Lecture 3-4 ER

Question 1

Function of ER

Answer 1

ER: modifying proteins for specific function

Question 2

3. Rough Endoplasmic reticulum

Answer 2

a. Ribosomes
b. Involved in specific protein synthesis of enzymes, structural proteins (that’s why it needs ribosomes since it goes straight in ER)

Question 3

4. Smooth endoplasmic reticulum

Answer 3

a. Detoxifies substances
b. Stronger proteins
c. Synthesis of lipids becoming part of cell membranes

Question 4

• Cisternae: membranous channels and vesicles of the ER

Answer 4

o Each surrounded by ER lumen

o ER lumen chemically modifies proteins made on RER

Question 5

• Folds of ER: increases surface area (refer to why are cells so small? = surface area to volume efficiency)
• Individual folds=cisternae
  o box

Answer 5

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Question 6

• Rough ER lumen:

o Opening, window

Answer 6

hh

Question 7

• Both RE and SER possess cisternae and lumen

- ER and SER serve different functions, make different things

Answer 7

hh