Search found 106 matches

by AstraSequi
Wed Apr 25, 2012 8:49 pm
Forum: Microbiology
Topic: Just some ideas..
Replies: 1
Views: 2948

Re: Just some ideas..

I'm not sure what you mean by "to infect host cells but cause them to destroy infected cells and then erase themselves." In general, virus targeting is very specific, so you will not have to worry about infecting both the host and the target you want to destroy, unless the target is hiding...
by AstraSequi
Wed Apr 25, 2012 8:30 pm
Forum: Cell Biology
Topic: why the orientation of a protein in the plasma membrane?
Replies: 4
Views: 7654

Re: why the orientation of a protein in the plasma membrane?

Or if the function of the protein requires it to interact in a particular orientation with other proteins in the membrane. :)
by AstraSequi
Wed Apr 11, 2012 2:37 am
Forum: Microbiology
Topic: Porin-deficient mutant
Replies: 4
Views: 6119

Now suppose that the porin actually transports more than one substance - say, it can act on succinic acid as well as tetracycline. How might you figure out whether the porin is working or not? :)
by AstraSequi
Wed Apr 11, 2012 12:07 am
Forum: Human Biology
Topic: Heavy metals, can anyone answer?
Replies: 11
Views: 13520

(This post was partially written yesterday, but I didn’t finish writing it until after your latest post, so I’m not sure if it’s coherent. Please ask again if you have any questions.) A net charge (positive or negative) can be stored on your body, but it is neutralized by a flow of electrons ( not “...
by AstraSequi
Mon Apr 09, 2012 7:07 am
Forum: Human Biology
Topic: Heavy metals, can anyone answer?
Replies: 11
Views: 13520

The majority of all the molecules in your body are ions (all phospholipids, almost all proteins, ATP, NAD+...) Of course many of these would be affected by any toxin to some degree, but I can't think of any reason why their ionic state would be important for this. It is not as if the heavy metals co...
by AstraSequi
Sat Apr 07, 2012 6:44 am
Forum: Microbiology
Topic: Porin-deficient mutant
Replies: 4
Views: 6119

What is the function of a porin?

Knowing that, what sort of experiment might you design to see whether or not the porin is present? A system where the cell dies if the porin is not present (that is, the cell can't execute the porin's function) is usually very convenient.
by AstraSequi
Fri Apr 06, 2012 5:47 pm
Forum: Molecular Biology
Topic: DNA question help
Replies: 3
Views: 2564

So what would you expect to see? :)
by AstraSequi
Fri Apr 06, 2012 5:43 pm
Forum: Evolution
Topic: Evolution and hatchery populations
Replies: 5
Views: 4769

Sounds good, yeah. :)
by AstraSequi
Fri Apr 06, 2012 6:41 am
Forum: Evolution
Topic: Evolution and hatchery populations
Replies: 5
Views: 4769

The hatchery managers impose differential reproductive success on individuals within the population; three year old fish will have higher numbers of offspring. This sounds reasonable - the males that mature in three years will leave more offspring behind, and thus the population will shift to have ...
by AstraSequi
Fri Apr 06, 2012 6:26 am
Forum: Evolution
Topic: Just to clarify...
Replies: 2
Views: 2062

What specific question are you asking? In particular, what precise definitions for "evolution," "species," "proven," and "science" would you like to use?
by AstraSequi
Fri Apr 06, 2012 6:15 am
Forum: Molecular Biology
Topic: microRNA
Replies: 7
Views: 4418

I think that Wikipedia might be able to help you. :)

https://en.wikipedia.org/wiki/MicroRNA
by AstraSequi
Fri Apr 06, 2012 6:12 am
Forum: Cell Biology
Topic: Need Help
Replies: 2
Views: 2772

I'm not sure if this is the answer, but I know that some proteins can insert into membranes without help (or with the help of cytosolic proteins alone).