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Ch.4 - Nucleic Acids and the RNA World
All textbooksFreeman 8th EditionCh.4 - Nucleic Acids and the RNA WorldProblem 6
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Chapter 4, Problem 6

If nucleotides from the DNA of a human were quantified and 30 percent of them contained the base adenine, what percentage of them would contain the base guanine? a. 20 percent b. 30 percent c. 40 percent d. 70 percent

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Hello everyone here's our next problem. It says the% identified. The incorrect statement. Well when we talk about the percent of a kind of base in D. N. A. Of a species, what we can recall that we're looking for is char gaffes rule. As that's the rule we have that deals with the percent of a base in DNA of a species. And it says in any species that percent of adnan must equal the percent of timing. And likewise the percent of Cytisine must equal the percent of guanine. And we also have along with that that there's a 1-1 ratio. That's a ratio ratio of pure ing's two parameter means our perimeter. Excuse me. And we can recall that the purity rings are the bases that have a two ring structure and that's A N. G. And the perimeter means have a single ring structure and that's T. And C. So the periods and permitting must be in a 1-1 ratio. So let's look at our answer choices remembering that we're looking for the incorrect statement. So choice a says the number of primitive bases must be 5050%. Well, we know that permitting appearance must be in a 1-1 ratio. So if the total number of bases is 100% 50% must be perimeter things. So this is a true statement and therefore not our answer. Since we're looking for an incorrect statement. Choice B says the amount of side a scene must be greater than adami. So let's look at Argus rule to determine how much citizen we must have. Well, we know that the amount of Adnan is And therefore finding must also be 30%. So together that makes them about 60 of the bases in our sheep DNA. So therefore the remaining bases must make up the other 40%. Well, if of those two C and G must be must be present in equal percentages. Well divide 40% by two and there must be 20% each of C. And G. So when we look at the amount of Cytisine, we have 20% Adnan 30%. So the amount of Cytisine is less than the amount of Adnan. So this statement in B is false and therefore that's where the answer we're looking for. Choice B. To be thorough will go through the other two choices. So choice C says the amount of guanine will be 20%. Well, we calculated that and indeed 20% of the D. N. A. Is guanine. So that is true and choice C. Is not our answer. And finally the sum of C. Plus finally, Choice D. Says the sum of C plus G must be 40%. And we calculate that over here. That is indeed 40%. So this is a true statement. So Choice D also not our answer. So the incorrect statement. If the percent of Adnan in the DNA of sheep is 30% is choice be the amount of citizen must be greater than Adnan. See you in the next video.
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