Stupid Bio Question

[frogger33]

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Ok, so I took bio 6 years ago, and do not remember this. Can someone please remind me....

Is the order of DNA replication
1. Primase
2. DNA Polymerase 3
3. Helicase
4. DNA Gyrase
5. DNA Polymerase 1
6. DNA ligase

OR, does helicase occur BEFORE DNA polymerase since helicase unwinds and separates the strands (i.e. switch 2 and 3)

THANKS IN ADVANCE!! 🙂

 

[airvent]

Thats why you should not have sold back your Genetics Text book 😀

I would go check mine, but that would mean I would have to get up. so sorry.

 

[delicious]

Seems to me that helicase should come first in the whole list. But would you believe what I just said, and study from that? I mean DNA replication is a topic you should have in your study materials. I think that if you don't have the resources to find the answer for this, you might not be studying properly for the DAT. 😳

 

[Typo]

That's probably a little too much detail for the DAT. From what I understand, by far the most important things to know are that replication is 5'-3', DNA helicase unzips, DNA polymerase adds bases, and DNA ligase links together the Okazaki fragments. There are a few more details to know such as where it takes place, but the DAT just won't test on the level of detail you'll find in a textbook.

 

[Typo]

I think that if you don't have the resources to find the answer for this, you might not be studying properly for the DAT. 😳

Have you taken the DAT? Or are you being sarcastic again?

 

[psiyung]

That's probably a little too much detail for the DAT. From what I understand, by far the most important things to know are that replication is 5'-3', DNA helicase unzips, DNA polymerase adds bases, and DNA ligase links together the Okazaki fragments. There are a few more details to know such as where it takes place, but the DAT just won't test on the level of detail you'll find in a textbook.

👍

 

[delicious]

Have you taken the DAT? Or are you being sarcastic again?

Yeah, I've taken the DAT. And I wasn't being sarcastic at all. I now try to add (jk) or 🙄 after my sarcastic comments now.

I don't think that what frogger posted was too much detail; except the distinction between DNA Polymerase I and II (that's not important I think). If you understand DNA replication, you should be able to put that list together easily .

I just think that it's a little funny to be asking questions like that on an SDN forum. You should have that info in what you're studying. Myself, I wouldn't trust the responses on SDN for basic science facts. Now, if you had a question that was problem solving, or a little more complicated, then I would ask on SDN. That would be valuable, because you're not gonna find the reasoning to questions in any textbooks.

😀

 

[frogger33]

I was not asking to be judged by my questions. I understood that this was a place to ask questions!! Yes, I have taken the DAT once before and I am taking it again on Monday as I am waitlisted at my top choice school and the DAT is my biggest weakness (at least the math section), and so I am taking it again to see if I can get myself off the waitlist. Seeing that I have not taken a bio class in 6 years, I DO NOT HAVE ANY BOOKS!!! I thought it was a pretty general question that someone in a bio class might know off the top of their head, so I figured I would throw it out there. I got a 19 on my bio section the first time (not too bad) and I would just like to improve that score so I was trying to figure out some more detailed things. THANK YOU to those of you that were not sarastic and willing to help!!! 🙂

 

[delicious]

I was not asking to be judged by my questions. I understood that this was a place to ask questions!! Yes, I have taken the DAT once before and I am taking it again on Monday as I am waitlisted at my top choice school and the DAT is my biggest weakness (at least the math section), and so I am taking it again to see if I can get myself off the waitlist. Seeing that I have not taken a bio class in 6 years, I DO NOT HAVE ANY BOOKS!!! I thought it was a pretty general question that someone in a bio class might know off the top of their head, so I figured I would throw it out there. I got a 19 on my bio section the first time (not too bad) and I would just like to improve that score so I was trying to figure out some more detailed things. THANK YOU to those of you that were not sarastic and willing to help!!! 🙂

Who was being sarcastic?! Whatever, I felt I was trying to help in a round about way.

I know I'll just aggravate you more here frogger. But for everyone else : If you're studying from something that can't tell you that helicase will act before primase in the replication sequence, then what are you studying from? And what else is your study material leaving out that you should know for the bio section of the DAT? Asking questions on SDN is awesome, but it shouldn't be your primary source for basic science facts. I tried saying that before, but I guess it was misinterpreted as me trying to be mean.

But hey, whatever. I can see that my wisdom and experience is lost on most of you here. 🙄

 

[frogger33]

Who was being sarcastic?! Whatever, I felt I was trying to help in a round about way.

I know I'll just aggravate you more here frogger. But for everyone else : If you're studying from something that can't tell you that helicase will act before primase in the replication sequence, then what are you studying from? And what else is your study material leaving out that you should know for the bio section of the DAT? Asking questions on SDN is awesome, but it shouldn't be your primary source for basic science facts. I tried saying that before, but I guess it was misinterpreted as me trying to be mean.

But hey, whatever. I can see that my wisdom and experience is lost on most of you here. 🙄

No aggravation here! 😀
But I have been and did study from various DAT books, and none of them gave this info, so maybe it should be brought up with Barrons and Kaplan. 😉

 

[delicious]

No aggravation here! 😀
But I have been and did study from various DAT books, and none of them gave this info, so maybe it should be brought up with Barrons and Kaplan. 😉

Honestly, I can't see Kaplan having a section on DNA Replication (which they must) and not mentioning helicase, primase, and ligase. I specifically remember that the kaplan biology section in the DAT was exactly like the biology section for the MCAT. Can anyone confirm that the kaplan book doesn't mention those enzymes? I threw out my books long ago.

In my opinion, you should really know the order of these things. (except dist. between polymerase I and III).

1) Helicase
2) Primase
3) DNA polymerase III extends RNA primers
4) Later, DNA polymerase I excizes the RNA primers, & fills the gap
5) Ligase seals up nicks between okazaki fragments


Good luck on the DAT my friend.

 

[airvent]

Isn't there a break down of the DAT that tells you how many of each question there is on the exam?

I vaguely remember someone mentioning that there are only 2 or 3 genetics questions.