Select the incorrect statement for structure of B-DNA.a)The base pair...
Incorrect Statement for Structure of B-DNA:
Explanation:
The structure of B-DNA refers to the most common and stable form of DNA. It is a right-handed double helix structure that consists of two anti-parallel polynucleotide strands. The incorrect statement for the structure of B-DNA is:
a) The base pairs in DNA are stacked 3.4 Å apart
This statement is correct. In B-DNA, the base pairs are stacked 3.4 Å (angstroms) apart along the helical axis. This stacking of base pairs contributes to the stability of the DNA double helix.
b) Two full turns of the helical strand would involve twenty base pairs
This statement is correct. In B-DNA, each complete turn of the helix involves approximately 10 base pairs. Therefore, two full turns would involve twenty base pairs.
c) All base pairs consist of one purine and one pyrimidine
This statement is correct. Base pairing in DNA follows the complementary base pairing rule, where adenine (purine) always pairs with thymine (pyrimidine), and cytosine (pyrimidine) always pairs with guanine (purine).
d) Glycosidic bond is responsible for the formation of the backbone
This statement is incorrect. The glycosidic bond is not responsible for the formation of the backbone of DNA. The backbone of DNA is formed by the sugar-phosphate backbone, which consists of the alternating deoxyribose sugar and phosphate groups. The glycosidic bond, on the other hand, connects the nitrogenous base to the sugar molecule within each nucleotide.
In summary, option D is the incorrect statement for the structure of B-DNA because the glycosidic bond is not responsible for the formation of the backbone.
Select the incorrect statement for structure of B-DNA.a)The base pair...
The backbone is formed of sugar and phosphate, so ester bond is present in backbone.
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