Write the complementary sequence of bases for each DNA strand shown next.
a. 5′T-A-T-A-C-T-G 3′

Question

Write the complementary sequence of bases for each DNA strand shown next.

a. 5′T-A-T-A-C-T-G 3′

Accepted Answer

All right. Hello everyone. So this question is asking us what is the complementary nucleotide sequence that pairs with each base on the DNA strand? Five prime CGT AC G three prime. And here we have four different answer choices labeled A through D. So recall first and foremost that DNA and RN A for that matter are nucleic acids and nucleic acids are polymers. Their monomers are known as nucleotides. Now nucleotides have multiple components to them, but one such component that's relevant for this question is known as the nitrogenous base. So it's the nitrogenous base of sugar and a phosphate group that make up each nucleotide. Now, the bases themselves are different and those are what distinguish one nucleotide from the other. So the reason why these bases are so important, especially in DNA is because these bases when they are complementary, can hydrogen bond with each other. So if we take two strands of DNA, for example, one strand runs in the five prime to three prime direction and the other runs in reverse from three prime to five prime in between both bases or excuse me in between both strands of DNA lie the nitrogenous bases. And so when the bases hydrogen bond with their complement, that is going to stabilize the double stranded DNA structure and eventually result in the characteristic double helix. So when talking about DNA specifically recall that adenine hydrogen bonds with thymine and cytosine hydrogen bonds with guanine. When talking about RN A adenine would bind to il instead. So based on this relationship, we can figure out the complementary strength. So the strain that we're given is running from five prime to three prime, which means that the other strand which is the one that we are looking for. In this case, is running from three prime to five prime. And you can see here that all of our answer choices run from three prime to five prime. So from here, all we would have to do is recall these complementary base pairs. For example, our first base in the given strand is cytosine, which means that guanine must be its complement. The second is guanine which means cytosine must be its complement. The third is thymine. So Adenine compliments it. The fourth is Adenine, which means that thymine complements it up. Next is satine. So it's guanine pairing with it after that is guanine, which means cytosine pairs with it. And last but not least we have Adenine in the original strand, which means that thymine is its complement and there you have it. So here our final answer is going to be option A in the multiple choice because the complementary nucleotide sequence from three prime to five prime is GCAGCT. And so with that being said, thank you so very much for watching. And I hope you found this helpful.

Write the complementary sequence of bases for each DNA strand shown next.
a. 5′T-A-T-A-C-T-G 3′

Verified video answer for a similar problem:

Key Concepts

DNA Structure

Complementary Base Pairing

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Write the complementary sequence of bases for each DNA strand shown next.a. 5′T-A-T-A-C-T-G 3′

Verified video answer for a similar problem:

Key Concepts

DNA Structure

Complementary Base Pairing

5' and 3' Ends of DNA Strands

Write the complementary sequence of bases for each DNA strand shown next.
a. 5′T-A-T-A-C-T-G 3′