If the sequence of nucleotides in one chain of DNA molecule is T-C-A-A-G-C...............................?

Question

If the sequence of nucleotides in one chain of DNA molecule is T-C-A-A-G-C, a new nucleotide chain will be produced during replication with the complementary sequence:
a. T-C-A-A-G-C
b. A-G-T-T-C-G
c. C-T-G-G-A-T
d. G-A-C-C-T-A









please help me with this. please explain to me how you got it in a short summary. Oh, and tell me the answer too.

for example: a. T-C-A-A-G-C

because sometimes people explain to me how they got the answer, but they never tell me what the answer is.

THANKS TO EVERONE THAT PUT SOME EFFORT INTO THIS QUESTION AND TOOK THE TIME TO HELP ME OUT.

Answer 1

Remember that the 2 complimentary strands are antiparallel. That is to say that the 2 strands although complimentary run in opposite directions.

It's useful to assign an order to the strand by referring to the directon of the strand. This is generally done by writing 5' in front of the sequence, in this case TCAAGC, thus 5' TCAAGC.....
The 5' refers to the position at which the Phosphate group is attached to the ribose component of the DNA molecule.

So the answer to your question of what is the complimentary sequence to 5' TCAAGC....? It's 5' ......GCTTGA. (the answer you have for letter "b" written backwords.

Answer 2

The polymerase chain reaction (PCR) is a medical technique in molecular biology to boost a unmarried or few copies of slightly of DNA throughout the time of a number of orders of value, generating 1000's to 1000's of thousands of copies of a particular DNA series.

Answer 3

remember your letters

A : T
C : G

so simply replace the original nucleotides with their opposites:

original = T C A A G C
complimentary = A G T T C G

I would look up the differrences between the nucleotides - this may explain why they need to match up this way.

Answer 4

What if the if the left chain of a DNA molecule has the nucleotide sequence CCGTAGGCC,what is the sequence of the right chain of the DNA molecule?

Answer 5

Match the AT and CG. I tell my students to match the letters with straight lines (A T) and to match the letters with curves (C G). And this is so easy that you can get your own answer.