DNA double helix does not have which of the following?Group of answer choicesthyminecomplementary base pairingparallel configurationmajor and minor grooves

To answer the question about what the DNA double helix does not have among the options given, let’s analyze each option:

1. Thymine: Thymine is one of the four nucleotide bases found in DNA. It is always paired with adenine. Therefore, DNA does have thymine.

2. Complementary Base Pairing: DNA molecules exhibit complementary base pairing, where adenine pairs with thymine and cytosine pairs with guanine. So, DNA does have complementary base pairing.

3. Parallel Configuration: The DNA double helix is structured in an antiparallel configuration, meaning the two strands run in opposite directions (5' to 3' on one strand and 3' to 5' on the other). Therefore, DNA does not have a parallel configuration.

4. Major and Minor Grooves: The double helix structure of DNA creates groove regions known as major and minor grooves. Therefore, DNA does have major and minor grooves.

Final Answer

The DNA double helix does not have a parallel configuration.