Plant Genetics - Genetic Material Flashcards
Characteristics of Genetic Material
- Contains all necessary info
- Replicates accurately
- Capable of change
Genetic Materials consist of….
DNA - in all living organisms and some viruses
RNA - only in certain viruses
Chemical Composition of DNA and RNA
- Macromolecule (large)
- Polymeric (many similar smaller molecules or monomers) monomers=nucleotide
What are the “building blocks” of DNA?
Nucleotides
What are the 3 parts of nucleotides?
- Pentose (5-carbon) Sugar
- Nitrogenous Base (nitrogen containing)
- Phosphate group (PO4)
What is the difference between a DNA and RNA Pentose sugar?
RNA-Ribose (OH)
DNA-Deoxyribose (H)
What Nitrogenous Bases are present in DNA?
Adenine
Guanine
Thymine
Cytosine
What Nitrogenous Bases are present in RNA?
Adenine
Guanine
Uracil
Cytosine
What are purines?
Nitrogenous Bases that are…
Nine-membered
Double-ringed
2 Types: Adenine and Guanine
What are Pyrimidines?
Nitrogenous Bases that are…
Six-membered
Single-ringed
3 Types: Cytosine, Thymine (DNA), Uracil (RNA)
What makes up a Nucleoside?
1.Sugar
2. Base
3. Purines
What makes up a Nucleotides?
- Sugar
- Base
- Phosphate group
What is a polynucleotide?
A chain of nucleotides
5’-3’ polarity
What are Chargaff’s Rules?
- A/T=1 or G/C=1
- (A+T)/(G+C) Varies
- (A+G)/(C+T)=1
What 3 pieces of Info is the Watson-Crick model
- DNA molecule is a polynucleotide chain
- Chargaff’s Rule: Amount of A = Amount of T
and Amount of G = Amount of A - Atomic structure is helical with 2 distinct regularities along the axis of 0.34 nm and 3.4 nm