Structure of DNA

Key area 1

Name the units of DNA

Nucleotide

What types of bond formed between bases

hydrogen bonds

Name the protein the help stores chromosomes inside a nucleus

Histones

Why is yeast considered a special example of a eukaryotic

It contains plasmids

Name given to additional DNA mainly found in bacteria cells

Plasmids

Why is yeast considered a special example of a eukaryotic

It contains plasmids

A DNA nucleotide contains three components.

State the three components

Deoxyribose sugar, phosphate, base

Name the type of bond that holds the paired bases together

Weak hydrogen bonds

State the role of DNA ligase during DNA replication

Joins fragments together in the lagging strand

State the role of the DNA polymerase during DNA replication

Adds complimentary nucleotides in a 5’ to 3’ direction

Name the molecule present at the 5’ ends of a DNA strand

Phosphate

State the type of bonds that joins complementary bases between the two strands of DNA

Hydrogen

State the role of DNA ligase during DNA replication

Joins the fragments together in the lagging strand

State two features of the organisation of DNA in a prokaryotic cell

Single circular chromosomes in the cytoplasm and additional circular DNA call plasmids

What are the examples of the cells in PROKARYOTIC

Bacteria

What are the examples of the cells in EUKARYOTIC

Plant, animal and fungal

Compare one different in the organisation of DNA in prokaryotic and eukaryotic cells

Eukaryotes have a linear chromosomes whereas prokaryotes have a single circular chromosome