3.2.1 Cellular Function: Endoplasmic Reticulum

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1

You might expect that pancreatic cells would contain large amounts of

rough endoplasmic reticulum.

2

Which organelle will produce steroid hormones in the testes and adrenal cortex while detoxifying alcohol in the liver?

1. smooth endoplasmic reticulum

2. rough endoplasmic reticulum

3. ribosomes

4. Golgi apparatus

1. smooth endoplasmic reticulum

3

True or False?

A cell that is actively involved in synthesizing proteins for export from the cell contains large amounts of rough endoplasmic reticulum.

True

4

True or False?

The ER is involved in the synthesis of carbohydrates

False

carbohydrates are not in the synthesis of the ER

5

True or False?

Proteins manufactured in the rough ER are secreted into the cytoplasm.

False

6

Proteins are present in both the ________ and _________ ER.

Smooth and rough

7

The folds of the ER are

1. cristae.

2. grana.

3. cisternae.

4. stroma.

3. cisternae

8

The endoplasmic reticulum, (ER), or “inner plasma network”, is a series of interconnected membranous channels in the cell’s

cytoplasm

9

After a polypeptide chain is formed on a ribosome, it moves into the lumen (inner space) of the

ER.

10

The rough endoplasmic reticulum is connected to ribosomes. The rough ER is responsible for processing and altering
proteins:
· The proteins are _________ from primary to tertiary structure.
· Portions of carbohydrate can be added to the _________.
· The proteins can be incorporated into the __ itself

1. Converted

2. Proteins

3. ER