Biology - January 2007

i know its frowned upon and not legal but it can also cause mutations so why doesnt this happen with animals?

2007-01-11 08:07:54 · 15 answers · asked by fopodhater 1

Does anybody have good references (websites) with pictures of the pseudopupil?

2007-01-11 07:57:54 · 2 answers · asked by X 4

Human VNTR locus contains a tandem repeat of four nucleotides, (CGGT)n, where n may be any value between 7 and 22. How many different alleles of this locus would you expect to find in the human population? How many genotypes are possible?

2007-01-11 07:23:22 · 1 answers · asked by nick 1

some species of lungfish breathe only air; they have no gills, and will drown if forced underwater. why might it be an advantage for a lungfih to breathe air even though they live water????

2007-01-11 07:22:04 · 1 answers · asked by Anonymous

different races exist? surely the fact we all come from the same origions and yet aboriginees, europeans, africans and native americans differ in appearance from each other we have all evolved over 1000s or years to adapt to environment.

2007-01-11 06:58:07 · 14 answers · asked by fiddich59 2

2007-01-11 06:51:39 · 6 answers · asked by mahesh d 1

it seems like since amniotic cells are, for all intents and purposes, undefined. some small natural stimulation could be used to give it direction - that is, could growing naturally into the desired cell for whom the stimulus was designed. teaching the cells from their "undefined" point would then be key. bodily chemicals, neurotransmitters

2007-01-11 06:08:32 · 14 answers · asked by Kristen 1

If so, why? And, that's pretty cool when you think about it.

2007-01-11 05:42:44 · 13 answers · asked by Anonymous

that they'll evolve into humans, and we'll evolve into something else??

2007-01-11 05:39:05 · 32 answers · asked by Anonymous

2007-01-11 05:23:45 · 5 answers · asked by Janu 4

thank you

2007-01-11 05:11:33 · 9 answers · asked by SJ 2

i've search n search but cant seem 2 find da ansa

HELP!!!!

2007-01-11 05:09:45 · 1 answers · asked by SJ 2

How are the alveoli and the pulmonary capillaries arranged so that diffusion distances are at a minimum ?

2007-01-11 04:58:34 · 2 answers · asked by nargis 2

2007-01-11 04:47:56 · 4 answers · asked by Izzy 1

Name one place in the body where you would find a large quantity of:

a) Carbohydtrates
b) Proteins
c) Fats

Thanx

2007-01-11 04:40:22 · 4 answers · asked by SJ 2

what should i use for the cell membrane? help please

2007-01-11 04:22:12 · 5 answers · asked by mini 2

I am looking for definition, explanation and the concept of Competitive Exclusion Principle. I assure that It is related to biology but I know nothing about it.

2007-01-11 04:05:54 · 2 answers · asked by Impiger 4

2007-01-11 04:00:32 · 5 answers · asked by adam g 2

...if so how...?

2007-01-11 03:56:29 · 23 answers · asked by Anonymous

2007-01-11 03:46:11 · 2 answers · asked by Anonymous

2007-01-11 03:39:31 · 7 answers · asked by adam g 2

Can anybody help me with these questions for a review quiz. I couldnt find the anwers in my book.

1.Which of the following can regulate gene expression in eukaryotes?
A.lac operons
B.transcription factors
C.plasmids
D.lipids

2.Gene expression can occur at several points along the pathway from DNA to RNA to proteins. In one example of gene expression, the protein insulin must be trimmed to a smaller size. How is this is an example of gene expression?
A.Until the protein is trimmed, the shape of the DNA blocks transcription.
B.Until the protein is trimmed, transcription is blocked by a repressor protein.
C.Until the protein is trimmed, it is not useful to the cell.
D.Until the protein is trimmed, the ribosomes are not active.

3.If a cell loses control of gene expression, what happens?
A.The cell becomes more specialized.
B.The cell can carefully use its resources.
C.Healthy, mature cells develop.
D.Abnormal, unhealthy cells develop.

2007-01-11 03:00:42 · 4 answers · asked by .:AMIZZLE:. 3

2007-01-11 02:50:28 · 3 answers · asked by Paul H 2

2007-01-11 02:45:31 · 7 answers · asked by Jonathan 2

2007-01-11 02:44:16 · 2 answers · asked by mokona 2

2007-01-11 02:12:26 · 8 answers · asked by ashleigh b 1

2-3 sentences

2007-01-11 01:30:20 · 3 answers · asked by Ba'kon 1

2-3 sentences

2007-01-11 01:29:24 · 2 answers · asked by Ba'kon 1

The specific question was

How would one overexpress an important protein. Include the method used to enable rapid one-step purification.


My answer is

Isolote the gene encoding for the protein and ligate to His-tag. . Then clone modified gene into a LAC promoter in a bacterial artificial chromosome and tranform into E-coli, make sure the BAC has Ampicillin resistance gene. Then select for bacteria having Ampicillin resistance. intruduce lactose to induce LAC promoter. Then remove proteins and apply to affinity medium to which the HIS tag will bind and then wash to remove unwanted proteins. then elute wanted proteins using imidazole.

what do you think of my answer?

2007-01-11 01:02:00 · 3 answers · asked by nikos k 1

2007-01-11 00:45:48 · 4 answers · asked by sweet_andsimple23 1