What are the DNA complement base pairs for this strand of DNA? 5’ AGTTTA 3’

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First, recall the base-pairing rules in DNA: Adenine (A) pairs with Thymine (T), and Cytosine (C) pairs with Guanine (G). Also remember that DNA strands are antiparallel, so the complement strand runs in the opposite orientation.

Option a: 3’ CTGGGG 5’
This sequence does not match the expected complement. Checking base pairs against 5’ AGTTTA 3’: A would pair with T, but here the first base on the 3’ end is C, which would pair with G on the original strand, not T. Therefore this option is incorrect.

Option b: 3’ TCAAAT 5’
This aligns with proper base-pairing. Going from the original 5’ AGTTTA 3’:
- A pairs with T, giving T on the 3’ end side.
- G pairs with C, giving C next.
- T pairs with A, giving A next.
- T pairs with A, giving A next.
- T pairs with A, giving T at the terminal 5’ end location.
Thus the complement is 3’ TCAAAT 5’, which fits the antiparallel orientation and base-pair rules.

Option c: 3’ TCUUUT 5’
This option includes letter U (uracil), which is a RNA base, not a DNA base. Since the question specifies DNA, using U is inappropriate. Additionally, the sequence does not reflect correct A-T and C-G pairing as seen in the other options. Therefore this is incorrect.

In summary, only option b follows the correct DNA base-pairing rules (A↔T, C↔G) and the expected antiparallel orientation for the given strand.

ANTH 246 OL2 SP25 Week 3 Lecture

What are the DNA complement base pairs for this strand of DNA? 5’ AGTTTA 3’

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