Dna

Started by Mstoothlady2012
This forum made possible through the generous support of SDN members, donors, and sponsors. Thank you.
Mstoothlady2012

Mstoothlady2012

Full Member
10+ Year Member
5+ Year Member
15+ Year Member
Advertisement - Members don't see this ad
Someone already posted this question before and klutzy gave good explanation but I still don't understand. What is the key word we are looking for in order to differentiate between these two questions? Also DNA molecule = double helix of DNA right?

If a strand of DNA underwent four rounds of replication, what percentage of the total DNA present would be comprised of original DNA molecule?

Consider a sample of DNA that undergoes four rounds of replication. What percent of DNA produced contains part of the original-stranded DNA?

Thanks!
 
Sort by date Sort by votes
Yeah I dont know what the difference is. Are these two questions somewhere I could look up and see how the answers differ? Like destroyer, cliffs, kaplan?
 
Upvote 0 Downvote
Mstoothlady2012 said:
Someone already posted this question before and klutzy gave good explanation but I still don't understand. What is the key word we are looking for in order to differentiate between these two questions? Also DNA molecule = double helix of DNA right?

If a strand of DNA underwent four rounds of replication, what percentage of the total DNA present would be comprised of original DNA molecule?

Consider a sample of DNA that undergoes four rounds of replication. What percent of DNA produced contains part of the original-stranded DNA?

Thanks!
Click to expand...

OHHH i think i get it!!! is the first one 6.25% and the second one 12.5%???
 
Upvote 0 Downvote
Advertisement - Members don't see this ad
thats what i got too...i did it so a strand of DNA was just 1 strand and replicated that 4 times

l-->ll--> ll ll--->ll ll ll ll--->ll ll ll ll ll ll ll ll 1strand/16 strands=.0625

and for the second one i thought of a sample of DNA as a double stranded molecule and did pretty much the same thing except started with 2 strands and came up with 2strands/32strands= .0625

are these answers right?
 
Upvote 0 Downvote
Advertisement - Members don't see this ad
osimsDDS said:
I am actually gonna change my answer:

1) 12.5%
2) 6.25%

My reasoning is because the first one asks for total DNA and the second you just divide the total by 2 because it asks for how much contains...
Click to expand...


II
II II
II II II II
II II II II II II II II
1/8 is 12.5

and the second one is:
100 --50 -- 25 -- 12.5 -- 6.25

so this is what you are saying??
 
Upvote 0 Downvote
Mstoothlady2012 said:
Someone already posted this question before and klutzy gave good explanation but I still don't understand. What is the key word we are looking for in order to differentiate between these two questions? Also DNA molecule = double helix of DNA right?

If a strand of DNA underwent four rounds of replication, what percentage of the total DNA present would be comprised of original DNA molecule?

Consider a sample of DNA that undergoes four rounds of replication. What percent of DNA produced contains part of the original-stranded DNA?

Thanks!
Click to expand...

Ok i think i understand this now let me explain:

when they say the total DNA they mean strand for strand and when they say DNA produced they mean every DNA which consists of 2 strands...so total DNA strand for strand would be out of 32 and DNA produced (every 2 strands) would be 16 because for every 2 strands we have 1 DNA...so basically 2/16= 12.5% and 2/32= 6.25%

So second one should be 12.5% and first should be 6.25%
 
Upvote 0 Downvote
sorry for the delayed response..

1st one is from kaplan subject test # 5 Q 3 <--- 6.25%
2nd one is from destroyer - # 237 <--- 12.5%

How????????? Every1 gave different answers. only osims got it right but you didn't explain why? klutzy where r u?????? :-(
 
Upvote 0 Downvote
osimsDDS said:
Ok i think i understand this now let me explain:

when they say the total DNA they mean strand for strand and when they say DNA produced they mean every DNA which consists of 2 strands...so total DNA strand for strand would be out of 32 and DNA produced (every 2 strands) would be 16 because for every 2 strands we have 1 DNA...so basically 2/16= 12.5% and 2/32= 6.25%

So second one should be 12.5% and first should be 6.25%
Click to expand...
still dont understand.....
 
Upvote 0 Downvote
yeah I had them backwards, Dr green explanation is great.

Mstooth, if it has total then they are talking about strands, at least that's how I'm reading it.
 
Upvote 0 Downvote
Advertisement - Members don't see this ad
osimsDDS said:
check out Dr. green's explanation its pretty nice with drawing and everything!!! haha
Click to expand...
yea i can totally answer the question right if it had said something like...

If a DNA molecule underwent 4 round of replication what percent of strands would have the original DNA? 2/32 = 6.25

If a DNA molecule underwent 4 round of replication what percent of DNA contains original DNA? 2/16 = 12.5

But the questions aren't these clear...nowhere in the question it differentiate if we are looking for the # of strands or # of DNA molecule at the end. Only at the beginning of question 1 they use word strand but that doesn't even indicate anything.
 
Upvote 0 Downvote
Mstoothlady2012 said:
yea i can totally answer the question right if it had said something like...

If a DNA molecule underwent 4 round of replication what percent of strands would have the original DNA? 2/32 = 6.25

If a DNA molecule underwent 4 round of replication what percent of DNA contains original DNA? 2/16 = 12.5

But the questions aren't these clear...nowhere in the question it differentiate if we are looking for the # of strands or # of DNA molecule at the end. Only at the beginning of question 1 they use word strand but that doesn't even indicate anything.
Click to expand...

i know i find it pretty ridiculous...but wut can we do :scared:
 
Upvote 0 Downvote
You must log in or register to reply here.

Similar threads

capt34500
  • Question Question
Does DNA Ligase ligate the replaced RNA Primer and the leading strand in DNA Replication
Replies
5
Views
4K
Daniel Schruth
Daniel Schruth
F
  • Question Question
What is the correct answer? Bio and DNA
Replies
4
Views
1K
DAT Destroyer
DAT Destroyer
virtualmaster999
  • Question Question
"DNA strand with most nucleotides"
Replies
2
Views
2K
virtualmaster999
virtualmaster999
G
  • Question Question
"DNA polymerase works in the ___ direction"
Replies
4
Views
4K
dent_gent
D
virtualmaster999
  • Question Question
Percentage of Original DNA genetics question
Replies
7
Views
1K
virtualmaster999
virtualmaster999