A couple of questions

Discussion of all aspects of cellular structure, physiology and communication.

Moderators: honeev, Leonid, amiradm, BioTeam

emyers
Garter
Garter
Posts: 1
Joined: Sat Jan 13, 2007 8:00 am

A couple of questions

Post by emyers » Sat Jan 13, 2007 8:02 am

I had a few questions you might be able to help me with

the first one is Where within the cell does transcription occur and also werhe within the cell does translation occur?

User avatar
MrMistery
Inland Taipan
Inland Taipan
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)
Contact:

Post by MrMistery » Sat Jan 13, 2007 12:15 pm

check our tutorials or any genetics book
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

Tan Tze Chein
Garter
Garter
Posts: 32
Joined: Sat Jan 13, 2007 4:59 am

Post by Tan Tze Chein » Sat Jan 13, 2007 12:34 pm

Transcription is a process where the DNA codon on the DNA was transcripted to RNA codon in mRNA, thus it is occurs in the nucleoplasm of the cell. Translation is the process where mRNA was transcripted to a sequences of amino acids in a polypeptide chain.translation occurs in two different places. If the polypeptide is required outside the cell ,the translation process will occurs in the Rough Endoplasmic Reticulum (RER). If the polypeptide required inside the cell, The translation process will take place in the cytoplasm.

User avatar
sachin
King Cobra
King Cobra
Posts: 1517
Joined: Mon Jan 30, 2006 12:39 pm
Location: MUMBAI / INDIA
Contact:

Post by sachin » Sat Jan 13, 2007 3:30 pm

Tan Tze Chein wrote:Transcription is a process where the DNA codon on the DNA was transcripted to RNA codon in mRNA, thus it is occurs in the nucleoplasm of the cell. Translation is the process where mRNA was transcripted to a sequences of amino acids in a polypeptide chain.translation occurs in two different places. If the polypeptide is required outside the cell ,the translation process will occurs in the Rough Endoplasmic Reticulum (RER). If the polypeptide required inside the cell, The translation process will take place in the cytoplasm.


I think In both the cases RER is required..... :wink:
Senior Education Officer, BNHS, India. www.bnhs.org

Bitter Truth!
Who says reason for world war III will be Petrol?
Reason lies in two words "Me and Mine".

Tan Tze Chein
Garter
Garter
Posts: 32
Joined: Sat Jan 13, 2007 4:59 am

Post by Tan Tze Chein » Sun Jan 14, 2007 8:47 am

Can sachin tell me what is the uses of the free ribosomes in the cytoplasm of the cell?

sdekivit
King Cobra
King Cobra
Posts: 586
Joined: Sat Jul 30, 2005 7:16 pm
Location: holland
Contact:

Post by sdekivit » Sun Jan 14, 2007 9:01 am

in my opinion: both take place in the cytoplasm: the ribosomes are the 'translation factories' inside the cell, and bound to the rER or not, translation takes place in the cytoplasm.

--> when associated to the rER it's coupled to a signal chain that leads to protein directly transported into the rER.

But there are also free ribosomes in the cytoplasm, that synthesize proteins that do not have to cross a membrane (thus enzymes like those involved in glycolysis)

User avatar
sachin
King Cobra
King Cobra
Posts: 1517
Joined: Mon Jan 30, 2006 12:39 pm
Location: MUMBAI / INDIA
Contact:

Post by sachin » Sun Jan 14, 2007 4:12 pm

Tan Tze Chein wrote:Can sachin tell me what is the uses of the free ribosomes in the cytoplasm of the cell?


I dont know.......... :oops:

Because what I know is "Ribosomes along wih mRNA get attach to RER to start synthesis"........... :P

do you ve any correction...... Obejections are welcomed... :o
Senior Education Officer, BNHS, India. www.bnhs.org

Bitter Truth!
Who says reason for world war III will be Petrol?
Reason lies in two words "Me and Mine".

User avatar
MrMistery
Inland Taipan
Inland Taipan
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)
Contact:

Post by MrMistery » Sun Jan 14, 2007 5:04 pm

yeah, i have an objection. Synthesis starts in the cytoplasm(by this i mean before the ribosome is attached), then it reaches the signal sequence and then it attaches to the endoplasmic reticulum
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

sdekivit
King Cobra
King Cobra
Posts: 586
Joined: Sat Jul 30, 2005 7:16 pm
Location: holland
Contact:

Post by sdekivit » Sun Jan 14, 2007 8:41 pm

sachin_at_biog wrote:
Tan Tze Chein wrote:Can sachin tell me what is the uses of the free ribosomes in the cytoplasm of the cell?


I dont know.......... :oops:

Because what I know is "Ribosomes along wih mRNA get attach to RER to start synthesis"........... :P

do you ve any correction...... Obejections are welcomed... :o


and objection 2: not all ribosmes attach to the rER. some stay unbound and thus free in the cytosol.

Doc44
Coral
Coral
Posts: 112
Joined: Sat Feb 25, 2006 2:53 am

Post by Doc44 » Mon Jan 15, 2007 5:14 am

"It's never just a game when I'm winning!"

Signed,
Mister Cheese

It is not if you win or loose that matters.

Doc44

It's how bad I beat the guy that comes in second that matters.

User avatar
Dustfinger
King Cobra
King Cobra
Posts: 1448
Joined: Thu Aug 10, 2006 7:22 pm
Location: Somewhere in the endless Universe

Post by Dustfinger » Mon Jan 15, 2007 10:58 am

I think it matters whether you win by fair means or you cheat....
Image
Image

User avatar
sachin
King Cobra
King Cobra
Posts: 1517
Joined: Mon Jan 30, 2006 12:39 pm
Location: MUMBAI / INDIA
Contact:

Post by sachin » Mon Jan 15, 2007 2:45 pm

ya Dusty is right..........

But what those free ribosomes do... If active in cytosol...
Senior Education Officer, BNHS, India. www.bnhs.org

Bitter Truth!
Who says reason for world war III will be Petrol?
Reason lies in two words "Me and Mine".

Post Reply

Who is online

Users browsing this forum: No registered users and 7 guests