Mug Mug Mug

Mug Mug Mug
I am sure you are in the heat of things now.

I did not manage to catch/see a few of you for the past one and a half week esp some of the 3S's but I understand that you may be trying to clear that huge pile of bio readings and not ready to see me...so I can only wish you the best.

Good Luck to all yah!

Why repressible operon- anabolic and inducible - catabolic

A question ask by Phil but my edumail is down so I couldnt get to reply via that channel. A good question nonetheless.

A repressible operon is such so that the end-product of an anabolic pathway can regulate the pathway as negative feedback - no wastage of resources; no need to produce more product.

A inducible pathway is also to prevent wastage of resources because it will only be 'on' if the conditions are right e.g. in the case of the lac operon, if there is a ready source of glucose, why waste energy to hydrolyse lactose?

Format of Paper

Knock knock.
Pls check your 'Revision Promotional Examination 2006'for the format yah?
Although it could be lying somewhere in that stack of chemistry notes.

Provirus? Is it actively transcribed?

Nope.

A provirus is not active while integrated into a host genome in this way. Instead, it is passively replicated along with the host genome and passed on to the original cell's offspring; all descendants of the infected cell will also bear proviruses in their genomes. Eventually, in response to changes in the host's environmental conditions or health, the provirus will be activated and will serves as a template for massive transcription of its viral genome.

http://en.wikipedia.org/wiki/Provirus

What happens to T4 Empty Capsid after Injection ?

What happens to the empty capsid after the phage genome has been injected into the bacteria?

It usually remains on the cell surface until environment favors its dissociation
(activation energy necessary for dissociation of capsids is very high)