Answer:
1. Mitosis
2. Bases
3. Hydrogen
Explanation:
1. DNA replication occurs prior to meiosis and <u>mitosis</u>.
<em>mitosis - cytokinesis - transcription</em>
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 <u>bases</u> in DNA.
<em>bonds - bases - amino acids</em>
Nucleic acids (DNA and RNA) are composed of nucleotides that contain nitrogenous bases:
<em>DNA: adenine (A), guanine (G), thymine (T), and cytosine (C).</em>
RNA: <em>adenine (A), uracil (U), guanine (G), and cytosine (C).</em>
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3. <u>Hydrogen</u> bonds form and hold the DNA together.
<em>hydrogen - peptide - polar</em>
The complementary nitrogen bases are held together by hydrogen bonds:
<em>A=T (adenine pairs with thymine)</em>
<em>C=G (cytosine pairs with guanine)</em>
