Search found 30 matches

by paperclip
Tue Oct 04, 2005 8:42 am
Forum: Cell Biology
Topic: speed of movement in the cell
Replies: 1
Views: 1615

jumpping jellybeans! Has anyone done it without radioisotopes or fluorescent dyes><?
by paperclip
Tue Oct 04, 2005 6:46 am
Forum: Cell Biology
Topic: speed of movement in the cell
Replies: 1
Views: 1615

Alberts said that it took an organic molecule one-fifth of a second to travel a distance of 10 microns in a cell. That's one-fourth of a cell's diameter! YOu mean they measure it from end to end?????????????
by paperclip
Mon Oct 03, 2005 3:06 pm
Forum: Cell Biology
Topic: enzyme and substrate
Replies: 13
Views: 10081

Hope this doesn't sound a bit toffygoshy but do substrates actually collide or crash into the active site of the enzyme as if by chance or do they migrate in some seemingly predicatble way into the cleft of the active site? And while they remain in the 'cavern' of that cleft, do they seek out hidy h...
by paperclip
Mon Oct 03, 2005 4:23 am
Forum: Cell Biology
Topic: fat cell
Replies: 18
Views: 11126

That's not fair! If all metabolism takes place at the cell membrane than why is the cytosol not all membranes and no conduits?
by paperclip
Sun Oct 02, 2005 7:49 am
Forum: General Discussion
Topic: Anisotropy - Help!
Replies: 0
Views: 1742

Anisotropy - Help!

The theoretical maxium for kcat/Km is about 108 to 109 (mol/L)-1s-1. At this point, every collision of the enzyme with its substrate will result in catalysis. Some enzymes, such as fumarase, actually approach this limit. My questions are: 1) How do enzymes manage to grab substrates from the solution...
by paperclip
Fri Sep 30, 2005 7:55 am
Forum: Cell Biology
Topic: enzyme and substrate
Replies: 13
Views: 10081

No wonder

That was a great website!
by paperclip
Thu Sep 29, 2005 7:06 am
Forum: Cell Biology
Topic: enzyme and substrate
Replies: 13
Views: 10081

Enzyme kinetics

What is the rate laws governing substrate enzyme interaction. There should be two coefficients given that this interaction is reversible (in normal cases).
by paperclip
Thu Sep 29, 2005 7:00 am
Forum: General Discussion
Topic: Need help with some bio questions. cant seem to find answers
Replies: 6
Views: 4672

Nitrate levels

How about the buffering capacity of hydrocarbonates in fresh water samples, not to mention the effects of metallic cations and metallic anions? like how about sulphates too?
by paperclip
Wed Sep 28, 2005 3:28 am
Forum: Microbiology
Topic: Mathematics
Replies: 4
Views: 3546

Mathematics

Isn't exponential growth the exact reverse of exponential deterioration?
by paperclip
Thu Sep 22, 2005 3:33 pm
Forum: Cell Biology
Topic: fat cell
Replies: 18
Views: 11126

Erm how about Na+ and K+ in transit between the bilayer?
by paperclip
Thu Sep 22, 2005 11:10 am
Forum: General Discussion
Topic: Amoeboid
Replies: 0
Views: 1796

Amoeboid

Has there been any new news on amoebas? Last I read, the cytoplasm is made of sol and gel. The membrane must still be a lipid bilayer, but it is not going to burst in pond water because its got some kind of jelly like substance or maybe an armour or basically a basal laminar that is like kevlar?????...
by paperclip
Thu Sep 22, 2005 10:16 am
Forum: Cell Biology
Topic: fat cell
Replies: 18
Views: 11126

fat cell

i know the bits and pieces that go to form the lipid bilayer of a cell membrane. But what is the names of the bits and pieces ?of the bilayer? that keeps the cell membrane from dissolving into a heap of goo within and without? Cn't be phosphate and metal cations only.