Chromosomes, DNA and Nucleotides Flashcards
1
Q
What are the base pairs
A
Nitrogenous bases held together by hydrogen bonds
- A T binds with 2 Hydrogen
- G C binds with 3 hydrogen
2
Q
Define chromatin
A
DNA and the proteins and RNA needed to package DNA into cell nucleus
- loose - beads on a string
- tight - chromosome
3
Q
Genome
A
Total genetic content of an organism
- in diploid organisms the DNA sequence of spine set of chromosomes
4
Q
What is the difference between nucleoside and nucleotide
A
Both are nitrogenous base and pentode sugar but nucleotide is the only one with a phosphate
5
Q
Define Nucleosome
A
Basic repeat unit of eukaryotic chromatin - a bead like structure formed by DNA wrapped around histones
6
Q
What are;
Purine
Purimidine
A
Purine / two-ring nitrogenous base (G C)
Purimidines / one-ring nitrogenous base (C T U)
7
Q
What is a base
A
Nitrogenous base is a component of nucleic acid involved in base pairing - guanine, adenine, thymine, cytosine and uracil
