Search found 4 matches

by dawn1070
Thu Jun 17, 2010 2:29 am
Forum: Molecular Biology
Topic: Prosthetic groups
Replies: 1
Views: 2220

Prosthetic groups

What are prosthetic groups and why are they necessary? I understand that they are non polypeptide structures (usually inorganic metals) that are tightly bound and key for the activity of an enzyme or other protein. Essentially they are cofactors. But why are they necessary for the function of an enz...
by dawn1070
Wed Jun 16, 2010 8:06 am
Forum: Genetics
Topic: Questions re crossing over and histones
Replies: 3
Views: 2884

Re:

histones probably evolved later. However, to my knowledge, they have some histone-like proteins. You could have also double crossing-over. Or crossing-over on other chromosome I'm looking at the question now and it is asking for a single crossing over event. What do you mean by crossing over on oth...
by dawn1070
Wed Jun 16, 2010 6:41 am
Forum: Genetics
Topic: Questions re crossing over and histones
Replies: 3
Views: 2884

Questions re crossing over and histones

A question I encountered is asking to demonstrate using a diagram of a bivalent of the F1 progeny with a single crossing over event causing all the produced gametes to be parental? I don't get how this works because I thought crossing over would have resulted in recombination no matter what? Also wh...
by dawn1070
Wed Jun 16, 2010 6:38 am
Forum: Cell Biology
Topic: Membrane fluidity
Replies: 3
Views: 33726

Membrane fluidity

What are 4 factors that affect membrane fluidity? I've looked in a textbook and haven't been able to find 4. However, so far I've been thinking: presence of cholesterol, temperature, composition of phospholipids (i.e. degree of saturation) and presence of membrane proteins/carbohydrates? Not sure ab...