Question

Consider two DNA sequences: (A) ATTGAATA and (B) TCGCCAG. Correctly complete the following blanks for double-stranded DNA molecules having these sequences on one strand. "Sequence A has _______ hydrogen bonds with its complementary strand, and Sequence B has _______ hydrogen bonds with its complementary strand. Thus, the complementary strands of sequence _____ are held together more strongly due to its greater number of hydrogen bonds."

Answer 1

The correct option is option D which is 17;19; B.

Step-by-step explanation:

As the options are not given, the options are found online and are as below:

A)7;6;A

B)8;7;A

C)14;15'B

D)17;19;B

E)31;25;A

Out of the given options, the correct option is option D which indicates that the Sequence A has 17 Hydrogen bonds while Sequence B has 19 Hydrogen bonds. As H-bonds of sequence B are more so complementary strands of sequence B are held together strongly.

Answer 2

Sequence A has 17 hydrogen bonds with its complementary strand and sequence B has 19 hydrogen bonds with its complementary strand.

The strands in sequence B are held together more strongly.

Step-by-step explanation:

The complementary strands of sequence B, are held together more strongly because there are more hydrogen bonds in the sequence. Cytosine and Guanine bond together with 3 hydrogen bonds as opposed to Adenine and Thymine which bond with 2 hydrogen bonds.

The higher the number of bonds present, the stronger the bond and the more stable the sequence is. From the sequence, there is a higher C-G content in sequence B, indicating it has a stronger bond.