Nature Technology Corporation » rna

Bio help please?

NTC — Fri, 23 Jul 2010 17:47:59 +0000

Which of the following do not require an RNA primer before DNA replication
can occur?
A. prokaryotic chromosomes
B. eukaryotic chromosomes
C. bacterial plasmids
D. two of the above
E. none of the above

I think the answer is E but I’m not completely sure; can someone please help?
I am also having trouble with this one:
Beadle and Tatum won a Nobel Prize in 1944 for their "one gene – one protein"
hypothesis. Since then, which of the following discoveries is a contradiction of
the "one gene – one protein" hypothesis?
A. reverse transcription
B. alternate splicing
C. frame shift mutations
D. poly-A tailing
E. none of the above

Thank you!

Bio help please? is a post from: Nature Technology Corporation

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BIOLOGY: Transcription is the____?

NTC — Thu, 22 Jul 2010 19:01:25 +0000

a) manufacture of a strand of RNA complementary to a strand of DNA

b) manufacture of a protein based on info carried by RNA

c) modification of a strand of RNA prior to the manufacture of a protein

d) manufacture of a new strand of DNA complementary to an old strand of DNA

BIOLOGY: Transcription is the____? is a post from: Nature Technology Corporation

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Biology Help??? Please?

NTC — Sat, 19 Jun 2010 16:12:19 +0000

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.

Biology Help??? Please? is a post from: Nature Technology Corporation

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bio difficult please help?

NTC — Thu, 03 Jun 2010 19:54:29 +0000

Which of the following can regulate gene expression in eukaryotes?

a lac operons
b transcription factors
c plasmids
d lipids

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.

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.

bio difficult please help? is a post from: Nature Technology Corporation

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DNA won't dissolve after isolating! In both TE and nuclease-free water?

NTC — Thu, 03 Jun 2010 15:14:31 +0000

After I complete my DNA isolation, I find it very hard to dissolve the DNA pellet into solution. I performed a trizol isolation on HMVEC cells and I’ve tried using both TE and nuclease-free water to dissolve it, but neither works. I’ve also tried leaving it out overnight at room temperature, leaving it in 4* overnight and mixing, and have tried heating it. Anyone have any suggestions?
I know redoing it is probably the easiest way, but I’ve noticed this happens a lot during DNA isolation. I usually work with RNA and don’t have a problem, but DNA is tough. I only dry the vials for a couple of minutes after the ethanol step so that the pellet doesn’t over-dry, but I keep getting the same result.

DNA won't dissolve after isolating! In both TE and nuclease-free water? is a post from: Nature Technology Corporation

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Joined pieces of DNA that act like a single DNA molecule are known as?

NTC — Sat, 29 May 2010 14:59:19 +0000

A. plasmids.
B. mutations.
C. recombinant DNA.
D. recombinant RNA.

Joined pieces of DNA that act like a single DNA molecule are known as? is a post from: Nature Technology Corporation

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Biology….. meanings, help pls…?

NTC — Tue, 25 May 2010 16:32:44 +0000

i have a test tommorow and i cant figure out the right answer in my reviewer. pls help me. complete explainations will be greatly appreciated. thanks
what is a/ are:

1. spindle fibers
2. genome
3. euchromatin
4. macromolecule
5. Down’s Syndrome
6. proteinsynthesis
7. RNA ( ribose nucleic acid)
8. plasmids
9. restriction nucleases
10. Lamarck’s theory of evolution
11. vectors
12. species selection
13. gene theraphy
14. australopithecus
15. foraminiferans and sacrodes
16. what serve as a genetic material of a virus?
a) DNA b.) RNA
17. carrageena
18. arthropods
19. Global wwarming
20. biological magnification

thank you..

Biology….. meanings, help pls…? is a post from: Nature Technology Corporation

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biology question 10 points?

NTC — Mon, 17 May 2010 00:52:24 +0000

Which types of metabolic activity are found in prokaryotes?
I. Fermentation
II. Nitrogen fixation
III. Photosynthesis
A. None
B. I only
C. I and II only
D. I, II and III

In what way are eukaryotic chromosomes different from prokaryotic chromosomes?
Eukaryotic chromosomes Prokaryotic chromosomes
A. Protein is present Protein is absent
B. DNA is present DNA is absent
C. RNA is present RNA is absent
D. RNA is absent RNA is present

14. What are the final products when a diploid onion cell, containing 16 chromosomes undergoes
meiosis?
A. 4 cells, each with 8 chromosomes
B. 2 cells, each with 8 chromosomes
C. 4 cells, each with 4 chromosomes
D. 2 cells, each with 16 chromosomes

15. Which processes result in the greatest amount of genetic variation in a population?
A. Natural selection and meiosis
B. Meiosis and mutation
C. Mutation and mitosis
D. Mitosis and natural selection

21. Which equation should be used to calculate the mean of a set of values?
A. lowest value (highest + value − lowest value)
2
B. (highest value − lowest value) ± 68%
2
C. total of all values
number of values
D. number of values
total of all values
×100%

biology question 10 points? is a post from: Nature Technology Corporation

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Is there a different type of primer i have to use when running PCR with genomic DNA compared to cDNA?

NTC — Thu, 29 Apr 2010 05:15:38 +0000

Im still in school but when i run a PCR, I normally isolate RNA first then RT to cDNA and run PCR with that. This time i isolated the genomic DNA from the sample and ran PCR using the beta-actin primer i always used. Dimers were faintly visible on my gel but nothing really came up like it normally would have or should have. I was told that when running PCR with genomic DNA, a different kind of primer had to be used; one that is specific to genomic DNA. Im confused as to why it would matter or if it matters at all.

Is there a different type of primer i have to use when running PCR with genomic DNA compared to cDNA? is a post from: Nature Technology Corporation

Technorati Tags: beta actin, dimers, genomic dna, pcr, rna

What is one of the roles of DNA polymerase during replication?

NTC — Wed, 14 Apr 2010 23:38:23 +0000

A.It unzips molecules of DNA.
B.It “proofreads” each new DNA strand.
C.It degenerates the old DNA strand.
D.It uses one strand of DNA to build a strand of RNA.

What is one of the roles of DNA polymerase during replication? is a post from: Nature Technology Corporation

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