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(no subject) [Mar. 6th, 2008|03:34 pm]
Biology Help

sarah1234567891
Express cells?


What are express cells?  I tried to google it but nothng.

cells expressing transporter 1.


What does that mean compared to another cell no expressing transporter 1?


thanks
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genetics of green eyes and heterochromia [Feb. 1st, 2008|01:23 pm]
Biology Help

heure_actuelle
is anyone familiar with the genetics of heterochromia?

here's my situation: my birth mom has brown eyes, and so do 2 of her 3 brothers. the 3rd brother has blue eyes. their dad had brown eyes, their mom green [hazel]. so since the 3rd brother has blue eyes, my grandpa must've been Bb, grandma Gb [am i correct with Gb? you almost never learn about the genetics of green eyes]

i know that green eyes are recessive to brown but dominant to blue so it would be possible for my birth mom and her 2 brothers to be BG, right? they have brown eyes but carry the green gene.

but here's the thing...my birth dad has blue eyes and i have one green eye one blue eye. is it possible my one green eye was passed from my maternal grandma? [i don't know anything about my dad's side of the family and their eye colors]. the more i think about it the more that doesn't make sense...if my birth mom is BG and my birth dad is bb then i would've been Gb, and since green is dominant to blue i'd have green eyes which i don't. so is it possible my grandma is gb, thus my birth mom is Bg and I am gb as well...? with my one green eye one blue eye. i know that's probably stupid but i don't know anything about heterochromia and am interested to find out how it works.

thanks if you read all this!
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(no subject) [Dec. 8th, 2007|04:15 pm]
Biology Help

volatile51
how would you name these compounds? http://img221.imageshack.us/img221/521/32128253xf3.jpg (sorry the drawings are so crappy...)

I think the 3rd is 2' UMP, the 4th is 5' TDP, and the 5th is cAMP (or would the correct way be 3' cAMP?) but I have NO idea what the first 2 would be... is the 2nd one just cytidine? The 2' OH on the first one confuses me like crazy... does it mean all the other sugars are deoxy? But I don't think that's the case... please help :(
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DNA Extraction [Dec. 5th, 2007|05:06 pm]
Biology Help

airpilot
So.. I did the lab on DNA extraction. Wooooo.... and now I'm confused on the discussion questions. Mainly:

If DNA is a rigid structure, why do the DNA strands appear flexible? What feature of the DNA’s structure account for its stiffness? If DNA is rigid, how does it coil tightly into a small space?


Well, I'm assuming the coil-into-small-space is because of histones/nucleosomes, but the rest I am not sure about.

Any help is appreciated? :)
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Hardy Weinberg with 3 alleles [Mar. 8th, 2007|10:56 am]
Biology Help

itcomesinpints
[Current Location |library!]

I'm trying to do a question about snail shell colours (thrilling I know) using Hardy Weinberg.

I know that for three alleles you use
p + q + r = 1
and
(p + q + r)squared = 1

The snails have brown shells (CB), pink shells (CP) or yellow shells (CY). B is dominant to P, which is dominant to Y.
In 500 snails there are brown: 236, pink: 231, yellow: 33.

I worked out that for brown shells the genotypes must be CBCB, CBCP and CBCY.
For pink shells the genotypes must be CPCP and CPCY.
For yellow shells the genotype must be CYCY.

I worked out that r squared is 33/500 = 0.066, giving r = 0.257.

My problem is that I can't see how to work out p or q... any help or pointers would be greatly appreciated =)
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Evolution implication [Dec. 4th, 2006|03:16 pm]
Biology Help

ilca
Hi. I need help with this question. Does the theory of evolution imply that life started by chance?

Here's some background info to put the question into perspective. I believe the world was created. I have a background in biology - I was a biology undergrad, but have since pursued a career in computers. I believe that the evolutionary process exists, maybe to a lesser extent than others on this community.

My intentions in asking this question are purely scientific. We can digress a little, but, please, let's not start a full blown evolutionist-creationist argument. Thanks.
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(no subject) [May. 2nd, 2006|07:27 pm]
Biology Help

ontheqt
hello-

which would be the climax community in a humid succession?

i circled lichens,mosses,ferns

here are the other choices:

a) large plants such as shrubs and trees

b) the pioneer community

c) small native plants

d) plants with high tolerance to full sun,limited water,limited nutrients


anyone have any ideas?


thanks.
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(no subject) [Apr. 15th, 2006|07:09 pm]
Biology Help

dr_weir_uk
[Current Mood |busy]

Hi does any1 know a good source for info on peptidyl synthase please? I looked everything but only found a line on it. I need least a paragraph on it for revision purposes, thx. :)

x-posted.
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Marine Biology Book [Mar. 22nd, 2006|04:44 pm]
Biology Help

kevinblanchard
I know this isn't specifically about zoology but I was trying think of a good book to recommend to a friend regarding Marine Biology. Other then maybe the text book I used (which wasn't all that great), what would be a good overview or "intro to" type book for Marine Biology? Ideally it would be something you'd read after you've taken your regular bio classes but similar material you'd cover in your first Marine Biology specific class. I am open to any other suggestions though? :)
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(no subject) [Mar. 18th, 2006|10:19 pm]
Biology Help

ontheqt
I can't find any direct info on this, maybe you guys can:

'In time, bread becomes stale and grows mold on the exposed surfaces. Why does mold not begin growing inside the bread loaf?

a. molds can only grown on dry surfaces.
b. only molds at the surface of the bread can get oxygen to respire.
c. mold actually begins from anywhere inside but produces colored spores only at the surface.
d. there is an antibiotic antagonism between the bread mold and the internal yeasts that made the breade rise.
e. the bread was sterilized when it was baked and thereafter mold spores setttle only on the outside of the cooled bread.

I was thinking c. but wasn't sure how to prove this.
the diagram in the book showed them growing out from within, but the text said it could be both ways.

thanks.
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