Question

Which of the following statement is true concerning the sequence pTACGTAACGTA?

A. This is an RNA sequence
B. In order to have a more rigid structure in a double-stranded molecule, the sequence given would need more adenosine
C. If the complementary strand were present, the number of purines would be equal to the number of pyrimidines
D. The amount of purines is equal to the amount to pyrimidines

Answer 1

the only correct is C, If the complementary strand were present, the number of purines would be equal to the number of pyrimidines.

Step-by-step explanation:

You must always remember that in nucleic acids the rule of base complementarity is met. Whenever there is a puric base, there will be a pyridine in the complementary strand.

The purines are A and G

The pyridunas are C and T

Possible unions are A - T or C - G.

In the sequence TACGTAACGTA there are 6 purines and 5 pyridines.

When you see the complementary chain: ATGCATTGCAT, there are 6 pyridines and 5 purines.

As you can see, as long as there is a double chain, for each purine, there will be a pyridine on the other side.