than in the endoplasmic reticulum. d) The 20 amino acids serve as a signal sequence that directs the forming polypeptide to the endoplasmic reticulum, where they are cleaved off during processing.
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