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Summary Topic 3 Secretory Pathway

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Edexcel Biology Topic 3 Secretory Pathway, Modification, Exocytosis.

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OCR
Course
Topic 3








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Study Level
A/AS Level
Examinator
OCR
Subject
Biology A
Unit
Topic 3
All documents for this subject (10)

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Uploaded on
January 19, 2025
Number of pages
2
Written in
2022/2023
Type
Summary

Subjects

  • topic 3
  • edexcel
  • biology

Content preview

Secretory Pathway
Protein transport

-hor DNA is
transferred from DNA to
being released
S.I units
DNA
- ·
DNA unwinds as DNA helicase breaks
hydrogen bonds
polypeptide between bases
chwin
·
free RNA nucleotides bind via complementary buse
bonds
pairing forming hydrogen
.



RNA
·

polymerase forms phosphodiester bands in

condensation reaction
a to
form he phosphodiester
backbone

·
MPNA is
formed and detaches from DNA
leaving nucleus
via nuclear pore

·
at the ribosome on the endoplasmic reticulum
. mRNA

binds he small submit
to


·

tRNA transports specific amino acid
complementary
to he triplet of mRNA

·



Polypeptide
bonds
is synthesised in condensation reaction
forming
Pepticle


Protein >
-
Polypeptide enters the Lumen of ER

folding ↳ folds into either & -helices or beth pleated
sheet structure
in
secondary
↳ then stypes of bonding
into
tertiary structure

-
then packaged into transport resicle
by being pinched
off
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