To determine which statement is not true about DNA, let’s evaluate each one:
- a. It has the structure of a double helix: This statement is true. DNA is well-known for its double helix structure, which consists of two strands twisted around each other.
- b. Bases between the two strands are held together by hydrogen bonds: This statement is also true. The nitrogenous bases (adenine, thymine, cytosine, and guanine) pair up across the two strands of the helix and are connected by hydrogen bonds.
- c. Bases are complementary to each other: This statement is true as well. In DNA, adenine pairs with thymine and cytosine pairs with guanine, meaning the bases are complementary to each other.
- d. DNA incorporates a deoxyribose sugar: This statement is true. The sugar present in the DNA backbone is deoxyribose, which differentiates it from RNA that uses ribose.
- e. DNA conta: This statement is incomplete and does not provide enough information to determine if it’s true or false. Due to the lack of context, it is reasonable to conclude that this statement is likely not true as it does not accurately describe any aspect of DNA.
Based on this analysis, the statement that is not true about DNA is option e, as it is incomplete.