Question 4 and 5 Exercise 5Membrane receptors are proteins that are incorporated in the cytoplasmic membrane of a cell, allowing thedetection of specific molecules such as (hormones, growth factor) and triggering a cascade of biochemicalSynthesis of proteinreactions.The adjacent schema represents the steps ofthe synthesis of these membrane receptors.1. Label the structures from a to f.In order to study the biosynthesis andsecretion of this protein (membranereceptors), a solution containing radioactiveamino acid was injected in the blood of ananimal. Samples of certain cells were takenat regular intervals of time. The intensity ofradioactivity was measured in differentcellular organelles.2000The table below represents the variations of the quantity of a membrane protein in different parts of the cell,as function of time.Time (min)154050Structure X261221Structure Z0.6.106.Structure Y0.10242. Represent the obtained results in the form3. 3.1. Analyze the obtained results.3.2.What can you conclude concerning the pathway of the synthesized protein through thedifferent cellular organelles?graph.4. Indicate the name of each of the organelles X, Y and Z.5. 5.1. What is the fate of the proteins synthesized in these organelles?5.2.Name the phenomenon (g) that takes place at the level of the cytoplasmic membrane.

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Membrane receptors are proteins that are incorporated in the cytoplasmic membrane of a cell, allowing the detection of specific molecules such as (hormones, growth factor) and triggering a cascade of biochemical reactions.

Membrane receptors are proteins that are incorporated in the cytoplasmic membrane of a cell, allowing the detection of specific molecules such as (hormones, growth factor) and triggering a cascade of biochemical reactions.

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter31: Completing The Protein Life Cycle: Folding, Processing, And Degradation

Section: Chapter Questions

Problem 9P

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Question

Question 4 and 5

Exercise 5
Membrane receptors are proteins that are incorporated in the cytoplasmic membrane of a cell, allowing the
detection of specific molecules such as (hormones, growth factor) and triggering a cascade of biochemical
Synthesis of protein
reactions.
The adjacent schema represents the steps of
the synthesis of these membrane receptors.
1. Label the structures from a to f.
In order to study the biosynthesis and
secretion of this protein (membrane
receptors), a solution containing radioactive
amino acid was injected in the blood of an
animal. Samples of certain cells were taken
at regular intervals of time. The intensity of
radioactivity was measured in different
cellular organelles.
2000
The table below represents the variations of the quantity of a membrane protein in different parts of the cell,
as function of time.
Time (min)
15
40
50
Structure X
26
12
2
1
Structure Z
0.
6.
10
6.
Structure Y
0.
10
24
2. Represent the obtained results in the form
3. 3.1. Analyze the obtained results.
3.2.What can you conclude concerning the pathway of the synthesized protein through the
different cellular organelles?
graph.
4. Indicate the name of each of the organelles X, Y and Z.
5. 5.1. What is the fate of the proteins synthesized in these organelles?
5.2.Name the phenomenon (g) that takes place at the level of the cytoplasmic membrane.

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