Binary fission occurs; Replication of the circular DNA; Division of cytoplasm to produce 2 daughter cells; Each with single copy of circular DNA; and a variable number of plasmids
Describe how new viruses infect cells and are replicated
The virus's attachment protein binds to receptors on the cell surface membrane.
The viral nucleic acid enters the cell's cytoplasm
The viral DNA is replicated
the cell uses viral DNA to make viral proteins viral DNA and protein are used to assemble new viruses
The virus buds off wrapped in cell membrane which becomes its lipid envelope.
describe how viruses with RNA as their genetic material are produced
The virus's attachment protein binds to receptors on the cell surface membrane.
The virus enters the cell by endocytosis.
DNA copy made of viral RNA using reverse transcriptase;
The DNA is inserted into host DNA
the cell uses viral DNA to make viral proteins/particles;
and makes new viral DNA
The host cell makes new viruses;
The virus buds off wrapped in cell membrane which becomes its lipid envelope.
why can cancer cells grow rapidly
Mutations to DNA affect genes controlling cell division, accelerating the division of cells. Damaged cells usually get destroyed, but cancerous cells divide rapidly and form a tumour.
what can uncontrolled cell division lead to
the formation of tumours and cancers
how are cancer treatments targeted
Cancerous cells divide faster, cancer treatments target rapidly dividing cells and control the rate of cell division, therefore slowing the rate of growth of the tumour.
