NEET BIOLOGY

CELL STRUCTURES AND FUNCTION

CELL CYCLE

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

If one strand of DNA has the sequence GCCATT, what would you expect to be the sequence on the opposite strand?

A	GCCATT
B	CGGTAA
C	TTACCG
D	AATGGC

Explanation:

Detailed explanation-1: -The base pairs on one strand of the DNA bind with the base pairs of the other strand specifically. A always pairs with T with two hydrogen bonds and G always pairs with C with three hydrogen bonds. So if one strand is ATGCTTGA then the complementary strand will be TACGAACT.

Detailed explanation-2: -So, in translation, adenine turns into thymine, and guanine turns into cytosine, and vice-versa. So, the complementary side would read TACGGCA .

Detailed explanation-3: -A strand of DNA with the sequence AACTTG will have a complimentary strand with the sequence. Explanation: There are four nitrogenous bases. They help in relation of one of the strand of the DNA with the others strand.

Detailed explanation-4: -Answer and Explanation: The complementary DNA strand of the sequence ATGC will be TACG. The complementary base pairing in DNA is as per the Chargaff’s rules. According to these rules, purines always hydrogen bond with pyrimidines and vice-versa.

There is 1 question to complete.