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Do bacteria reproduce asexually or sexually?
Bacteria reproduce asexually
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What method do bacteria use to reproduce?
Binary Fission
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What is binary fission? (4)
- The chromosome attaches to the plasma membrane and the DNA is replicated.
- The cell elongates and the two chromosomes separate.
- The cell wall grows to divide the cell in two.
- Two identical daughter cells are formed.
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In binary fission, what is the first step?
The chromosome attaches to the plasma membrane and the DNA is replicated.
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In binary fission, what happens after the dna is replicated?
The cell elongates and the two chromosomes separate.
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In binary fission, what grows to divide the cell in two?
The cell wall grows to divide the cell two
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By binary fission, what is formed?
Two identical daughter cells are formed.
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Have bacteria a long/short lifecycle?
Bacteria have a very short lifecycle (reproduce every 20 min).
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How fast can some bacteria reproduce?
Some can reproduce every 20 min.
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What 3 labels do you need in the binary fission diagram?
- Cell wall
- Ring of DNA
- Cytoplasm
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How do bacteria evolve to resist to new antibiotics?
Reproduce quickly, new mutations can spread rapidly - this is how bacteria evolve resistance to new antibiotics.
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What is a mutation?
Change in genetic makeup of the cell.
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Describe the formation of endospores? (5)
- Some bacteria can withstand unfavourable conditions by producing endospores.
- These are formed when the bacterial chromosome replicates.
- One of the new strands becomes enclosed in a tough walled capsule called an endospore.
- The parent cell then breaks down and the endospore remains dormant.
- When conditions are favourable again the spores absorb water, break their walls and reproduce by binary fission.
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When do some bacteria produce endospores?
In unfavourable conditions
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What replicates when an endospore is formed?
When the bacterial chromosome replicates.
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What does one of the new strands become enclosed by in the formation of an endospore?
A tough walled capsule called an endospore.
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What breaks down as the endospore remains dormant?
The parent cell breaks down and the endospore remains dormant.
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What happens to endospores when conditions become favourable again?
The spores absorb water, break their walls and reproduce by binary fission.
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