17. DNA replication Flashcards
The genetic material of which kind of cells is included in a single circular molecule of DNA?
Bacteria yoooo
Two sides of double helix structure of DNA are held together with hydrogen bonds
True beans
What statement about DNA is false?The two strands are separated.
Each strand is used as a template for making a new duplex.
The synthesis on each strand is in the opposite direction.
The newly synthesized DNA is packaged into one nucleus, and the old DNA is packaged into another nucleus.
The newly synthesized DNA is packaged into one nucleus, and the old DNA is packaged into another nucleus.
In rep of DNA, the helix is opened and untwisted by
helicase
Since the first nucleotid s cannot be linked In a newly synthesised strand in DNA replication what is required??
RNA primer
Enzyme that catalysed new DNA molecules
DNA polymerase
True statement about the elongation of the lagging strand during DNA replication
Synthesised discontinuouslyokazaki fragments are used to elongate LAGGING strand
What joins DNA FRAGMENTS to the lagging strands??
Ligases
DNA is found
In greatest quantities in nucleus of cells
- Which statement about the elongation of the lagging strand during DNA replication is correct?It is synthesized in a 3’ –> 5’ direction.It requires one RNA primer to proceed.It is synthesized by DNA ligase.It is synthesized discontinuously.
It is synthesized discontinuously
- Okazaki fragments are used to elongate
the lagging strand
When is DNA replicated in cell cycle??
Interphase, preparing for cell division
DNA shape in prokaryotic and eukaryotic cells
PRO- circular
EUKARYOTIC: linear
What is principle difference in DNA replication between prokaryotic and eukaryotic cells in terms of replication fork???
PROKARYOTIC- 1 replication fork ( 1 origin)
ETIC: multiple replication fork ( +1 origin)
What is function of topoisomerase??
Alters the supercooled DNASE ahead of replication fork
