Homework help?

Question

Biology question- Suppose that a strand of DNA has the base sequence ATT-CCG. What is the base sequence of the complementary strand? I couldn't find this anywhere in my book.

Answer 1

Each type of base on one strand forms a bond with just one type of base on the other strand. This is called complementary base pairing. Here, purines form hydrogen bonds to pyrimidines, with A bonding only to T, and C bonding only to G. This arrangement of two nucleotides joined together across the double helix is called a base pair.

So with this you can easily figure out what the answer is

Answer 2

Remember that DNA for most organisms is double stranded and has polarity. This means that a complementary strand will be 'base-paired' with its partner in the reverse direction (antiparallel relationship). If your sequence is 5'-ATTCCG-3' then just pair the sequence with its reverse complement (The 5-prime and 3-prime ends suggest the polarity). The base-pairing relationship is A-T and C-G. So for your example, the correct answer would be :


5'-ATTCCG-3'
3'-TAAGGC-5'


This may be more complicated of an answer than you asked, but hope it helps! You should be able to base-pair any sequence you have now.

Answer 3

Just remember that each nucleotide has a complementary nucleotide. A and T are complementary and C and G are complementary.

for the sequence A_T_T the complement would be T_A_A.

Good luck!

Answer 4

TAA-GGC since dna does not have the codon U that is complementary to A in rna.

A's pair with T's
G's pair with C's

Answer 5

I think it is TTA-GGC because the DNA comes in a double helix structure and those 4 bases complement each other in DNA.

Answer 6

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Answer 7

Remember:
A-T
G-C

your strand.......: ATT-CCG
complementary: TAA-GGC

Answer 8

You should check your biology textbook's index for Chargaff's rule.
A->T and C->G
TAA-GGC