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Bases of DNA
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00:00 Speaker 1: All living things have something called DNA, deoxyribonucleic acid. The deoxyribonucleic acid is pretty much put together the same way, or it contains the same parts for all living things on earth. It contains a five-carbon sugar called deoxyribose, it contains a phosphate group, and the thing that makes it a little bit different is that it contains one of four different bases. And these right here, these are the four different nitrogenous bases that are available to DNA. They are adenine, which we always say is A; they are cytosine, which we classify as C; thymine, which we classify as T; and guanine, which we classify as G. 00:45 S1: Now, those are the four different bases that are available to DNA. And when these things are put together they combine in a specific way. A always matches with T. It doesn't matter if you're a bacteria or if you're a human or a giraffe or a pig, A always matches with T in DNA. So adenine always matches with thymine. In C, cytosine always matches with guanine. So C always matches with G. So when we form this double helix DNA of this twisted shape, A is always gonna match with T, and C is always gonna match with G. So that DNA not only that five-carbon sugar and that phosphate group, what really makes it the most important are these four different bases because the order of these four different bases, that's what determines your genes and that's how things are passed on from generation to generation.
Close
In a DNA molecule, T pairs with _______.
Responses
A AA
B CC
C GG
Question 2
There are ________ different bases of DNA.
Responses
A 22
B 44
C 66
D 88
Question 3
In a DNA molecule, C pairs with _____.
Responses
A AA
B GG
C TT
Answer all 3 questions correctly only using the responces provided
The correct answers using the given responses are:
Question 1: A (AA)
Question 2: D (88)
Question 3: B (GG)