Biology Test Jan.16

The flashcards below were created by user t.allee on FreezingBlue Flashcards.

Mitosis
- -Cell creates 2 new identical cells
- -Original cell replicates/ copies DNA
- -Replace damaged/ old cells
Chromosomes
- -Form of DNA before cell division (packaged up)
- -DNA holds coded instructions for how we function & traits
DNA nucleotide
- -Subunits of DNA
- -Made up of phosphate, base, & sugar
DNA backbone

sugar covalently bonded to phosphate
Base pairing rule

Adenine h-bonds with thymine; guanine h-bonds with cytosine
Double helix

2 strands wound around each other; holds genetic information together
DNA replication
- -DNA replication: copying of DNA to make 2 identical DNA molecules
- -Weak h-bond: between base pairs ; weak; easily broken; strands separate to be copied
Cancer
- -Uncontrolled cell growth and division
- -Rapid cell production=tumor
DNA backbone vs double helix

Backbone made up of sugar covalently bonded to phosphates; creates 2 strands; provides structure and support for double helix
How are H-bonds & Covalent bonds used in a double helix?

H-bonds are used between bases; covalent bonds exist between the DNA backbone
What is the overall purpose of DNA in the body?

DNA is in our body because it contains instructions for functions and traits
What form does DNA take when not being used?

Chromosome
Chemical units that make up the structure DNA are?

Nucleotides
DNA backbone is made up of what molecules?
- -sugar
- -phosphate
How is DNA coded?

Coded by base pair rule; allows DNA to replicate/ copy itself
How many chromosomes in normal human cells?

46 chromosomes
Where are h-bonds located in a DNA molecule?

Between base pairs
How is it possible for DNA to make identical copies of itself?

Base pair rule

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t.allee

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Biology Test Jan.16

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Updated

2014-01-16T11:14:31Z

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