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Biology 12 Online
JoelTheBoss (joel_the_boss):

1+1=??

OpenStudy (anonymous):

11?

JoelTheBoss (joel_the_boss):

@bellablain @LunyMoony @nickmifsud1223

OpenStudy (bellablain):

2 lol

OpenStudy (anonymous):

900

JoelTheBoss (joel_the_boss):

Nick was right lol

OpenStudy (anonymous):

Yeah I'm always right.

OpenStudy (bellablain):

nope me

OpenStudy (anonymous):

bella why do you even try

OpenStudy (bellablain):

tell me this then nick, Why does DNA contain Thymine but RNA contains Uracil?

OpenStudy (anonymous):

u sux m8

OpenStudy (bellablain):

haha you know the asnwer?

OpenStudy (anonymous):

Yeah one sec.

OpenStudy (lunymoony):

2.2.2.2.2.2.2..2.2.2..2.2.22 ..... is za answer!

OpenStudy (bellablain):

lol

OpenStudy (anonymous):

There are four reasons for this: First, thymine is a methylated analogue of uracil, DNA can be protected from nuclei by methylation. Second, uracil has more base pair affinity to adenine, but it can also pair up with other bases including itself. This can lead to mutations in our genetic material. Third, repair enzymes find it easier to recognize the DNA if it is methylated. Fourth, uracil can also get converted or replaced by cytosine leading to mutations. Due to all these reasons our DNA is protected from mutations by methylation.

OpenStudy (anonymous):

wussup get rekt

OpenStudy (bellablain):

Cytosine in DNA spontaneously converts to Uracil about 130 times per day in every cell in your body. These spontaneous mutations must be recognized and repaired by DNA repair mechanisms to prevent these mutations from becoming permanent. IF DNA naturally contained Uracil, DNA repair mechanisms would not be able to distinguish between properly existing Uracils and those that resulted from the spontaneous conversion from Cytosine. Note: it takes a lot of energy and nutrients to make Thymine for use in DNA. It would be "cheaper" for cells to use Uracil in DNA, except for this nasty little problem of spontaneous cytosine to uracil mutations.

OpenStudy (anonymous):

I'm not gonna bother reading that.

OpenStudy (anonymous):

But i'm right. Like always.

OpenStudy (bellablain):

you get retkd lol

OpenStudy (anonymous):

I MEAN, WHO'S THE PERSON WITH THE MEDAL? ME

OpenStudy (bellablain):

false medalazation lol

OpenStudy (bellablain):

i gots to go

OpenStudy (lunymoony):

go where ?

OpenStudy (lunymoony):

@bellablain

JoelTheBoss (joel_the_boss):

bye :(

OpenStudy (lunymoony):

so easy to make joel cry

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