Answer:
1. Mitosis
2. Bases
3. Hydrogen
Explanation:
1. DNA replication occurs prior to meiosis and mitosis.
mitosis - cytokinesis - transcription
In cell division, DNA synthesis and replication is carried out during the S phase, in the interphase, a stage that occurs before mitosis and meiosis.
2. Adenine with Thymine and Cytosine with Guanine are known as the nitrogen bases in DNA.
bonds - bases - amino acids
Nucleic acids (DNA and RNA) are composed of nucleotides that contain nitrogenous bases:
DNA: adenine (A), guanine (G), thymine (T), and cytosine (C).
RNA: adenine (A), uracil (U), guanine (G), and cytosine (C).
3. Hydrogen bonds form and hold the DNA together.
hydrogen - peptide - polar
The complementary nitrogen bases are held together by hydrogen bonds:
A=T (adenine pairs with thymine)
C=G (cytosine pairs with guanine)
