2.2 Cell Growth and Reproduction

2.2 Cell Growth and Reproduction - Cell Growth and...

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Cell Growth and Reproduction
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DNA Structure Nucleotides Double helix Two strands twisted together Rungs – nitrogen containing bases Sides – alternating sugar and phosphate groups
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DNA Replication Semiconservative replication Every DNA molecule is half “old” and half “new” DNA strand acts as template Process Helicase enzyme – unwinds
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DNA replication – Base Pairing Nucleotides come in – combine with existing nucleotides
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Joining Nucleotides Leading strand: DNA polymerase III joins individual nucleotides Lagging strand: DNA ligase splices short groups of nucleotides- together DNA polymerase and DNA ligase repair mistakes Results – two DNA molecules Half old, half new
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Cell cycle Interphase – not undergoing division Sub-stages • G 1 (Gap 1) S (Synthesis) • G 2 (Gap 2) • G 0 Mitosis
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Mitosis Functions Growth- increasing in number Repair tissue- skin, ex. scar Cell replacement- replace lining in stomach every 3 days
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2.2 Cell Growth and Reproduction - Cell Growth and...

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