What are the two strands of nucleotides?
A DNA molecule is composed of two strands. Each strand is composed of nucleotides bonded together covalently between the phosphate group of one and the deoxyribose sugar of the next. From this backbone extend the bases. The bases of one strand bond to the bases of the second strand with hydrogen bonds.
What is a strand of nucleotides called?
2. Each DNA strand is composed of nucleotides—units made up of a sugar (deoxyribose), a phosphate group, and a nitrogenous base. Each strand of DNA is a polynucleotide composed of units called nucleotides.
What are the two strands of DNA called?
The DNA molecule consists of two strands that wind around one another to form a shape known as a double helix. Each strand has a backbone made of alternating sugar (deoxyribose) and phosphate groups.
How are 2 nucleotides linked together?
Nucleotides are joined together by covalent bonds between the phosphate group of one nucleotide and the third carbon atom of the pentose sugar in the next nucleotide. This produces an alternating backbone of sugar – phosphate – sugar – phosphate all along the polynucleotide chain.
What forms the rungs of the ladder?
The rungs of the ladder are pairs of 4 types of nitrogen bases. Two of the bases are purines- adenine and guanine. The pyrimidines are thymine and cytosine. The bases are known by their coded letters A, G, T, C.
What are the building blocks of DNA?
DNA is a molecule made up of four chemical bases: adenine (A), cytosine (C), guanine (G), and thymine (T). For the two strands of DNA to zip together, A pairs with T, and C pairs with G.
What are the 2 common parts of a nucleotide?
Answer
- a nitrogenous base.
- a five carbon sugar.
- at least one phosphate group.
What are the 2 common parts of a nucleotide Brainly?
A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen-containing base.
Are the 2 strands of DNA identical?
The replication process Hydrogen bonds break and helix opens. Each strand of DNA acts as a template for synthesis of a new, complementary strand. Replication produces two identical DNA double helices, each with one new and one old strand.
How are 2 strands of DNA held together?
The two strands are held together by hydrogen bonds between the bases, with adenine forming a base pair with thymine, and cytosine forming a base pair with guanine.
What parts of the nucleotides are connected to form a strand?
phosphodiester bond
When nucleotides are incorporated into DNA, adjacent nucleotides are linked by a phosphodiester bond: a covalent bond is formed between the 5′ phosphate group of one nucleotide and the 3′-OH group of another (see below). In this manner, each strand of DNA has a “backbone” of phosphate-sugar-phosphate-sugar-phosphate.