BIOL140 Lecture 4: Biol 140 Lecture Four

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21 Jun 2016
Department
Course
Professor
BIO Lecture #4
September 22, 2015
Deoxyribose Nucleic Acid
Storage mechanism for genetic information
Instructions for cell functioning and replication
DNA
RNA
Nucleic Acids
Phosphate
Deoxyribose
Ribose*
Sugar
Adenine
Guanine
Cytosine
Thymine
Uracil*
Nitrogen containing compound
Nucleotide Base
Contains
Nucleotide Structures
A)
Double- Two strands of nucleotides
Helix- Corkscrew/spiral shape
Double Helix
A T (Two bonds)
C G (Three Bonds)
A U* (Two Bonds)
There are chemical rules of pairing between bases
Complementary Base Pairing
DNA Structure
B)
Molecule Structure
RNA Only
*
Nucleic Acids
1.
Lipids
2.
Proteins
3.
Carbohydrates
4.
Four Groups of Macromolecules
Humans have some total amount of base pairs
Total amount of DNA is NOT one long molecule
46 chromosomes
Homologous means the same
23 homologous pairs
It is divided into pieces
Each species has a different amount of chromosomes
Same number of base pairs
Same length
1.
Centromeres are in the same location
2.
Same banding pattern
3.
Ex. Eye colour
Genes for the same traits are in the same location
4.
Four Traits of Homologous pairs
Chromosomes
I.
Definition
A.
Life cycle of the cell from when it is formed to when it divides
The amount of time a cell spends in each stage depends
on the cell type
Cells pass through stages
Non-dividing
Functioning
DNA Replication
Prep for division
Some cells remain permanently in interphase
G1
1)
Interphase
i.
Phases
B.
Cell cycle
II.
Chromosome and Cell Cycle
Homologous Pairs
Same number of base pairs
Same length
In the same
location
Centromere
Same banding
pattern
Genes for the same trait are
in the same location
Ex. Eye colour
Lecture Four
September 22, 2015
10:09 PM
BIO 140 Page 1
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