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The 4 bases are adenine, thymine, cytosine, and
guanine, right? But, what are purines and what are pyrimidines?
You ask a great question.
Purines are the bases that have two rings (adenine and guanine) while
pyrimidines are the bases that have only one ring (cytosine, uracil, and
thymine). There are other purines and pyrimidines besides the ones
that are used for DNA and RNA. These others do other functions in the
cell and in the body.
Thanks for a great question !
is bacteria? Just want to know.
A bacterium (plural is bacteria), is a single cell organism. That means
that this type of living creature is composed entirely of one cell. Your
body has trillions that all work together so you can walk and talk and
think. Bacteria, being so small, can still do remarkable things....Like
swim to a specific location and grow and divide to make more bacteria just
like him. When scientists through the years have discovered more and more
about the world around us, they first try to categorize things. Bacteria
are the category that the old time scientists gave to all the millions of
different kind of single cell living creatures.
teach High School biology and anatomy/physiology. A student asks if uracil
is always substituted in RNA? I'm unsure if it is 100% of the time. Can you
You must thank your student for their most excellent question.
Messenger RNA does not contain Thymine base, only Uracil. But, with
transfer RNA, things get a bit more complicated. Evidently, tRNA
contains up to 10% of its total as minor or odd bases. This includes
ribothymidylic acid, which is the ribose version of deoxy-ribo-thymidine
found in DNA. Other minor bases include the methylated versions of A,
C, G, and U.
Ribosomal DNA, as best I can find, contains minor amounts of the methylated
A, C, G, and U bases. If and when I should run across a theory as to
what purpose these base substitutions fulfill, I will pass that along. Maybe
your student can become a researcher and figure it out themselves.
Thanks for the question.
was wondering if you could send me information on the DNA sequence of the
genes on chromosome 19, also what the function is of each gene and what they
are responsible for determining?
Thank you, Loryn
The human genome project is unraveling just this sort of information. Their
information can be found at:
was wondering if I can get a clone? I always wanted a twin. I
wonder if scientists can test it out on me? If someone gets a clone
does it cost money??? If they do an experiment on a human, I'll be the
one to test on.
or worse, scientists can not yet clone human beings. And, if they
could, she would be a baby version of you, not your age.
Thanks for asking,
Learn more! Google:
cell science projects
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