![]() |
Erstellt von Charlotte Hewson
vor mehr als 9 Jahre
|
|
Frage | Antworten |
what is adaptation? | through the process of natural selection, organisms adjust to suit the changing environment in which they live |
what is one of the most diverse and adaptable groups of organisms? | bacteria |
what is this ability shown through? | their ability to develop resistance to antibiotics |
where does diversity in organisms come from? | changes to its DNA |
what 2 ways do these changes occur? | -changing quaternary structure of its DNA (mutation) -recombining existing DNA of 2 individuals. occurs during sexual reproduction |
what is one other way diversity can be increased? | conjugation |
what is conjugation? | the recomobination of DNA of 2 individuals, yet not strictly sexual reproduction |
what are mutations? | changes in DNA that result in different characteristics |
what is an example of how a mutation may arise? | one or more bases may be added, deleted or replaced during replication. |
what may this result in? | a different sequence of amino acids, which will cause a different polypeptide and hence a different protein, or no protein at all |
what would disrups metabolic pathway? | if this protein was an enzyme |
when does conjugation occur? | when one bacterial cell transfers DNA to another bacterial cell |
what happens at stage 1? | conjugation tube forms |
what happens at stage 2? | plasmid of donor cell starts to replicate |
what is the 3rd stage? | replicated plasmid starts to move through conjugation tube |
what happens at stage 5? | linear strand enters recipient cell |
what happens in the final stage? | linear strand forms a circle - new plasmid |
what are the two types of gene transmission? | horizontal and vertical |
what is horizontal gene transmission? | in conjugation, DNA in the form of genes can be passed from one species to another species |
what is vertical gene transmission? | genes are passed down from one species to the next generation of the same species |
Möchten Sie mit GoConqr kostenlos Ihre eigenen Karteikarten erstellen? Mehr erfahren.