DNA and Chromosomes Flashcards
DNA
Is a long polymer made of 4 nucleotides
A DNA molecule has two ________ strands of nucleotides
Compenmentary
Nucleotides are made up of what?
A sugar attached to a phosphate group which makes the sugar -phosphate backbone & also the 4 different types of bases
What are the 4 different types of bases?
- Adenine (A)
- Cytosine (C)
- Guanine (G)
- Thymine (T)
Nucleotides are the sugar-phosphate & the different types of bases but since the sugar-phosphate backbone is the same & the only thing that changes is _______ we just refer to nucleotides to the _______
Bases
Nucleotides(bases) are connected by ________ between the 5’ end of one sugar and the 3’ end of another
Phosphodiester Bonds
The end with a hole on the DNA strand is the _________
3’ hydroxyl end
The end with a knobe on the DNA strand is the ______
5’ phosphate end
________ holds the nucleotides (base-pairs ) together
Hydrogen Bonds
A pairs with what base?
T & U
C pairs with what base
G
The ______ of DNA provides a way for heredity
Structure
_______ organize & carry the nucleotide sequences (genetic information)
Chromosomes (Main function is to carry genes)
The _________ within a DNA strand encodes the genetic information in an organism (Like a 4 letter alphabet with different messages)
Nucleotide sequence
Since genes contains instructions for producing protiens the _________ in DNA must be able to form the amino acid sequence in proteins (Central Dogma)
Nucleotide Sequence
Genetic Code
The relationship between the nucleotide sequence & the amino acid sequence
In eukaryotic cells DNA is packed into ________ which fits into the nucleus
Chromosomes
Eukaryotic DNA is packed into _________
Multiple chromosomes (where DNA is disturbed into different chromomses; the human nucleus has 23 different chromomses & 46 all together)
Chromatin
The DNA molecule that is folded by proteins in the chromosome
Karyotype
An organize display of the full 46 chromosomes in humans
Genes
A segment or piece of DNA molecule that contains nucleotide sequence(instructions) to produce certain types of RNA & proteins (Central Dogma)
Genome
The total nucleotide sequence(DNA molecules) carried by a complete set of chromosmes in a cell
Junk DNA
Additional specific nucleotide sequences required for normal gene expression (Non coding DNA)
______________ are required for DNA replication & chromosome segration
Specialized DNA sequences