AP Biology 2.4 Essential Life Process Information
AP Biology 2.4 Essential Life Process Information. What does helicase do?
|AP Biology||Essential Life Process Information|
|Growth, reproduction, and maintenance||Systems require energy input|
|Test Prep||AP Biology|
Okay, first things first – whenever you see something ending in “ase”––that’s
a-s-e––in biology land, an alarm bell should go off in your head. [alarm bell sounding in a persons head]
…Maybe not an alarm bell.
Maybe just a “ding” or something. [a hand ringing a bell on someones head]
Either way, whenever you see something ending in “ase,” it’s probably an enzyme.
And usually, you can figure out what the enzyme’s job is by what comes before the “ase.” [enzyme looking for food]
For example, DNA polymerase adds the new bases to the DNA when the DNA is being copied. [DNA polymerase DJ'in at a club]
Which is basically just a fancy way of saying synthesizes, which is basically a fancy way
of saying we can eliminate B. Likewise, DNA ligase is the enzyme that ligates, [DNA ligase trying to stick two DNA fragments together]
or glues together, fragments of DNA.
Though we’re pretty sure a glue stick would do the trick, too.
So it’s not C. That leaves us with A and D.
The structure of DNA is a double helix. [A DNA double helix structure]
And if we take a look at the word in question…heli…case…
Probably has something to do with a helix, right?
Ding, ding, ding. [hand ringing a bell]
…Way more pleasant than an alarm, right?
Helicase is the enzyme that unwinds and separates DNA strands. Bit like when your mom does that with your socks.[Helicase unwinding the DNA helix and Mom unwinds socks]
Which means A is our answer.
And if you’re having trouble keeping that in mind, just remember: helicase is the enzyme
that unzips your genes. [Boys jeans unzip and people laugh]
Little forward of it, don’t you think?