2. it can be a double stranded DNA molecule or a twisted ladder.♀️ and i think 1. is covalent and hydrogen. (don’t worry, I googled)
A) Adenine and thymine Explanation: DNA has two types of nitrogenous bases: purines and pyrimidines. Adenine and guanine are purines while cytosine and thymine are pyrimidines. A purine always pairs with a pyrimidine. Thus, adenine associates DNA with thymine while guanine associates with cytosine. This is done to keep the width of the double helix constant along the entire length.
b Explanation:
Each nucleotide base can form hydrogen bonds with a specific partner base in a process known as complementary base pairing: cytosine forms three hydrogen bonds with guanine and adenine forms two hydrogen bonds with thymine. These hydrogen bonded nitrogenous bases are often referred to as base pairs.
Explanation: Chains of sugar phosphate chains with complementary nitrogen base pairs linked in a double helix
Answer 6
Adenine and thymine unite. Just remember ATCG in that order, showing that adenine and thymine bind, as do cytosine and guanine
That would be the first option. Adenine and thymine.
The first is correct. A always pairs with T and C always pairs with G
They form hydrogen bonds between opposite dna which form the twister ladder of dna