DNA Replication (Leaving Cert Biology): Flashcards
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State of chromosomes at end of mitosis
State of chromosomes at end of mitosis
Single-stranded
DNA replication definition
DNA replication definition
DNA making an exact copy of itself
Cell cycle stage when DNA replication occurs
Cell cycle stage when DNA replication occurs
Interphase
Location of DNA replication
Location of DNA replication
Nucleus
First step of DNA replication
First step of DNA replication
Double helix unwinds, exposing two DNA strands
What breaks hydrogen bonds between bases
What breaks hydrogen bonds between bases
An enzyme
Source of free DNA nucleotides during replication
Source of free DNA nucleotides during replication
Cytoplasm (they move into nucleus)
Base that pairs with adenine (A)
Base that pairs with adenine (A)
Thymine (T)
Base that pairs with cytosine (C)
Base that pairs with cytosine (C)
Guanine (G)
Role of DNA polymerase
Role of DNA polymerase
Assembles new strands by joining nucleotides
Type of enzyme DNA polymerase is
Type of enzyme DNA polymerase is
Anabolic enzyme
Composition of new DNA strands after replication
Composition of new DNA strands after replication
Half old DNA and half new DNA
Why DNA replication ensures cell continuity
Why DNA replication ensures cell continuity
All cells contain same genetic information
How DNA replication allows variation
How DNA replication allows variation
Occasional mistakes (mutations) create variation for evolution