AP Biology 2.5 Essential Life Process Information
AP Biology 2.5 Essential Life Process Information. What is the anticodon for the mRNA codon 5'AUG3'?
|AP Biology||Essential Life Process Information|
|Test Prep||AP Biology|
acid we’re talking about here… mRNA, otherwise known as messenger RNA.
So we know this is a DNA message that’s being sent out into the cell.
We also know that mRNA should try texting now and then…seriously, who leaves messages [mRNA texting as people laugh]
anymore…? Alright, well RNA is different from DNA in
a variety of ways – it’s single stranded, uses a different sugar in its backbone, and [DNA and RNA stood together]
it uses a different nitrogenous base. They also start with different letters…
Bet you didn’t have that difference on your list. That’s why they pay us the big bucks.
Instead of thymine, RNA uses a base called uracil.
So we can automatically eliminate A and C, as there’s no U for uracil to be seen. [Answers A and C crossed out]
That leaves us with two choices: to B, or not to B…or…to D…or…not…
You get the idea. Let’s take a look at the word anticodon. [Hammer slices word anticodon]
We see “anti” and “code”. What does that mean?
Basically, an anticodon is the opposite of what is being coded. So we need to find the
bases complementary to the ones being encoded by the mRNA. [tRNA molecules added to an mRNA strand]
Remember the base-pairing rules from DNA? A pairs with T and G pairs with C?
Now we’re in mRNA world, so A pairs with U and G…well, G isn't a fan of change. G
still pairs with C. More letters? And we were still wrapping our [Letters floating around mans head]
heads around the whole “R” and “D” difference…
So let’s just write down the opposite of what was coded, “AUG.” A goes with U,
U goes with A, and G goes with C. So the anticodon is UAC. You see?
Now for take two on that message…and we hope we get to finish, because this is important,
make sure you don’t open the–––– [man runs to telephone to answer the message]