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Microbiology > Cell Cycle > Flashcards

Cell Cycle Flashcards

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Biology 101 flashcards
1
Q

What is the pathway usually taken to get 2 identical daughter cells

A

Binary fission

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2
Q

What is the genetic info composed of in bacterial cells

A

Single circular chromosome

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3
Q

Some cases some prokaryotes have 2 chormosomes what is an example

A

Vibrio cholerae

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4
Q

What does streptomyces have for their DNA

A

Linear chormosome act like a circular one

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5
Q

What is a replicon

A

Portion of chromosome which is able to initiate its own replication

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6
Q

What is the site of initiation

A

OriC origin

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7
Q

Where does termination occur

A

In 100Kb region

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8
Q

What is the period rom initiation to completion of replication

A

Time C (40 mins for ecoli)

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9
Q

What happens to ecoli bidirectional replication

A

Arrests in a termination trap

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10
Q

What is the D time

A

Time after replication to divide (20 mins for ecoli)

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11
Q

How does availability of DnaA protein affect chromosome replication

A

To initiate a new round of DNA replication enough DnaA-ATP has to bind to specific DNA sequences in origin

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12
Q

What do dedicated proteins do

A

Segregate the chromosomes

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13
Q

What do dynamic par proteins do

A

Segregate the chromosomes and plamsids

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14
Q

What is the central event of the cell division

A

The assembly of the FtsZ ring

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15
Q

What effect does FtsZ have on division

A

Controls it

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16
Q

What are the key proteins for cell division

A

FtsZ, FtsI, PBP3

17
Q

In production what happens

A

FtsI encodes PBP3 (penicillin binding protein)

18
Q

What is PBP3

A

Transmembrane protein which cross links peptide side chains

19
Q

What are some factors which are to be considered in prokaryotic growth

A 
Food 
Temperature
pH
Osmotic pressure 
Oxygen
20
Q

What is the bacterial cell cycle used for

A

New cell grows in size and splits into 2

21
Q

What is the FTsZ protein

A

First protien to move to site of division

Essential for recruiting other proteins that produce a new cell wall between dividing cell

22
Q

What si the septum

A

Partition that separates the cells of a divide prokaryote

23
Q

What forms the z ring and what does it do

A

Formed from smaller subunits of FtsZ

Filaments pull on each other and tighten to divide the cell

24
Q

What is binary fission

A

Method by which prokaryotic cells produce new individuals that are genetically identical to the parent organism

25
Q

Where is the origin of replication

A

Close to the binding site of the chromosome at the plasma mem

Microbiology (13 decks)

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