What is the complementary base sequence of the dna strand if the template strand reads ttgcacg? a. cctatgc b. ttgcggc c. aacgtgc d. ggtacta

C

Explanation:

Complementary base pairing describes the manner in which the nitrogenous bases of the DNA molecules align with each other. Complementary base pairing is responsible for the double-helical structure of DNA.

DNA, or deoxyribonucleic acid, is a molecule that stores all of the genetic information of an organism. DNA is a polynucleotide made of the many smaller subunits called nucleotides. There are four different kinds of nucleotides that make up DNA, each with one of four possible nitrogenous bases: adenine (A), cytosine (C), guanine (G) and thymine (T). Since a DNA consists of a combination of these four nucleotides, a DNA molecule can read ACTTGATTCT (polynucleotide).

These bases can be divided into two categories: purine bases and pyrimidine bases.

Adenine and guanine are examples of purine bases.

Thymine and cytosine are examples of pyrimidine bases.

Complementary base pairing is the phenomenon whereby DNA guanine (G) always form hydrogen bonds with cytosine (C) and adenine (A) always binds to thymine (T). Chargaff's rule, also called complementary base pairing rule, states that DNA base pairs are always adenine with thymine (A-T) and cytosine with guanine (C-G). A purine always pairs with a pyrimidine and vice versa. However, A doesn't pair with C and G doesn't pair with T.

In this case, a DNA strand reading TTGCACG will have a complimentary base pairing of AACGTGC.