Search found 11 matches

by SysBio
Fri Jan 27, 2012 9:03 pm
Forum: Cell Biology
Topic: Female XX genotype gives advantage for genetic disorders?
Replies: 1
Views: 2824

Female XX genotype gives advantage for genetic disorders?

Hello, I have read that since females have an XX genotype, they have an advantage over males' XY genotype for some genetic disorders. If the female has a recessive allele on one X chromosome it may be covered by a dominant allele on the other X chromosome....but in males, any recessive allele on the...
by SysBio
Tue Jul 07, 2009 11:26 pm
Forum: Human Biology
Topic: Flu symptoms...sympathetic or parasympathetic?
Replies: 1
Views: 3028

Flu symptoms...sympathetic or parasympathetic?

Are the responses to pathogen invasion (eg. increased body temperature) initiated by the sympathetic nervous system OR the parasympathetic nervous system? I would guess that it would be parasympathetic ("rest and digest")...but on the other hand, I could see how it could be a sympathetic (...
by SysBio
Tue May 26, 2009 7:36 am
Forum: Microbiology
Topic: Viral Enzymes
Replies: 2
Views: 9966

Viral Enzymes

(I posted this in the Cell Biology forum but did not get a response, so I am re-posting this here ) For the viruses that must carry a specific enzyme (eg. viruses with ssDNA, -ssRNA genomes): 1. It is carried in the capsid AND coded for in their genomes, right? 2. since they need this enzyme before...
by SysBio
Mon May 25, 2009 12:47 am
Forum: Cell Biology
Topic: Viral Enzymes
Replies: 1
Views: 1408

Viral Enzymes

For the viruses that must carry a specific enzyme (eg. viruses with ssDNA, -ssRNA genomes):

1. It is carried in the capsid AND coded for in their genomes, right?

2. since they need this enzyme before they can use their genome, how do they ensure that a lot is transcribed?

Thanks in advance...
by SysBio
Fri Mar 27, 2009 3:40 am
Forum: Molecular Biology
Topic: DNA ligases
Replies: 1
Views: 2452

DNA ligases

After you "cut" DNA fragments using restriction enzymes, and then are "pasting" them together using DNA ligase...

do you need to select a specific DNA ligase that matches with the specific restriction enzyme that was used?
by SysBio
Thu Mar 26, 2009 10:52 am
Forum: Cell Biology
Topic: Interphase - diff between G1 and G2?
Replies: 3
Views: 12899

Re: Interphase - diff between G1 and G2?

Ok I think I figured it out... During G1, the cell makes dNTPs in preparation to be used during the S phase (DNA replication). In G2, I think these pathways are turned off. So to sum up: The cell is always making RNA and protein (ie. always doing transcription and translation). But DNA is replicated...
by SysBio
Thu Mar 26, 2009 2:36 am
Forum: Cell Biology
Topic: Interphase - diff between G1 and G2?
Replies: 3
Views: 12899

Re: Interphase - diff between G1 and G2?

Thanks for the reply...

So then the same processes would be occuring in the G1 and G2 states then? But in G2 cells, the nucleus would contain a duplicated genome?
by SysBio
Wed Mar 25, 2009 6:32 am
Forum: Cell Biology
Topic: Interphase - diff between G1 and G2?
Replies: 3
Views: 12899

Interphase - diff between G1 and G2?

I have commonly read: G1: cell grows S: DNA replication G2: replicate organelles However, If you look at 1:20 of this short clip: http://www.youtube.com/watch?v=lf9rcqifx34 It says something like "the difference between G1 and G2 is that; G1 produces DNA and protein, but G2 produces RNA and pro...
by SysBio
Mon Mar 23, 2009 3:15 pm
Forum: Microbiology
Topic: Anaerobic bacteria in wounds
Replies: 3
Views: 4741

Re: Anaerobic bacteria in wounds

makes sense....basically: wounds become poorly oxygenated environments

thanks for the replies
by SysBio
Sun Mar 22, 2009 4:57 am
Forum: Microbiology
Topic: Anaerobic bacteria in wounds
Replies: 3
Views: 4741

Anaerobic bacteria in wounds

I read somewhere that anaerobic bacteria are commonly found to infect wounds.

Can someone explain why that is? I didn't think that blood was a super anaerobic environment...ie. dont the red blood cells carry oxygen?
by SysBio
Tue Jan 22, 2008 12:01 pm
Forum: Microbiology
Topic: Virus and Energy?
Replies: 10
Views: 16456

Re: Virus and Energy?

I just read an article on the thermodynamics of cellular systems (can't remember where) - at the moment, the mechanisms of classic thermodynamics can't be translated to cells, so at the moment we can't be completely sure that big machines are analogous to little biological ones. Darby if you recall...